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Naponska i strujna referenca i 16bit ADC

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Naponska i strujna referenca i 16bit ADC
savan Offline
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#1
06-14-2023, 07:57 PM (This post was last modified: 06-14-2023, 08:02 PM by savan.)
Vec neko vreme gledam da napravim ovakav uredjaj https://essentialscrap.com/vref/ , prvi pcb nije uspeo, danas mi je stigao drugi pcb i odmah sam ga polemio i na kratko probao, za sada nisam odradio neka precizna merenja jer nemam sa cime, onako na prvu unimerom mereno izmedju tacke gndref i vref imam tacno 2.048V i izmedju tacke +5Vout i IREF tacno 2.048mA, deluje sasvim stabilno i ok, jednom kada budem imao vremena cu pogledati kako izgleda mereno na ADC, temu sam otvorio pa kako kome ovo bude interesantno. Dimenzija pcb je 29x57mm. Napaja se preko usb, litijumskom baterijom. R4 je precizni otpornik 1k (0.01%) 71-Z201T1K0000TB, dole je bom, gerber, easyeda projekt source code, sve potrebno za izradu. Pinovi su trnovi 1mm. Mogucnosti su svakakve jer uz ove dve reference postoji 16bit-ni adc sa izolovanim i2c pa moze da se spaja na neki eksterni kontrolni uredjaj na primer raspberry pi.

[Image: attachment.php?aid=40434]


Attached Files Thumbnail(s)


.zip   gerber_bom.zip (Size: 388,92 KB / Downloads: 0)
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savan Offline
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#2
06-15-2023, 02:25 PM (This post was last modified: 06-15-2023, 02:32 PM by savan.)
Prvi rezultati naponske reference izmereni preko ADC sa ove plocice : )

Code:
root@LEDErpi /overlay # ./max raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffc , Volts=2.047563 raw=0x3ffc , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffa , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffc , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffc , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffb , Volts=2.047563 raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437 raw=0x3ffb , Volts=2.047437


Attached Files
.c   adc.c (Size: 10,19 KB / Downloads: 3)
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savan Offline
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#3
06-15-2023, 03:29 PM (This post was last modified: 06-15-2023, 05:29 PM by savan.)
Mozda formula nije bas najbolja ali pokusao sam da izmerim otpornik od 220 ohm, u adc na A1 kanal merim napon baterije a U kanalu A0 napon na donjem kraju otpornika gde nam je poznat Iref, struja je poznata i ona prati naponsku referencu znaci 2.0474mA konstantno, otpornik je spojen izmedju +5V baterije i Iref, i finalno furmula bi trebala da glasi ako ne gresim:

(naponbaterije - naponnaotporniku) / Iref

rezultat i nije tako los:
Code:
batteryVolts=5.153220 , dropVolts=4.706206 , ohms=218.328270 batteryVolts=5.151720 , dropVolts=4.704706 , ohms=218.328270 batteryVolts=5.152845 , dropVolts=4.705081 , ohms=218.694846 batteryVolts=5.152282 , dropVolts=4.704706 , ohms=218.603086 batteryVolts=5.151720 , dropVolts=4.704331 , ohms=218.511558 batteryVolts=5.152470 , dropVolts=4.705268 , ohms=218.420030 batteryVolts=5.152282 , dropVolts=4.704519 , ohms=218.694613 batteryVolts=5.152282 , dropVolts=4.704331 , ohms=218.786374 batteryVolts=5.152095 , dropVolts=4.704894 , ohms=218.420030 batteryVolts=5.152282 , dropVolts=4.705268 , ohms=218.328503 batteryVolts=5.152282 , dropVolts=4.704706 , ohms=218.603086 batteryVolts=5.152470 , dropVolts=4.705081 , ohms=218.511558 batteryVolts=5.151907 , dropVolts=4.704706 , ohms=218.420030 batteryVolts=5.151720 , dropVolts=4.704331 , ohms=218.511558 batteryVolts=5.152470 , dropVolts=4.705268 , ohms=218.420030 batteryVolts=5.152282 , dropVolts=4.705081 , ohms=218.420030 batteryVolts=5.152470 , dropVolts=4.705081 , ohms=218.511558 batteryVolts=5.151907 , dropVolts=4.704706 , ohms=218.420030 batteryVolts=5.150970 , dropVolts=4.704706 , ohms=217.961927 batteryVolts=5.151907 , dropVolts=4.704894 , ohms=218.328503 batteryVolts=5.152657 , dropVolts=4.705456 , ohms=218.419798 batteryVolts=5.153407 , dropVolts=4.706394 , ohms=218.328270 batteryVolts=5.153220 , dropVolts=4.706206 , ohms=218.328270 batteryVolts=5.153032 , dropVolts=4.706394 , ohms=218.145215 batteryVolts=5.153595 , dropVolts=4.706018 , ohms=218.603319 batteryVolts=5.152657 , dropVolts=4.705081 , ohms=218.603086 batteryVolts=5.153595 , dropVolts=4.705644 , ohms=218.786374 batteryVolts=5.152470 , dropVolts=4.705831 , ohms=218.145215 batteryVolts=5.152282 , dropVolts=4.704706 , ohms=218.603086 batteryVolts=5.152095 , dropVolts=4.706394 , ohms=217.687344 batteryVolts=5.152470 , dropVolts=4.705831 , ohms=218.145215 batteryVolts=5.151720 , dropVolts=4.705268 , ohms=218.053687 batteryVolts=5.153032 , dropVolts=4.705268 , ohms=218.694846 batteryVolts=5.152845 , dropVolts=4.705831 , ohms=218.328503 batteryVolts=5.153032 , dropVolts=4.705831 , ohms=218.420030 batteryVolts=5.151907 , dropVolts=4.705456 , ohms=218.053687 batteryVolts=5.152657 , dropVolts=4.704894 , ohms=218.694613 batteryVolts=5.152470 , dropVolts=4.705268 , ohms=218.420030 batteryVolts=5.151532 , dropVolts=4.705268 , ohms=217.962160 batteryVolts=5.151907 , dropVolts=4.704894 , ohms=218.328503 batteryVolts=5.152095 , dropVolts=4.705268 , ohms=218.236975 batteryVolts=5.153032 , dropVolts=4.705644 , ohms=218.511558 batteryVolts=5.151907 , dropVolts=4.704706 , ohms=218.420030 batteryVolts=5.152095 , dropVolts=4.705268 , ohms=218.236975 batteryVolts=5.152657 , dropVolts=4.705644 , ohms=218.328270 batteryVolts=5.151907 , dropVolts=4.704706 , ohms=218.420030 batteryVolts=5.151907 , dropVolts=4.705268 , ohms=218.145448 batteryVolts=5.153032 , dropVolts=4.705456 , ohms=218.603086 batteryVolts=5.151345 , dropVolts=4.704519 , ohms=218.236742 batteryVolts=5.153032 , dropVolts=4.706018 , ohms=218.328503 batteryVolts=5.152095 , dropVolts=4.704894 , ohms=218.420030 batteryVolts=5.152470 , dropVolts=4.705081 , ohms=218.511558 batteryVolts=5.152470 , dropVolts=4.705644 , ohms=218.236742 batteryVolts=5.153782 , dropVolts=4.706769 , ohms=218.328503 batteryVolts=5.152845 , dropVolts=4.705456 , ohms=218.511558 batteryVolts=5.153407 , dropVolts=4.706206 , ohms=218.419798 batteryVolts=5.152657 , dropVolts=4.705831 , ohms=218.236742 batteryVolts=5.153407 , dropVolts=4.706018 , ohms=218.511558 batteryVolts=5.153220 , dropVolts=4.706018 , ohms=218.420030 batteryVolts=5.153595 , dropVolts=4.706394 , ohms=218.420030 batteryVolts=5.152282 , dropVolts=4.704894 , ohms=218.511558 batteryVolts=5.152657 , dropVolts=4.705456 , ohms=218.419798 batteryVolts=5.152657 , dropVolts=4.705831 , ohms=218.236742 batteryVolts=5.153595 , dropVolts=4.706018 , ohms=218.603319 batteryVolts=5.152845 , dropVolts=4.705831 , ohms=218.328503 batteryVolts=5.152845 , dropVolts=4.704706 , ohms=218.877901 batteryVolts=5.153407 , dropVolts=4.705268 , ohms=218.877901 batteryVolts=5.154532 , dropVolts=4.706581 , ohms=218.786374 batteryVolts=5.152095 , dropVolts=4.704519 , ohms=218.603086 batteryVolts=5.152282 , dropVolts=4.705456 , ohms=218.236742 batteryVolts=5.152845 , dropVolts=4.705456 , ohms=218.511558 batteryVolts=5.153407 , dropVolts=4.706206 , ohms=218.419798 batteryVolts=5.152470 , dropVolts=4.705831 , ohms=218.145215 batteryVolts=5.151532 , dropVolts=4.705456 , ohms=217.870399 batteryVolts=5.152095 , dropVolts=4.704894 , ohms=218.420030 batteryVolts=5.153032 , dropVolts=4.705268 , ohms=218.694846 batteryVolts=5.153032 , dropVolts=4.705644 , ohms=218.511558 batteryVolts=5.153220 , dropVolts=4.705456 , ohms=218.694613 batteryVolts=5.151720 , dropVolts=4.704706 , ohms=218.328270 batteryVolts=5.153407 , dropVolts=4.705831 , ohms=218.603086 batteryVolts=5.153032 , dropVolts=4.706206 , ohms=218.236742 batteryVolts=5.153595 , dropVolts=4.705268 , ohms=218.969662 batteryVolts=5.152845 , dropVolts=4.705644 , ohms=218.420030 batteryVolts=5.152657 , dropVolts=4.705268 , ohms=218.511558 batteryVolts=5.152657 , dropVolts=4.705831 , ohms=218.236742 batteryVolts=5.153407 , dropVolts=4.706394 , ohms=218.328270 batteryVolts=5.153595 , dropVolts=4.706206 , ohms=218.511558 batteryVolts=5.152095 , dropVolts=4.704894 , ohms=218.420030 batteryVolts=5.152845 , dropVolts=4.704894 , ohms=218.786374 batteryVolts=5.152470 , dropVolts=4.704894 , ohms=218.603086 batteryVolts=5.153220 , dropVolts=4.706018 , ohms=218.420030 batteryVolts=5.152470 , dropVolts=4.704706 , ohms=218.694613 batteryVolts=5.153032 , dropVolts=4.705831 , ohms=218.420030 batteryVolts=5.152470 , dropVolts=4.705268 , ohms=218.420030 batteryVolts=5.153407 , dropVolts=4.705831 , ohms=218.603086 batteryVolts=5.152470 , dropVolts=4.705268 , ohms=218.420030 batteryVolts=5.153032 , dropVolts=4.705268 , ohms=218.694846 batteryVolts=5.153407 , dropVolts=4.705081 , ohms=218.969429 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Rezultat i nije tako los sa obzirom da je na istoj bateriji spojen i raspberry pi zero w i to verovatno daje neku nestabilnost. Ovo bi moglo da se zbroji i podeli na broj uzoraka, recimo na broj uzoraka u sekundi i da se dobije osrednja vrednost otpornika sto i nije los rezultat. Imamo i jos dva kanala slobodna na ADC na koji bi mogli direktno da zakacimo Vref i da ujedno imamo i tu vrednost koju prati Iref tako da na svakom samplu imamo poznate i te vrednosti za jos bolji rezultat.

Edit:
Ovaj program dole, doradio sam ga dodavanjem merenja u 50 semplova, u svakom semplu meri sve vrednosti pre nego prodju kroz formulu za izracunavanje otpornosti otpornika. Direktno meri napon baterije, pad napona na otporniku i Vref. Nisam ga probao jer sam rastavio sklop trenutno pa cu probati jednom kada budem ponovo spojio za probu, bi trebalo da izmeri prilicno tacnu vrecnost otpornika, na IN2 je spojen vref, na IN0 donji kraj otpornika + Iref, na IN1 gornji kraj otpornika + (+5V), rezultat 50 semplova se zbraja i na kraju deli sa 50, to bi trebalo da daje tacnu vrednost otpornika. Zamisao ove sprave je bila da se njome radi precizno uparivanje otpornika vrednosti do 2.5k ohm, dali sam uspeo ne znam jos uvek, mislim da jesam? Revizija bi trebala da bude dodavanje preklopnika za izbor R4 ref otpornika od kojeg nam zavisi strujna referenca od koje direktno zavisi i range merenog otpornika. I dodavanje mcu po izboru kao i displeja. Takodje skutijavanje uredjaja uz dodavanje litium baterije sa svojim sklopom za punjenje. Bilo bi odlicno da se pribave kelvin pipalice pa tako da se modifikuje i doradi shema i pcb sa svim ovim osobinama koje sam nabrojao, mislim da bi moglo sve skupa da kosta u okvirima $100 a da bude vrlo korektan namenski uredjaj? Ako ste zainteresovani mozemo zajedno da reviziramo ovakav jedan uredjaj uz vase predloge i sugestije!


Attached Files
.c   ref.c (Size: 11,06 KB / Downloads: 8)
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savan Offline
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#4
06-16-2023, 02:05 PM (This post was last modified: 06-16-2023, 02:13 PM by savan.)
Rezultat gornjeg programa sa 50 semplova u nekoliko ponovljenih puta, ima nekih nestabilnosti verovatno preko ovih zica, do baterije ili sta vec ali nije lose za pocetak
Code:
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Code:
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Code:
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iref=0.002047 , ohms=218.976059 batteryVolts=5.231035 , dropVolts=4.783083 , iref=0.002047 , ohms=218.792984 batteryVolts=5.229722 , dropVolts=4.782521 , iref=0.002047 , ohms=218.426636 batteryVolts=5.231410 , dropVolts=4.782521 , iref=0.002047 , ohms=219.250870 batteryVolts=5.230659 , dropVolts=4.782709 , iref=0.002047 , ohms=218.792755 batteryVolts=5.230847 , dropVolts=4.782521 , iref=0.002048 , ohms=218.956238 batteryVolts=5.231035 , dropVolts=4.782709 , iref=0.002047 , ohms=218.976059 batteryVolts=5.231597 , dropVolts=4.782709 , iref=0.002048 , ohms=219.230576 batteryVolts=5.231972 , dropVolts=4.783459 , iref=0.002048 , ohms=219.047531 batteryVolts=5.231597 , dropVolts=4.783083 , iref=0.002048 , ohms=219.047531 batteryVolts=5.231597 , dropVolts=4.783083 , iref=0.002048 , ohms=219.047531 batteryVolts=5.231785 , dropVolts=4.783646 , iref=0.002048 , ohms=218.864487 batteryVolts=5.231597 , dropVolts=4.782896 , iref=0.002047 , ohms=219.159119 batteryVolts=5.231410 , dropVolts=4.783083 , iref=0.002047 , ohms=218.976059 batteryVolts=5.231035 , dropVolts=4.782709 , iref=0.002047 , ohms=218.976059 batteryVolts=5.230847 , dropVolts=4.782521 , iref=0.002047 , ohms=218.976288 batteryVolts=5.230472 , dropVolts=4.782896 , iref=0.002047 , ohms=218.609695 batteryVolts=5.230659 , dropVolts=4.782333 , iref=0.002048 , ohms=218.956009 batteryVolts=5.230472 , dropVolts=4.782333 , iref=0.002047 , ohms=218.884521 batteryVolts=5.231222 , dropVolts=4.782896 , iref=0.002048 , ohms=218.956009 batteryVolts=5.231035 , dropVolts=4.782333 , iref=0.002048 , ohms=219.139282 batteryVolts=5.230097 , dropVolts=4.782521 , iref=0.002047 , ohms=218.609924 batteryVolts=5.230847 , dropVolts=4.782521 , iref=0.002047 , ohms=218.976288 batteryVolts=5.230472 , dropVolts=4.782521 , iref=0.002048 , ohms=218.772964 batteryVolts=5.231410 , dropVolts=4.782521 , iref=0.002048 , ohms=219.230804 batteryVolts=5.231035 , dropVolts=4.782333 , iref=0.002048 , ohms=219.139282 batteryVolts=5.231410 , dropVolts=4.782709 , iref=0.002048 , ohms=219.139053 batteryVolts=5.230659 , dropVolts=4.782521 , iref=0.002047 , ohms=218.884521 batteryVolts=5.230472 , dropVolts=4.782521 , iref=0.002047 , ohms=218.792984 batteryVolts=5.231785 , dropVolts=4.783083 , iref=0.002047 , ohms=219.159348 batteryVolts=5.231410 , dropVolts=4.782896 , iref=0.002047 , ohms=219.067581 batteryVolts=5.231222 , dropVolts=4.782709 , iref=0.002047 , ohms=219.067581 batteryVolts=5.230847 , dropVolts=4.781771 , iref=0.002047 , ohms=219.342636 batteryVolts=5.230097 , dropVolts=4.782521 , iref=0.002047 , ohms=218.609924 batteryVolts=5.231035 , dropVolts=4.783083 , iref=0.002047 , ohms=218.792984 batteryVolts=5.230847 , dropVolts=4.782333 , iref=0.002048 , ohms=219.047760 batteryVolts=5.231222 , dropVolts=4.782521 , iref=0.002048 , ohms=219.139282 batteryVolts=5.230659 , dropVolts=4.782896 , iref=0.002048 , ohms=218.681213 batteryVolts=5.230659 , dropVolts=4.782146 , iref=0.002047 , ohms=219.067581 batteryVolts=5.230847 , dropVolts=4.782146 , iref=0.002047 , ohms=219.159348 batteryVolts=5.230472 , dropVolts=4.782521 , iref=0.002048 , ohms=218.772964 batteryVolts=5.229909 , dropVolts=4.781583 , iref=0.002047 , ohms=218.976059 batteryVolts=5.230659 , dropVolts=4.782146 , iref=0.002047 , ohms=219.067581 batteryVolts=5.231035 , dropVolts=4.782896 , iref=0.002047 , ohms=218.884521 batteryVolts=5.231222 , dropVolts=4.783459 , iref=0.002047 , ohms=218.701233 batteryVolts=5.230847 , dropVolts=4.783083 , iref=0.002047 , ohms=218.701462 batteryVolts=5.231035 , dropVolts=4.782896 , iref=0.002047 , ohms=218.884521 batteryVolts=5.231222 , dropVolts=4.782709 , iref=0.002047 , ohms=219.067581 batteryVolts=5.231410 , dropVolts=4.783083 , iref=0.002047 , ohms=218.976059 batteryVolts=5.230847 , dropVolts=4.783271 , iref=0.002047 , ohms=218.609924 batteryVolts=5.231410 , dropVolts=4.782896 , iref=0.002047 , ohms=219.067581 batteryVolts=5.230659 , dropVolts=4.783271 , iref=0.002047 , ohms=218.518173 batteryVolts=5.230659 , dropVolts=4.782896 , iref=0.002047 , ohms=218.701233 batteryVolts=5.230847 , dropVolts=4.783459 , iref=0.002047 , ohms=218.518173 batteryVolts=5.231222 , dropVolts=4.782521 , iref=0.002047 , ohms=219.159348 batteryVolts=5.231222 , dropVolts=4.783646 , iref=0.002048 , ohms=218.589691 batteryVolts=5.230285 , dropVolts=4.782521 , iref=0.002047 , ohms=218.701462 batteryVolts=5.231410 , dropVolts=4.782146 , iref=0.002047 , ohms=219.433929 batteryVolts=5.230847 , dropVolts=4.782709 , iref=0.002048 , ohms=218.864487 batteryVolts=5.230847 , dropVolts=4.782146 , iref=0.002047 , ohms=219.159348 batteryVolts=5.231035 , dropVolts=4.783083 , iref=0.002047 , ohms=218.792984 batteryVolts=5.231222 , dropVolts=4.783083 , iref=0.002047 , ohms=218.884521 batteryVolts=5.231222 , dropVolts=4.782521 , iref=0.002048 , ohms=219.139282 batteryVolts=5.230097 , dropVolts=4.782896 , iref=0.002047 , ohms=218.426636 batteryVolts=5.230472 , dropVolts=4.782333 , iref=0.002047 , ohms=218.884521 batteryVolts=5.230472 , dropVolts=4.781771 , iref=0.002047 , ohms=219.159348 batteryVolts=5.230659 , dropVolts=4.782709 , iref=0.002048 , ohms=218.772736 batteryVolts=5.231035 , dropVolts=4.781959 , iref=0.002047 , ohms=219.342407 batteryVolts=5.230472 , dropVolts=4.781396 , iref=0.002047 , ohms=219.342407 batteryVolts=5.230847 , dropVolts=4.782333 , iref=0.002047 , ohms=219.067810 batteryVolts=5.230659 , dropVolts=4.782709 , iref=0.002047 , ohms=218.792755 batteryVolts=5.230285 , dropVolts=4.782333 , iref=0.002047 , ohms=218.792984 batteryVolts=5.231035 , dropVolts=4.782521 , iref=0.002047 , ohms=219.067810 batteryVolts=5.231222 , dropVolts=4.782896 , iref=0.002047 , ohms=218.976059 batteryVolts=5.230847 , dropVolts=4.783083 , iref=0.002048 , ohms=218.681442 batteryVolts=5.231035 , dropVolts=4.783083 , iref=0.002048 , ohms=218.772964 batteryVolts=5.231410 , dropVolts=4.782896 , iref=0.002047 , ohms=219.067581 batteryVolts=5.231410 , dropVolts=4.782709 , iref=0.002047 , ohms=219.159119 batteryVolts=5.229909 , dropVolts=4.782896 , iref=0.002047 , ohms=218.334869 batteryVolts=5.230659 , dropVolts=4.782333 , iref=0.002048 , ohms=218.956009 batteryVolts=5.231597 , dropVolts=4.783646 , iref=0.002047 , ohms=218.792755 batteryVolts=5.231597 , dropVolts=4.783271 , iref=0.002047 , ohms=218.976059 batteryVolts=5.232535 , dropVolts=4.784208 , iref=0.002047 , ohms=218.976288 batteryVolts=5.232160 , dropVolts=4.783834 , iref=0.002047 , ohms=218.976059 batteryVolts=5.231785 , dropVolts=4.783646 , iref=0.002047 , ohms=218.884521 batteryVolts=5.231972 , dropVolts=4.783646 , iref=0.002047 , ohms=218.976059 batteryVolts=5.231597 , dropVolts=4.783271 , iref=0.002048 , ohms=218.956009 batteryVolts=5.232160 , dropVolts=4.783459 , iref=0.002047 , ohms=219.159119 batteryVolts=5.231410 , dropVolts=4.783083 , iref=0.002048 , ohms=218.956009 batteryVolts=5.231410 , dropVolts=4.782709 , iref=0.002048 , ohms=219.139053 batteryVolts=5.230847 , dropVolts=4.782333 , iref=0.002048 , ohms=219.047760 batteryVolts=5.231222 , dropVolts=4.783271 , iref=0.002048 , ohms=218.772964 batteryVolts=5.231222 , dropVolts=4.782521 , iref=0.002047 , ohms=219.159348 batteryVolts=5.230659 , dropVolts=4.782896 , iref=0.002048 , ohms=218.681213 batteryVolts=5.230659 , dropVolts=4.782709 , iref=0.002047 , ohms=218.792755 Nakon 250 sampla ohms=218.958301 root@LEDErpi /overlay #


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mikikg Offline
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#5
06-16-2023, 10:12 PM
(06-15-2023, 02:25 PM)savan Wrote: Prvi rezultati naponske reference izmereni preko ADC sa ove plocice : )

Code:
root@LEDErpi /overlay # ./max ... raw=0x3ffc , Volts=2.047437 raw=0x3ffb , Volts=2.047437 ...

Lepo to radi! +/-1 count od 16bit A/D konvertera.

Samo ti matematika nesto nije dobra za pretvaranje u napon, mora da pokaže razlicite rezultate (ili formatiranje/konverzija u float nije dobra ili nisi stavio tacke za brojeve, nije isto 1 i 1.0).

Kada skupljaš više semplova pa nadješ prosek to se generalno zove "Oversampling", radi se sa skupljanjem RAW koji su za nas Integer i posle kad se deli trebaš da navedeš npr x/100.0 (dakle bitno je ovo .0 iza broja) da bi rezultat bio float i da bi ga korektno prikazao.
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mikikg Offline
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#6
06-16-2023, 11:15 PM
Quote:Voltage Reference
The ADS111x have an integrated voltage reference. An external reference cannot be used with these devices. Errors associated with the initial voltage reference accuracy and the reference drift with temperature are included in the gain error and gain drift specifications in the Electrical Characteristics table.

Izabrao si ADC na koji ne može da se priključi externa naponska referenca jer ima svoju internu.
Većina A/D ima Vref ulaz gde se dovodi referetni napon i on odredjuje maksimalnu naponsku vrednost za konverziju.

Tehnički može da se potroši jedan kanal sa kojim sempluješ napon sa reference i da njega uzmeš kao osnova za kalkulaciju, praktično radiš diferencialno merenje izmedju tvoje externe reference za koju znaš koja je vrednost (izmerio si i upisao u program i predpostavljaš da je taj napon stabilan) i napona sa ostalih kanala koje meriš.

Kada imaš moćan ARM kontroler možeš da se igraš sa tom matematikom u floating-point domenu koliko hoćeš i nije problem da se tako rešavaju referetne vrednosti za A/D konverter.

Kod manjih kontrolera biraju napon reference tako kao ova od 2.048V jer je to tačno 12bit za 12bit A/D konvertere i onda im je jedan bit "okruglo" 0.001V tj 1mV i to je lako za račun jer može da se ostane u Integer domenu sa matematikom da se ne prelazi u floating-point koji je za male kontrolere baš naporan.
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savan Offline
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#7
06-17-2023, 07:56 AM (This post was last modified: 06-17-2023, 08:26 AM by savan.)
Moguce da nesto nisam dobro matematicki odradio a vrlo je moguce da moze i na drugaciji nacin da se radi, nisam jos osmislio sta treba da uradim sa ads1115 da povecam preciznost merenja, sada kako je podesen adc koristi najgori moguci FSR=6.144 sto je nekih 187uV po LSB a ne mogu da prebacim u glavi koja bi formula bila za izracunavanje otpornosti ako postavim FSR na 0.256 tada je LSB 7.8uV, nesto verovatno ne radim kako treba, buni me formula za izracunavanje gde imamo poznat R4=1k i imamo poznatu struju koja je proporcionalna naponskoj referenci i R4 sto je 2.04737 mA. Verovatno i DUT nije prikljucen na uredjaj kako treba, ja DUT kacim izmedju baterije (+5V) i Iref. A adc kacim takodje na te dve tacke. I onda koristim formulu, mozda i pogresno:

Code:
    double ohms = 0.0; for (uint8_t i=0; i<50; ++i) { float battery = (float)(ADS1115_Read(AIN1GND) * (6.144 / 32767.0)); float drop = (float)(ADS1115_Read(AIN0GND) * (6.144 / 32767.0));         float iref = (float)(ADS1115_Read(AIN2GND) * (6.144 / 32767.0));         iref /= 1000.0;         ohms += (battery - drop) / iref; printf("batteryVolts=%f , dropVolts=%f , iref=%f , ohms=%f\n", battery, drop, iref, (battery - drop) / iref); //usleep(100000); }     ohms = ohms / 50.0;         printf("Nakon 50 sampla ohms=%f\n", ohms);

Znaci merim tri stvari, napon reference (da bi proporcionalno tome dobio vrednost struje jer sklop je takav da struja zavisi od R4 i naponske reference), napon baterije, pad napona na otporniku. Mozda nema potrebe to da radim, upravo zbog toga sto nisam prebacio u glavi kako to treba da se uradi. A zbog napona kojeg treba da ocitam na bateriji i na otporniku, znaci 5.10V upravo ne mogu da smanjim vrednost FSR na adc nego koristim najveci moguci ujedno najneprecizniji.

[Image: attachment.php?aid=40445]

Dali to znaci da ako bi postavio FSR na 0.256V onda na DUT morao da imam napon 0.256V ? Ta konekcija DUT-a na sklop mi nije naj jasnija, i koje tacke merim ADC-om. Mozda radim sve pogresno! Verovatno da moze cak da se koriste dva kanala adc-a u registrima podesena na DIFF i sa FSR=0.256 da se izmeri diferencijalno samo te dve tacke na otporniku? Adc ima i svoj komparator koji takodje moze za nesto da se upotrebi. Dosta mogucnosti postoji samo treba znati sta i kako : )


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savan Offline
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#8
06-17-2023, 08:56 AM (This post was last modified: 06-17-2023, 09:21 AM by savan.)
Ih pa da, ja to sve radim pogresno, nema potrebe da merim bateriju nego samo napon na otporniku, ovo su novi rezultati. Podeseno na DIFF (kanal 0 i kanal 1), FSR postavljen na 0.512, izmeren napon na otporniku diferencijalno:

Code:
0.447779 0.447779 0.447826 0.447811 0.447811 0.447842 0.447811 0.447795 0.447795 0.447795 0.447826 0.447795 0.447764 0.447795 0.447764 0.447811 0.447826 0.447779 0.447779 0.447795 0.447795 0.447857 0.447811 0.447826 0.447795 0.447826 0.447795

Eventualno meriti i napon reference i onda bi racunica za otpornik bila = izmereno/iref

Edit:
rezultat jednog sampla ponovljen nekoliko puta, bez merenja naponske reference, super rezultat! Kada se doda oversampling i izmeren napon reference u formulu i podeli sa brojem sampla rezultat ce da bude odlican! : )

Code:
root@LEDErpi /overlay # ./ref ohm=218.787216 root@LEDErpi /overlay # ./ref ohm=218.771942 root@LEDErpi /overlay # ./ref ohm=218.779572 root@LEDErpi /overlay # ./ref ohm=218.771942 root@LEDErpi /overlay # ./ref ohm=218.771942 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.771942 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.779572 root@LEDErpi /overlay # ./ref ohm=218.771942 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.779572 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.749039 root@LEDErpi /overlay # ./ref ohm=218.771942 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.779572 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.787216 root@LEDErpi /overlay # ./ref ohm=218.764313 root@LEDErpi /overlay # ./ref ohm=218.749039 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.749039 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.779572 root@LEDErpi /overlay # ./ref ohm=218.771942 root@LEDErpi /overlay # ./ref ohm=218.771942 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay # ./ref ohm=218.756683 root@LEDErpi /overlay #

Samo jos da mi se rascisti u glavi koji nam je range otpornika ako nam je poznata struja 2.048mA i koji je FSR za koji otpornik, na otporniku male vrednosti hmm FSR bi trebao da bude podesen na najmanji moguci ili ako je veci otpornik koji FSR bi trebalo postaviti ali otom potom odlicno je ovo. Promenom R4 menjamo i konstantnu struju pa recimo dodavanjem veceg otpornika od recimo 10k na R4 struja bi nam bila 0.2048mA, time bi se mogao meriti i miliohm otpornik. Ako vam je intersantno mozemo napraviti jedan uredjajcic od ovoga za merenje otpora.
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savan Offline
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#9
06-17-2023, 11:15 AM (This post was last modified: 06-17-2023, 11:44 AM by savan.)
Doradio sam program i uneo u formulu izmereni Vref koji se meri na svakom samplu, Vref je spojen na AIN2, a otpornik na dva kanala diferencijalno meren napon pomocu AIN0 i AIN1, i uradio sam 3 ponovljena merenja od 250 samplova koji su podeljeni na kraju sa 250, greska je 0.01 ohm, nije ovo lose! : )

Code:
root@LEDErpi /overlay # ./ref dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447623 , iref=0.002047 , ohms=218.632660 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447701 , iref=0.002047 , 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dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447607 , iref=0.002047 , ohms=218.618347 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447607 , iref=0.002047 , ohms=218.625015 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447623 , iref=0.002047 , ohms=218.632660 dropVolts=0.447623 , iref=0.002047 , ohms=218.632660 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , 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dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447639 , iref=0.002047 , ohms=218.640274 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447607 , iref=0.002047 , ohms=218.618347 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 (250 samples) ohms=218.646186
Code:
dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447717 , iref=0.002047 , ohms=218.671783 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447686 , iref=0.002047 , 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ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 (250 samples) ohms=218.654658
Code:
dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447717 , iref=0.002047 , ohms=218.671783 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447717 , iref=0.002047 , ohms=218.671783 dropVolts=0.447717 , iref=0.002047 , ohms=218.671783 dropVolts=0.447670 , iref=0.002047 , 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iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 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ohms=218.633621 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.655548 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447717 , iref=0.002047 , ohms=218.671783 dropVolts=0.447717 , iref=0.002047 , ohms=218.671783 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447717 , iref=0.002047 , ohms=218.671783 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447701 , iref=0.002047 , ohms=218.670807 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447701 , iref=0.002047 , ohms=218.670807 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447639 , iref=0.002047 , ohms=218.633621 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447717 , iref=0.002047 , ohms=218.671783 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447701 , iref=0.002047 , ohms=218.664139 dropVolts=0.447623 , iref=0.002047 , ohms=218.625992 dropVolts=0.447670 , iref=0.002047 , ohms=218.648880 dropVolts=0.447686 , iref=0.002047 , ohms=218.656509 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447686 , iref=0.002047 , ohms=218.663177 dropVolts=0.447654 , iref=0.002047 , ohms=218.641251 dropVolts=0.447654 , iref=0.002047 , ohms=218.647903 (250 samples) ohms=218.653388 root@LEDErpi /overlay #

Trebalo bi mozda povecati FSR na AIN2 kanalu, trenutno je na 2.048, mozda ga staviti na 4.096 u slucaju da voltage referenca ima veci napon od 2.048V


Attached Files
.c   ref.c (Size: 11,8 KB / Downloads: 0)
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savan Offline
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#10
06-17-2023, 12:31 PM (This post was last modified: 06-17-2023, 01:02 PM by savan.)
Novo merenje sa double varijablama, fsr na Vref 4.096, sada nam je ponovljeno merenje u nekoliko puta sa greskom ispod 0.00X ohm, ovo je stvarno super rezultat

Code:
root@LEDErpi /overlay # gcc -Wall -O3 ref.c -o ref strip root@LEDErpi /overlay # strip ref root@LEDErpi /overlay # sync root@LEDErpi /overlay # ./ref (250 samples) ohms=218.5743316500 root@LEDErpi /overlay # ./ref (250 samples) ohms=218.5739118108 root@LEDErpi /overlay # ./ref (250 samples) ohms=218.5750108671 root@LEDErpi /overlay # ./ref (250 samples) ohms=218.5748120437 root@LEDErpi /overlay # ./ref (250 samples) ohms=218.5751172060 root@LEDErpi /overlay # ./ref (250 samples) ohms=218.5749492765 root@LEDErpi /overlay # ./ref (250 samples) ohms=218.5773526968 root@LEDErpi /overlay # ./ref (250 samples) ohms=218.5776122692

Code:
dropVolts=0.4475292861 , iref=0.0020474374 , ohms=218.5802016285 dropVolts=0.4474980235 , iref=0.0020474374 , ohms=218.5649324751 dropVolts=0.4475136697 , iref=0.0020474374 , ohms=218.5725743298 dropVolts=0.4475292861 , iref=0.0020474374 , ohms=218.5802016285 dropVolts=0.4475292861 , iref=0.0020474374 , ohms=218.5802016285 dropVolts=0.4474667907 , iref=0.0020474374 , ohms=218.5496778776 dropVolts=0.4475136697 , iref=0.0020474374 , ohms=218.5725743298 dropVolts=0.4474980235 , iref=0.0020474374 , ohms=218.5649324751 dropVolts=0.4475449026 , iref=0.0020474374 , ohms=218.5878289273 dropVolts=0.4474667907 , iref=0.0020474374 , ohms=218.5496778776 dropVolts=0.4474824071 , iref=0.0020474374 , ohms=218.5573051764 dropVolts=0.4475136697 , iref=0.0020474374 , ohms=218.5725743298 dropVolts=0.4475136697 , iref=0.0020474374 , ohms=218.5725743298 dropVolts=0.4475292861 , iref=0.0020474374 , ohms=218.5802016285 dropVolts=0.4474980235 , iref=0.0020473125 , ohms=218.5782697692 dropVolts=0.4475136697 , iref=0.0020474374 , ohms=218.5725743298 dropVolts=0.4475292861 , iref=0.0020474374 , ohms=218.5802016285 dropVolts=0.4475605190 , iref=0.0020474374 , ohms=218.5954562260 dropVolts=0.4474980235 , iref=0.0020474374 , ohms=218.5649324751 dropVolts=0.4475292861 , iref=0.0020474374 , ohms=218.5802016285 dropVolts=0.4474980235 , iref=0.0020473125 , ohms=218.5782697692 dropVolts=0.4475449026 , iref=0.0020474374 , ohms=218.5878289273 dropVolts=0.4474824071 , iref=0.0020474374 , ohms=218.5573051764 dropVolts=0.4475136697 , iref=0.0020474374 , ohms=218.5725743298 dropVolts=0.4475449026 , iref=0.0020474374 , ohms=218.5878289273 dropVolts=0.4474980235 , iref=0.0020474374 , ohms=218.5649324751 dropVolts=0.4475136697 , iref=0.0020475626 , ohms=218.5592127479 dropVolts=0.4475292861 , iref=0.0020474374 , ohms=218.5802016285 dropVolts=0.4475136697 , iref=0.0020474374 , ohms=218.5725743298 dropVolts=0.4474667907 , iref=0.0020474374 , ohms=218.5496778776 dropVolts=0.4475136697 , iref=0.0020473125 , 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savan Offline
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#11
06-17-2023, 12:52 PM (This post was last modified: 06-17-2023, 01:05 PM by savan.)
Ah sad vidim da je i SPS=250 prevelik, za jos precizniji rezultat treba ga smanjiti na SPS=64 da se dobije efektivnih 16bit-ova , i treba dodati jedan Cdiff izmedju ova dva diff kanala gde nam je DUT

[Image: attachment.php?aid=40448]

Edit:
Popravljen program na 64 SPS, nisam probao jer sam spakovao sve van stola, trebalo bi da je to sad sve ok.


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