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  • Easy To Build Oxygen Analyzer Using An Arduino Compatible Micro Controller

    Hi and thanks for replying.Finally got time to play with it again and do some debugging.I was using ADS1115 board and at gain 16 it must have been too sensitive or something. Did a coversion of the reading to real mV on the screen and once set to gain 4 I finally get readings that are similar to the multimeter.Thanks again for the great post!

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  • Easy To Build Oxygen Analyzer Using An Arduino Compatible Micro Controller

    Hello. Have you tested the readings against some reference oxygen meter?I have some issues with results - I do get the output, put the readings are dependent on the air pressure to the sensor.My simple reference is just a multimeter. For my sensor it reads 10.1mV in air.I am actually testing for nitrogen, so expecting to see a drop. With nitrogen mix of about 10% O2, on the multimeter I get about 5mV. But on the arduino the readings translate to like 8%. I also tried O2 at high % (did not do reference read on the multimeter, so do not know what it was) - the readings on the arduino changed into negatives =(Also, after calibrating to 20.9% O2, if I unplug the sensor it still reads around 1.5% on the arduino.What am I doing wrong?

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