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pimoroni / enviroplus-python

Python library for the Enviro+ environmental monitoring board
https://shop.pimoroni.com/products/enviro-plus
MIT License
386 stars 181 forks source link

Read ADC #44

Closed psycik closed 4 years ago

psycik commented 4 years ago

When will this be possible? The current adc example only reads ref/gnd and the library has no access to the 4th input. I am looking to use my analog co2 sensor with this.

Gadgetoid commented 4 years ago

Our ADS1015 library is very strongly (probably mistakenly so) biased toward our ADS1015 breakout which includes an onboard reference connected to input 3. Thus the name ref/gnd being erroneously used in the library.

ref is actually just AIN3, and on Enviro+ this is connected via a 330Ohm current limiting resistor to the ADC breakout pin.