Lower ADC measurements on ESP32
Posted: Fri Jan 31, 2020 3:23 pm
by fcampos
I need to measure in a system I'm creating voltages ranging from 2mv-50mv. Since ESP32 minimum attenuation can only measure from 100mv-950mv, is there i can possibly read my range values with an ESP32-WROOM-32?
Thanks.
Re: Lower ADC measurements on ESP32
Posted: Mon Feb 03, 2020 4:12 pm
by gunar.kroeger
esp32 has a really bad and noisy adc. You can get multiple samples and get the moving mean value, if precision and sample rate are not that important, but you still would have to use an rail-to-rail OP amp to add a constant value and amplify the signal to get away from the lower minimum voltage limitation.
The better option would be getting an external ADC