How do i measure the battery voltage?

[misterlisty]

Can i just connect the + of the battery to a ADC input(with voltage divider). Any done this before? I'm using the pysense, pytrack boards but i assume this doesnt matter.

[jcaron]

@misterlisty If you are using a Pysense or Pytrack you don't need to use the ADC input or add a voltage divider. That's already done on the board, and you can read it using the read_battery_voltage method of the relevant library.

I think it's also more accurate that the ESP32 ADC, though I haven't really compared them.

[misterlisty]

@robert-hh thank you

[robert-hh]

@misterlisty Sure, you can. Please keep in mind that the voltage divider draws current too, so use high resistor values. If you go for e.g. 330kOHm + 100kOhm, the current drawn is about 10µA. Soi better go for even higher values. Also, add a capacitor of ~10nF between the ADC input and GND, to keep the dynamic impedance low for the measurement cycle.