CubeCell Module + Custom PCB + Read battery voltage

#1

Hi again,

sorry for spamming, but i need your advice again.

I need to read the battery voltage on my custom pcb and i found two circuits on the Heltec site.

This is how i did it in my own pcb. The result i get is 2.25V. The battery itself has ~3.6V

adc_2
adc_2.png1333×921 50.1 KB

This is a second version i found

adc_1
adc_1.png718×474 37.7 KB

i woundering about the voltage devider, they are different.
I assume it has to be like in the second circuit?

#2

Replaced the 220k resistor by an another 100k resistor, now i’m getting 3.6V.
Doing some math in my sketch instead, would got me the same result…
Anyway, it works now :slight_smile:

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