Hi ! I want to measure a 12V battery with the Pico ADC and it seems it read a lower value than it is in reality.
The setup is as follows:
- a 3V reference on the VREF pin, like is recommended in the datasheet
- all Pico GND pins (except AGND) connected to main ground plane
- battery gnd connected to main ground plane
- the voltage divider connected between the BAT+ and AGND
Is this wrong ?
I saw that all people on the internet doesn't use the AGND pin. I don't understand what it is whit this pin... It is not for connecting the analog signal ground ? I mesured and it seems that AGND si connected internally with the rests of the GND pins...
The setup is as follows:
- a 3V reference on the VREF pin, like is recommended in the datasheet
- all Pico GND pins (except AGND) connected to main ground plane
- battery gnd connected to main ground plane
- the voltage divider connected between the BAT+ and AGND
Is this wrong ?
I saw that all people on the internet doesn't use the AGND pin. I don't understand what it is whit this pin... It is not for connecting the analog signal ground ? I mesured and it seems that AGND si connected internally with the rests of the GND pins...
Statistics: Posted by Marus780 — Fri Mar 08, 2024 10:18 pm — Replies 7 — Views 65