RE: Zephyr "battery" example using VDD as the ADC input

matt_C — Fri, 25 Sep 2020 20:11:26 GMT

After looking around for a bit longer I found from https://github.com/zephyrproject-rtos/zephyr/tree/master/samples/boards/nrf/battery that if the device tree has a "vbatt" node then the battery voltage is measured with the divider defined there. Otherwise the internal source for VDD is assumed to be directly connected to the battery and as such is used for the battery measurements.

So, simply don't include a "vbatt" node if you want to use VDD to measure the battery.

RE: Zephyr "battery" example using VDD as the ADC input

JONATHAN LL — Fri, 25 Sep 2020 15:02:34 GMT

Hi Matthew,

[quote user=""]What do I need to put for the "io_channel" in the dts file for the following vbatt?[/quote]

I think the value is supposed to be 9 not 4.

I guess you are using the nrf52840dk

Regards,
Jonathan