How can I read battery level on custom board nrf52833?

[Pham Tam]

Hi, I'm developing an application tracker device using 2 libuartes, pwm, ble and now I am going to approach reading battery level.
After I research on dev zone but I only got the blog  "how to read battery's voltage ?".
I planned using Saadc to read battery voltage then set  level from reality test. But when I used SAADC example, log info doesn't show anything on debug terminal
So I have some confusion to start reading battery level. Could you suggest for me some instructions to read battery level ?

[Jørgen Holmefjord]

Hi,

Battery measurement and battery level is showcased in the Proximity Application. This uses the SAADC to sample the battery voltage, converts the voltage to battery level from a defined battery characteristics curve, and expose this over the BLE Battery Service (BAS). If you have a different battery characteristics or supply voltage range, you need to change the implementation of battery_level_in_percent() in app_util.h.

Best regards,
Jørgen