nrf52832 ble battery display

RE: nrf52832 ble battery display

Kenneth — Wed, 15 Sep 2021 11:49:52 GMT

I don't have any ready made example for you.

Looking at implementation ble hids mouse I can find that the battery measurement is emulated, you can find that the battery level changes between 81% and 100% in main.c:

sensor_simulator_init() - init the simulator

battery_level_update() - update the battery values

The ble_bas_battery_level_update() set the actual battery to 'battery_level' in battery_level_update(). You need to replace 'battery_level' from an actual SAADC measurement.

So, in your case you need to measure the battery level, and the battery level needs to be 0-100% depending on the state of the battery. I can find this case:

https://devzone.nordicsemi.com/f/nordic-q-a/50141/how-to-measure-a-state-of-a-battery-by-using-saadc-example-with-nrf52832

Where I can find that someone made an example that converted the measured SAADC value to a battery percentage level between 0-100%.

Best regards,
Kenneth

RE: nrf52832 ble battery display

sabsari — Tue, 14 Sep 2021 23:14:11 GMT

Hi,kenneth

The development was focused on Bluetooth, so SAADC example code was attached to the HID keyboard example.Does the example of the HID keyboard contain a function that can measure battery levels? Can you show us an example?

RE: nrf52832 ble battery display

Kenneth — Tue, 14 Sep 2021 11:23:35 GMT

Hi,

Last time I checked if you used for instance the HID mouse or HID keyboard example from the nRF5 SDK you can see that the battery level changes in Windows 10. Note however in that case the battery level is emulated for demonstration, so it doesn't read the SAADC in specific, but you can see that the battery level changes. Have you tried that example for comparison?

Kenneth