nrf52810 board low battery alarm

RE: nrf52810 board low battery alarm

mjr — Fri, 09 Apr 2021 06:10:04 GMT

Thank you..!

I am currently using nus and dfus service. It works fine.
The secure DFU service is displayed in the nrfconnect app.

However, when ble_bas_enable, the duf service disappears and a battery service is created.

Is there a way to use it together?

NRF_SDH_BLE_VS_UUID_COUNT 2

NRF_SDH_BLE_SERVICE_CHANGED 1

RE: nrf52810 board low battery alarm

Eugene Yu — Wed, 07 Apr 2021 07:55:41 GMT

This may help you how to calculate the SAADC value.

If you are using the nRF52-DK by reading out the VDD, it will not change the value in a large variation.

Because the VDD is getting the same voltage level from the USB port always.

Please refer to the SAADC API document, if you need more details about the SAADC driver.

RE: nrf52810 board low battery alarm

mjr — Wed, 07 Apr 2021 06:30:45 GMT

Thank you.

If you change to NRF_SAADC_INPUT_VDD, it will appear as attached photo. Can you tell me what's being calculated?

RE: nrf52810 board low battery alarm

Eugene Yu — Wed, 07 Apr 2021 05:43:31 GMT

You can refer to the Saadc example that placed in SDK.

https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/nrf_dev_saadc_example.html?cp=7_1_4_6_35.

But you need to change the source to NRF_SAADC_INPUT_VDD instead of NRF_SAADC_INPUT_AIN0 in order to read out the VDD directly in case of what you used a coin-cell battery.