nrf52810 board low battery alarm

[mjr]

I'd like to know about the current battery capacity of the nrf52810 board.

Do you have any related documents or examples?

Thank you.

[Eugene Yu]

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.

[mjr]

Thank you.

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

[Eugene Yu]

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.