RE: n52840 ADC channel setting

Amanda Hsieh — Wed, 16 Oct 2024 14:21:30 GMT

Hi,

[quote user=""]I am using an example from NCS 2.6.0 and want to modify it to use ADC channel 6 (P0.30) to read voltage values, but I am unable to get the correct values. (When I flash the example using ADC channel 0, it reads the values correctly.) How should I modify it? [/quote]

You need to add an overlay file for it. For instance, to use AIN6 (P0.30) you can modify modules/hal/nordic/nrfx/samples/src\nrfx_saadc/boards/nrf52840dk_nrf52840.overlay that contains this:

/ {
	zephyr,user {
		io-channels = <&adc 6>;
	};
};

You can add other configurations as needed. Check out the example in this DevAcademy ADC course.

[quote user=""]Also, I want to continuously read the values rather than reading just once as in the example. Could you provide me with suggestions?[/quote]

Check out this post.

Regards,
Amanda H.