SAADC sample observations decoding

RE: SAADC sample observations decoding

Karl Ylvisaker — Wed, 07 Apr 2021 11:58:40 GMT

[quote user="Jonnavittula sridhar"]I have gone through formula. I am using default config in sample example. 10 bit resolution, gain 1/6, internal reference, single ended. [/quote]

Thank you for clarifying.

[quote user="Jonnavittula sridhar"]In the formula if I keep resolution as 10 then I can see some related values. 10 is value id and 1 is value. So we have to use value ID. Is that right?[/quote]

You can configure the resolution (and all other configs) using the provided type for this, in this case nrf_saadc_resolution_t. If you want to change the resolution to 12 bit, for example, you would set it to NRF_SAADC_RESOLUTION_12BIT.

You should not manipulate the registers simultaneously as you are using the driver, since this may place the driver in an invalid state and break it.

Best regards,
Karl

RE: SAADC sample observations decoding

Sridhar Jonnavittula — Wed, 07 Apr 2021 08:04:53 GMT

I have gone through formula. I am using default config in sample example. 10 bit resolution, gain 1/6, internal reference, single ended.

In the formula if I keep resolution as 10 then I can see some related values. 10 is value id and 1 is value. So we have to use value ID. Is that right?

RE: SAADC sample observations decoding

Karl Ylvisaker — Tue, 06 Apr 2021 13:19:04 GMT

Hello,

[quote user=""]When I connect pin 2 with VDD on header P1, output is range of 830-840.[/quote]

What is your SAADC configuration, and what is the range of the voltage you are trying to measure?
I suppose if you are using 10 bit resolution with an input range of 0 - 3.6V, and you are measuring a voltage of 3 V, like VDD, you should expect to see SAADC output values around ~850.

[quote user=""]What is the range and how can I decode it?[/quote]

You can calculate your input range by using the formula in the SAADC documentation.

Best regards,
Karl