Example sketch program for using 4 ADC (12-bit) channels in nRF52832 bluefruit feather

[ramkanhiroten]

Hi,

I want to read 4 - ADC input channels (12-bit or 14-bit) from Bluefruit nRF52832 feather using sketch code. Can you point a sample code to do this?

I could read default one channel(using example sketch code found in the BSP IDE guide) given below and it works. I want to expand this and read 4 -ADC channels A0, A1, A2 and A3.

Appreciate your help. 

int adcChn0In = A0;
int adcValue = 0;

float microV_per_lsb = 1200.0F/16384.0F; //14-bit ADC with 1.2V reference voltage

analogReference(AR_INTERNAL_1_2);
analogReadResolution(14); 

adcValue = analogRead(adcChn0In);
delay(10);
Serial.print((float)adcValue * microV_per_lsb);
Serial.print(",");

[ramkanhiroten]

Thanks for your quick response on this. On sketch thread i will check with adafruit forums.

So if i switch to nRF52832 based DK board (nRF52 DK), can you point an example code to test the 4-ADC channels which i can build and test using the nRF52 DK installation?

Appreciate your support on this.

Thanks,

Ram

[awneil]

If you switch to the SDK, you'll want to start with the SDK example:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/nrf_dev_saadc_example.html

This does 1 channel.

Once you've got that, working, you can adjust for more channels.

eg, https://devzone.nordicsemi.com/f/nordic-q-a/45263/saadc-multiple-channel-acquisition