How to Program NRF51422 w/S130 to read input pin into ADC

RE: How to Program NRF51422 w/S130 to read input pin into ADC

Øyvind Karlsen — Thu, 03 Mar 2016 12:06:15 GMT

Hi,

It is PIN 1 as in P0.01. This is stated in comments in the start of the main file.

RE: How to Program NRF51422 w/S130 to read input pin into ADC

CM — Mon, 29 Feb 2016 15:38:58 GMT

Clarifying question: is it pin 1 as in "P0.01" of CN3? Or "Pin No 1" map as "P0.25" on the table (Page 4 of the Taiyo Yunden manual linked above in the question)? According to the Github sample, the adc_init() function uses ADC_CONFIG_PSEL_AnalogInput2 which maps to NRF_ADC_CONFIG_INPUT_2 based off header file "nrf_adc.h". I failed to see any reference to Pin 1 in the sample code. Will appreciate some further feedback.

RE: How to Program NRF51422 w/S130 to read input pin into ADC

Øyvind Karlsen — Mon, 29 Feb 2016 14:11:07 GMT

Hi,

The code that you linked to reads the analog value from pin 1 and outputs it via UART and BLE. The output will be the 8bit int value from the ADC. The range in this particular example is from 0 to 3.6V, if you want to view the result in for example mV you can do the following: 3600*adc_result/255.

Best regards,

Øyvind