ADC not converting properly

[Tarik]

Hello, I'm using a code posted on this forum to read ADC input and fill an array with the ADC values but I always get values between 166 and 174, (even if I connect the ADC input: AIN2 -> P0.01 to Vcc) anyone knows the reason or the solution.

I'm using the Nordic Nrf51822 EK and here is my code :

thank you for the help

adc_exp.rar

[Håkon Alseth]

Hi Tarik,

It seems that you do not connect the input buffer on AIN2/P01. Try setting it as a input first: nrf_gpio_cfg_input(1);

The ADC does not connect the input buffers before claiming the pin, which is the reason why you see such strange measurements.

Best regards Håkon