Reading the Analog input on NRF51

[Nikhil]

github.com/.../ble_app_uart_adc_simple I have flashed the above program in the link on to my nrf51822 DK. I can see the values of the samples but i do not understand what the output is. The analog pin that is configured in P0.01 . I did not connect anything to this pin. But I still see the output. I connected VDD to the P0.01 pin that is configured for ADC output , but I don't see any change in the output values from when it is not connected to anything.

Can anyone help in connecting the potentiometer to the analog pin and see the output? If there are any examples please let me know. This the output i am getting without connecting anything to analog pin configured(AIN2(P0.01)).

[Jørgen Holmefjord]

Have you changed anything in the example? I get 512 when nothing connected, 1023 when connected to VDD and 3 when connected to GND. Could you try flashing the precompiled hex-file, found in the repository?

[Nikhil]

I have not changed anything in the example. i don't know if i am doing wrong anywhere. I flashed the program directly from repository. Do we need to do anything with the sample values obtained? the sample values i am getting are always in 800+. Do i need to change anything in the program?

[Jørgen Holmefjord]

Are you using the nRF51 DK (PCA10028), or some older board?

[Nikhil]

yes i am using NRF51 DK (PCA10028)

[Nikhil]

Thank you for the help Jørgen Holmefjord. I have the configured the other pin for analog input. Now it is working fine. I really appreciate for your prompt response.