Analog input pins on motherboard

[Igor Ishchenko]

Hello!

I have a very simple setup with Arduino board (see attachment)

I wish to move to the nRF51822. I have the development kit and the nRF Go motherboard.

As I understood from the docs I should connect to P5 connector which is not mounted on the DK modules. So +3.3 will be AREF and A0 will be AIN0. Am I correct?

Also docs state that "The analog inputs are routed through the extension connectors to the Motherboard." so I wonder how I can find to which pins on the motherboard they are routed.

Thank you

[Ole Morten]

You can take a look at the hardware files for the Development Kit module to see how P5 is connected to the chip, and the Product specification lists the pin functions in table 1.

Basically, you can connect your A0 to for example AIN7, which is P0.06 on the chip. Remember to comply with the maximum ADC input voltages, as given here.