Access to the nRF9161 General-Purpose Input/Output (GPIO)s is available from connectors P2, P3, P4, P6, and P24. The nRF9161 DK supports the Arduino UNO interface.
Figure 1. Access to GPIOs
GPIO signals are also available on connectors P7, P8, P9, P10, P12, and P27 which are on the back of the Development Kit (DK). By mounting pin headers on the connector footprints, the nRF9161 DK can be used as a shield for Arduino motherboards.
For easy access to GPIO, power, and ground, the signals can also be found on the through-hole connectors P14, P15, P16, and P17.