https://devzone.nordicsemi.com/f/nordic-q-a/123664/nrf9151dk-i-o-expander-handlingHello, I would have a question regarding the use of PCAL6408A I/O expander on nRF9151 DK. The buttons and LEDs on nRF9151 DK are connected both directly to the processor and to the I/O expander which enables to free up some pins. I would have followingen-USTelligent Community 13Thu, 14 Aug 2025 07:36:29 GMThttps://devzone.nordicsemi.com/thread/545624?ContentTypeID=1Thu, 14 Aug 2025 07:36:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:03f8213e-439e-44f8-8bcd-6863128f44d5Jacob W<p>Thank you, it worked for me!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/545577?ContentTypeID=1Wed, 13 Aug 2025 18:52:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d029333a-97f0-4f73-ae3f-1c0cfb72e562Kenneth<p>Hello,</p> <p>This should be straight forward yes.</p> <p>All the changes required to use the io expander for buttons and leds should be found in:<br />\zephyr\boards\nordic\nrf9151dk\dts\nrf9151dk_leds_on_io_expander.dtsi<br />\zephyr\boards\nordic\nrf9151dk\dts\nrf9151dk_buttons_on_io_expander.dtsi</p> <p>In addition for the DK you need to configure the board using the board controller app:<br /><a href="https://docs.nordicsemi.com/bundle/ncs-2.9.0/page/nrf/app_dev/device_guides/nrf91/nrf91_board_controllers.html#board_controller_on_the_nrf91x1_dks">https://docs.nordicsemi.com/bundle/ncs-2.9.0/page/nrf/app_dev/device_guides/nrf91/nrf91_board_controllers.html#board_controller_on_the_nrf91x1_dks</a>&nbsp;</p> <p>Kenneth</p><div style="clear:both;"></div>