https://devzone.nordicsemi.com/f/nordic-q-a/34296/nordic-evaluation-board-io-pin-cannot-be-set-to-high-levelI wrote a pulse generation application on pin of nordic evaluation board to communicate from a sensor (according to the manual of that sensor) however, there is s a step that the pin could not be high even it is set high in code by &quot;nrf_gpio_cfg_outputen-USTelligent Community 13Mon, 14 May 2018 12:58:40 GMThttps://devzone.nordicsemi.com/thread/131883?ContentTypeID=1Mon, 14 May 2018 12:58:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:69a616a5-d758-4932-af53-cc3338db04bfVidar Berg<p>Hello, is it possible that the output is being driven low by the sensor, or is it a high impedance input? You may try to configure the ouput with high drive to see if that helps, see GPIO-&gt;PIN_CNF[] register in nRF51 RM for more details.&nbsp;</p><div style="clear:both;"></div>