https://devzone.nordicsemi.com/f/nordic-q-a/20357/cannot-pull-down-a-gpio-pin-which-is-shared-with-ledHi, I added following code in saadc example code to set GPIO pin high/low and monitor it in the terminal. The pull up looks ok, but when I set it to low, the reading never goes down to 0. This happened on the shared pins with LED but not the othersen-USTelligent Community 13Fri, 10 Mar 2017 08:19:31 GMThttps://devzone.nordicsemi.com/thread/79345?ContentTypeID=1Fri, 10 Mar 2017 08:19:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ab683bf5-379e-4b08-8b0f-d4e7b39d77ffQuark<p>OK, thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/79344?ContentTypeID=1Fri, 10 Mar 2017 08:17:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bd2af741-4fb9-4559-a452-c31ef1ec5997J&#248;rgen Holmefjord<p>The LEDs on the nRF52 DK are <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52/dita/nrf52/development/nrf52_dev_kit/hw_btns_leds.html?cp=2_2_2_5_4">active low</a>. You can disconnect the LED by cutting SB5-SB8 if you want to use the pins for other tasks.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/79343?ContentTypeID=1Fri, 10 Mar 2017 08:11:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:c40c8dae-fa0b-4ea4-99a8-7518c2135bc7Quark<p>nRF52DK, P0.17~20 are shared with LED. When I set it to high, the reading is the same as VDD ~830, but when it is set to low, it keeps at ~111 and never goes to 1 or 2 as on GND, even if I pull high first then down.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/79342?ContentTypeID=1Fri, 10 Mar 2017 08:06:59 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bf0622ff-7fdf-47e9-ad27-adece14f9ba8J&#248;rgen Holmefjord<p>Which board are you using? <code>ARDUINO_7_PIN</code> is defined as GPIO 18 on the nRF52832. Are you checking the pin named P0.18?</p><div style="clear:both;"></div>