https://devzone.nordicsemi.com/f/nordic-q-a/1434/nrf51822-button-pull-upHi, I am working my way through the Nan 36 document and everything seems to be working fine. Have a question regarding Button Pullup. Little confused on this piece of code: static app_button_cfg_t buttons[] = { {WAKEUP_BUTTON_PIN, false, NRF_GPIO_PIN_PULLUPen-USTelligent Community 13Thu, 23 Jan 2014 12:54:07 GMThttps://devzone.nordicsemi.com/thread/6417?ContentTypeID=1Thu, 23 Jan 2014 12:54:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f749c498-f1d8-4740-ac0d-2ac2a911cc73H&#229;kon Alseth<p>Hi John,</p> <p>The example works in the way that it stores the last state of the button in function &quot;button_event_handler()&quot;. See variable &quot;send_push&quot;.</p> <p>This means that each time you press the button, the button event handler will execute, send the &quot;send_push&quot; variable to the ble_lbs-handler, then invert the state of &quot;send_push&quot;.</p> <p>This way you will get &#39;0&#39; first, then &#39;1&#39;, then &#39;0&#39;, and so on.</p> <p>Best regards Håkon</p><div style="clear:both;"></div>