https://devzone.nordicsemi.com/f/nordic-q-a/9310/adc-on-nrf51-pin-26-27Hello, I&#39;m using an PTR5188 development board for my project which breaks out PIN 26 &amp; 27 for ADC only. I&#39;m using mbed as my development platform and haven&#39;t been able to read my sensors output on either of these two pins. I&#39;ve done a minor modificationen-USTelligent Community 13Fri, 18 Sep 2015 09:20:25 GMThttps://devzone.nordicsemi.com/thread/34370?ContentTypeID=1Fri, 18 Sep 2015 09:20:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ca390cb4-509f-4db2-bb12-4baf6b7cea64Jens Str&#252;mper<p>Fantastic! That fixed the problem. Thanks a lot Wojtek! Cheers, Jens</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/34369?ContentTypeID=1Fri, 18 Sep 2015 08:47:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d12d5ef-1a0b-49cf-ac44-018cdf6eb06dWojtek<p>I know nothing about mbed, but maybe try that:</p> <pre><code>static const PinMap PinMap_ADC[] = { {p1, ADC0_0, 4}, {p2, ADC0_0, 8}, {p3, ADC0_0, 16}, {p4, ADC0_0, 32}, {p5, ADC0_0, 64}, {p6, ADC0_0, 128}, {p27, ADC0_0, 2}, {NC, NC, 0} }; </code></pre> <p>and probably for p26 it will be {p26, ADC0_0, 1} I assume the last value is the value that will be written in ADC CONFIG.PSEL register, that selects input of the ADC.</p><div style="clear:both;"></div>