https://devzone.nordicsemi.com/f/nordic-q-a/44938/adc-measurement-0-1-25vDear All, I‘m going nuts while working on the basically really simpe task of reading ADC voltages on GPIO (AIN3) between 0 and 1.25V. The voltage should fit well in any range so I thought I could just use a simple GAIN_1 setting with internal referenceen-USTelligent Community 13Mon, 18 Mar 2019 13:12:00 GMThttps://devzone.nordicsemi.com/thread/176718?ContentTypeID=1Mon, 18 Mar 2019 13:12:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:51476de9-9fbc-471e-a5d6-66d03843e531&#216;yvind<p>Hello,<br /><br />What settings are you using?<br />&nbsp;</p> [quote user=""]But I don‘t get the right results. At least not if readings should give millivolts with no further calculations needed.[/quote] <p>Have you looked at SAADC<a href="https://www.nordicsemi.com/DocLib/Content/SDK_Doc/nRF5_SDK/v15-3-0/nrf_dev_saadc_example">&nbsp;example</a>? Also, have a look at the SAADC<a href="https://www.nordicsemi.com/DocLib/Content/Product_Spec/nRF52840/latest/saadc">&nbsp;chapter</a> in the product specification. The formula to calculate the output can be found <a href="https://www.nordicsemi.com/DocLib/Content/Product_Spec/nRF52840/latest/saadc?855#saadc_digital_output">here</a>.<br /><br />Kind regards,<br />Oeyvind</p><div style="clear:both;"></div>