https://devzone.nordicsemi.com/f/nordic-q-a/25701/battery-volatge-problem-in-nrf51822hi, In my setup, I have a 3.7 V battery divided down to the bandgap range using a 100k and 100k resistors, so the voltage at the ADC input is 3.7 * (100/200) = 1.85 V. I am getting constant high voltage. can any suggest me plz? Details of the code givenen-USTelligent Community 13Sat, 07 Oct 2017 19:46:04 GMThttps://devzone.nordicsemi.com/thread/101242?ContentTypeID=1Sat, 07 Oct 2017 19:46:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cbb33944-8afe-4e0d-8e60-7c870636280cRahul Sahu<p>Hi john, I have gone through the link sent by you... I have changed the adc configuration and it&#39;s working now. Thank you very much.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/101241?ContentTypeID=1Thu, 05 Oct 2017 15:56:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4b0d66f3-0f56-4d66-9801-b0bea5959df1Rahul Sahu<p>Thanks John..I will check it and update you the result.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/101240?ContentTypeID=1Thu, 05 Oct 2017 06:41:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1f7bb3a8-b48b-47e9-b8f5-6ace37aa4660J&#248;rn<p>Hello Rahul Sahu</p> <p>You have set your prescaling to 1 and your reference to VDD/2. If you see table 311, page 165 of the nRF51 series <a href="http://infocenter.nordicsemi.com/pdf/nRF51_RM_v3.0.1.pdf">reference manual</a> you will see that with those settings the ADC will have a range of 0-1.5 V. Your battery voltage is therefore outside the ADC&#39;s range and the result will always return as maximum. You will either have to change the ADC settings, or reduce the AIN voltage. I recommend you read <a href="https://devzone.nordicsemi.com/blogs/30/measuring-lithium-battery-voltage-with-nrf51/">this blogpost</a> for guidance on battery measurements using the ADC of the nRF51.</p> <p>Best regards</p> <p>Jørn Frøysa</p><div style="clear:both;"></div>