https://devzone.nordicsemi.com/f/nordic-q-a/84968/i-don-t-understand-the-role-of-data-done-p_bufferHello I am implementing a battery voltage monitoring function using nrf52840. I am a beginner in hardware development. As the first step of this function, I am currently implementing a function to read the voltage value. I am using the function &quot;es_battery_voltage_geten-USTelligent Community 13Mon, 21 Feb 2022 09:27:02 GMThttps://devzone.nordicsemi.com/thread/354071?ContentTypeID=1Mon, 21 Feb 2022 09:27:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5a6f1f63-7426-4899-a3e2-0e62e84468a0Karl Ylvisaker<p>Hello,<br /><br />The&nbsp;p_evt-&gt;<a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.1.0/structnrfx__saadc__done__evt__t.html">data.done.p_buffer</a> is a pointer to the samples created by the SAADC&#39;s sampling.&nbsp;<a href="https://infocenter.nordicsemi.com/topic/ps_nrf52840/saadc.html?cp=4_0_0_5_22_3#saadc_easydma">Each SAADC sample is 2 bytes</a>.<br />How large is the SAADC&#39;s buffer? If it is only 1 then you are accessing random data by trying to read index 1.<br />Furthermore, the nRF52840 DK does not need the&nbsp;DIODE_FWD_VOLT_DROP_MILLIVOLTS offset since it uses power switches rather than diodes.<br /><br />Best regards,<br />Karl</p><div style="clear:both;"></div>