https://devzone.nordicsemi.com/f/nordic-q-a/109337/bad-readings-only-at-red-led-max30101-with-xiao-nrf52840Good day! I need the Red, IR, and Green readings. I have the MAX30101 and Xiao BLE nRf52840 with the models shown in the pictures below. I just used the Hexiwear sample code for max30101 and only added lines in the proj.conf , xiao.overlay for dtsen-USTelligent Community 13Sat, 16 Mar 2024 02:33:58 GMThttps://devzone.nordicsemi.com/thread/474158?ContentTypeID=1Sat, 16 Mar 2024 02:33:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d0cdfd10-17cd-4584-840a-f549019317e6hmolesworth<p><span class="emoticon" data-url="https://devzone.nordicsemi.com/cfs-file/__key/system/emoji/1f642.svg" title="Slight smile">&#x1f642;</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/474157?ContentTypeID=1Sat, 16 Mar 2024 02:09:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3936bbff-669f-4640-8762-843f26ae20dcsacergoose199<p>Thank you for the tip! I changed the current to 0x33 similar to the default IR LED current and it looks fine now!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/474156?ContentTypeID=1Sat, 16 Mar 2024 01:41:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8ae8d1d8-a9e4-428f-9a0a-dc0369ae39d7hmolesworth<p>Perhaps try reducing the drive current for the red LED; I don&#39;t recall having trouble with&nbsp;signal level, but didn&#39;t use this code:</p> <p><pre class="ui-code" data-mode="c_cpp">Table 8. LED Current Control LEDx_PA [7:0] TYPICAL LED CURRENT (mA) 0x00h 0.0 0x01h 0.2 0x02h 0.4 … … 0x0Fh 3.0 … … 0x1Fh 6.2 … … 0x3Fh 12.6 … … 0x7Fh 25.4 … … 0xFFh 51.0</pre></p><div style="clear:both;"></div>