You can use the following settings as a starting point for wrist-based measurement. The green LED generally needs much more current than the red and IR for good results. To evaluate the quality, you should place the module against your wrist and then plot each color vs time and look for distinctive peaks for each heart beat. If the plot shows a straight line, then the ADC is saturated and the LED current is too high. If you just see noise, try increasing LED current or adjusting the sensor on your wrist.
Here are the recommended starting point settings:
- Pulse width: 411us
- ADC Full Scale: 8192nA
- Red: 10mA
- IR: 10mA
- Green: 50mA
