For the captor's code part we found successfully a code on github which will permit us to transform a photosensitive data to an analog data (wavenumbers, beats per minutes). In fact this code read "heart rate" data.

research source : https://github.com/sparkfun/SparkFun_MAX3010x_Sensor_Library/blob/master/examples/Example5_HeartRate/Example5_HeartRate.ino