The Tinker Foundry

 Code listing used in video: // Tinker Foundry // Heart Rate Measurement with the MAX30102 breakout board using FFT // Connections from WEMOS D1 R32 board to MAX30102 Breakout Board as follows: //  SCL (ESP32) to SCL (breakout board) //  SDA (ESP32) to SDA (breakout board) //  3V3 (ESP32) to VIN (breakout board) //  GND (ESP32) to GND (breakout board) #include <Wire.h> #include "MAX30105.h"     // sparkfun MAX3010X library MAX30105 particleSensor; #include "arduinoFFT.h" arduinoFFT FFT; double avered       = 0 ; double aveir        = 0 ; double sumirrms     = 0 ; double sumredrms    = 0 ; int    i            = 0 ; int    Num          = 100 ;  // calculate SpO2 by this sampling interval int    Temperature; int    temp; float  ESpO2;               // initial value of estimated SpO2 double FSpO2        = 0.7 ;  // filter factor for estimated SpO2 double frate        = 0.95 ; // low pass filter for IR/red LED value to eliminate AC component #def