 int LEDIR=D1;
 bool red_state;
 bool ir_state;
+bool state_diag;
 
 #include<math.h>
 

// Changes which LED to shine
void change_led_type()
{
    if(state_diag)
    {
      red_state = true;
      ir_state  = false;
    }
    else
    {
      red_state = false;
      ir_state  = true;
    }
    state_diag  = !state_diag;
}

#endif

#ifndef __PULSE_OX__
#define __PULSE_OX__ 1

float InputPin = A0; // Analog input pin from output of op amp
float sensorVoltage = 0;
