#include <MQUnifiedsensor.h>
/************************Hardware Related Macros************************************/
#define         Board                   ("ESP32")
#define         Pin2                     (32)  //Analog input 2 of your arduino

#define         Pin7                     (26)  //Analog input 7 of your arduino
#define         Pin135                     (34)  //Analog input 7 of your arduino

#define         PWMPin                   (5)   // Pin connected to mosfet
/***********************Software Related Macros************************************/
#define         RatioMQ2CleanAir          (9.83) //RS / R0 = 9.83 ppm 

#define         RatioMQ7CleanAir          (27.5) //RS / R0 = 27.5 ppm 
#define         RatioMQ135CleanAir          (3.6) //RS / R0 = 3.6 ppm  

#define         ADC_Bit_Resolution        (10) // 10 bit ADC 
#define         Voltage_Resolution        (5) // Volt resolution to calc the voltage
#define         Type                      ("ESP32") //Board used
/*****************************Globals***********************************************/
//Declare Sensor
MQUnifiedsensor MQ2(Board, Voltage_Resolution, ADC_Bit_Resolution, Pin2, Type);
MQUnifiedsensor MQ7(Board, Voltage_Resolution, ADC_Bit_Resolution, Pin7, Type);
MQUnifiedsensor MQ135(Board, Voltage_Resolution, ADC_Bit_Resolution, Pin135, Type);


unsigned long oldTime = 0;

void setup() {
  //Init serial port
  Serial.begin(115200);
  //init the sensor
  MQ2.init();
  MQ2.setRegressionMethod(1); //_PPM =  a*ratio^b
  MQ2.setA(574.25); MQ2.setB(-2.222); // Configure the equation to to calculate LPG concentration
  MQ2.setR0(9.659574468);
  
  MQ7.init(); 
  MQ7.setRegressionMethod(1); //_PPM =  a*ratio^b
  MQ7.setA(99.042); MQ7.setB(-1.518); // Configure the equation to calculate CO concentration value
  MQ7.setR0(4);

  MQ135.init();
  MQ135.setRegressionMethod(1); //_PPM =  a*ratio^b
  MQ135.setA(574.25); MQ135.setB(-2.222); // Configure the equation to to calculate LPG concentration
  MQ135.setR0(9.659574468);

  
    
 

   /*****************************  MQ CAlibration ********************************************/ 
  
  Serial.print("Calibrando sensores, por favor espere...");
  float MQ2calcR0 = 0, 
  
    MQ7calcR0 = 0,
    MQ135calcR0=0;
  
  for(int i = 1;  i<=10; i ++)
  {
    //Update the voltage Values
    MQ2.update();
    MQ7.update();
    MQ135.update(); 
    
    MQ2calcR0 += MQ2.calibrate(RatioMQ2CleanAir);
    
    MQ7calcR0 += MQ2.calibrate(RatioMQ7CleanAir);
    MQ135calcR0 += MQ135.calibrate(RatioMQ135CleanAir);
    

    Serial.print(".");
  }
  MQ2.setR0(MQ2calcR0/20);
  MQ7.setR0(MQ7calcR0/20);
  MQ135.setR0(MQ135calcR0/20);
  
  
  Serial.println("  done!.");
  
  Serial.print("Valores de R0 para cada sensor (MQ2 ,MQ7,MQ135):");
  Serial.print(MQ2calcR0/10); Serial.print(" | ");
  
  Serial.print(MQ7calcR0/10); Serial.print(" | ");
  Serial.print(MQ135calcR0/10); Serial.print(" | ");
  

  if(isinf(MQ2calcR0) ||  isinf(MQ7calcR0) || isinf(MQ7calcR0) ) {Serial.println("Warning: Conection issue founded, R0 is infite (Open circuit detected) please check your wiring and supply"); while(1);}
  if(MQ2calcR0 == 0 ||  MQ7calcR0 == 0|| MQ135calcR0==0 ){Serial.println("Warning: Conection issue founded, R0 is zero (Analog pin with short circuit to ground) please check your wiring and supply"); while(1);}
  /*****************************  MQ CAlibration ********************************************/ 
 
  //Print in serial monitor
  Serial.println("MQ2 and MQ7 ");
  Serial.println("*************************** Values from MQ-board ***************************");
  Serial.println("|    LPG   |     CO    | Alcohol |   CO2  |  Tolueno  |  NH4  |  Acetona  |");  
 // Serial.println("|    MQ-2  |   MQ-7   |    ");  
  //pinMode(calibration_button, INPUT);
}

void loop() {
  oldTime = millis();
  while(millis() - oldTime <= (60*1000))
  { 
    // VH 5 Volts
    analogWrite(5, 255); // 255 is DC 5V output
    readAllSensors();
    delay(500);
  }
  // 90s cycle
  oldTime = millis();
  while(millis() - oldTime <= (90*1000))
  {
    // VH 1.4 Volts
    analogWrite(5, 20); // 255 is 100%, 20.4 is aprox 8% of Duty cycle for 90s
    readAllSensors();
    delay(500);
  }
  
}

void readAllSensors()
{
  //Update the voltage Values
  MQ2.update();
  MQ7.update();
  MQ135.update();
  float MQ2Lecture =  MQ2.readSensor();
  float MQ7Lecture =  MQ7.readSensor();

  MQ135.setA(77.255); MQ135.setB(-3.18); //Configure the equation to calculate Alcohol concentration value
  float Alcohol = MQ135.readSensor(); // SSensor will read PPM concentration using the model, a and b values set previously or from the setup

  MQ135.setA(110.47); MQ135.setB(-2.862); // Configure the equation to calculate CO2 concentration value
  float CO2 = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup

  MQ135.setA(44.947); MQ135.setB(-3.445); // Configure the equation to calculate Toluen concentration value
  float Tolueno = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
  
  MQ135.setA(102.2 ); MQ135.setB(-2.473); // Configure the equation to calculate NH4 concentration value
  float NH4 = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup

  MQ135.setA(34.668); MQ135.setB(-3.369); // Configure the equation to calculate Aceton concentration value
  float Acetona = MQ135.readSensor(); // Sensor will read PPM concentration using the model, a and b values set previously or from the setup
  
  //Read the sensor and print in serial port
  
  
  Serial.print("| "); Serial.print(MQ2Lecture);
  Serial.print("   |   "); Serial.print(MQ7Lecture);
  Serial.print("   |   "); Serial.print(Alcohol);
  Serial.print("   |   "); Serial.print(CO2 + 400); 
  Serial.print("   |   "); Serial.print(Tolueno); 
  Serial.print("   |   "); Serial.print(NH4); 
  Serial.print("   |   "); Serial.print(Acetona);
  Serial.println("   |"); 

   delay(500); //Sampling frequency
}