/* The source of the program is taken from several reference sources, then I modify it as needed */

#include  <Wire.h>
#include <DFRobot_DHT11.h>
#include <AccelStepper.h>
#define DHT11_PIN 3
#define RL 47  //The value of resistor RL is 47K
#define m -0.263 //Enter calculated Slope 
#define b 0.42 //Enter calculated intercept
#define Ro 24 //Enter found Ro value
#define MQ_sensor 4 //Sensor is connected to A4

// Include the AccelStepper library:
#include <AccelStepper.h>

// Define stepper motor connections and motor interface type. Motor interface type must be set to 1 when using a driver:
#define dirPin 6
#define stepPin 7
#define enPin 0
#define motorInterfaceType 1
#define irPin 5
#define ledPinR 11
#define ledPinG 13
#define ledPinB 12
#define BuzPin 10

int count=0;
// Create a new instance of the AccelStepper class:
AccelStepper stepper = AccelStepper(motorInterfaceType, stepPin, dirPin);
DFRobot_DHT11 DHT;
void setup() {
  Serial.begin(9600); //Initialise serial COM for displaying the value
  // Set the maximum speed and acceleration:
  stepper.setMaxSpeed(500);
  stepper.setAcceleration(100);
  pinMode(enPin, OUTPUT);
  pinMode(irPin, INPUT);
  pinMode(ledPinR, OUTPUT);
  pinMode(ledPinG, OUTPUT);
  pinMode(ledPinB, OUTPUT);
  pinMode(BuzPin, OUTPUT);
  digitalWrite(ledPinR, LOW); //led strip off
  digitalWrite(ledPinG, LOW);  //led Green on
  digitalWrite(ledPinB, HIGH); //led Blue off
  digitalWrite(BuzPin, HIGH); //buzzer off
  digitalWrite(enPin, HIGH);  
}

void loop() {
    float VRL; //Voltage drop across the MQ sensor
  float Rs; //Sensor resistance at gas concentration 
  float ratio; //Define variable for ratio
  DHT.read(DHT11_PIN);
  
  VRL = analogRead(MQ_sensor)*(5.0/1023.0); //Measure the voltage drop and convert to 0-5V
  Rs = ((5.0*RL)/VRL)-RL; //Use formula to get Rs value
  ratio = Rs/Ro;  // find ratio Rs/Ro
  float ppm = pow(10, ((log10(ratio)-b)/m)); //use formula to calculate ppm
  Serial.print("NH3(ppm) = "); //Display a ammonia in ppm
  Serial.print(ppm);
  Serial.print("   Temp(\u00b0C) = ");
  Serial.print(DHT.temperature);
  Serial.print("   Humi(%) = ");
  Serial.println(DHT.humidity);
  Serial.println("Empty-Ready for use");
   int irSensorValue = digitalRead(irPin);
       if(irSensorValue==1){
       digitalWrite(ledPinR, LOW); //led strip off
       digitalWrite(ledPinG, HIGH);  //led Green of
       digitalWrite(ledPinB, LOW); //led Blue on
       digitalWrite(BuzPin, HIGH); //buzzer off
        Serial.println("In USE");
          count = 1;
          delay (5000);
       }
        else {
        

          if (count==1){
        
  digitalWrite(enPin, LOW);
        digitalWrite(ledPinG, HIGH);  //led Green of
       digitalWrite(ledPinB, LOW); //led Blue on 
       digitalWrite(ledPinR, HIGH); //led strip on
       Serial.println("Cleaning");
  // Set the target position:
  stepper.moveTo(3600);
  // Run to target position with set speed and acceleration/deceleration:
  stepper.runToPosition();

  delay(1000);
       

  // Move back to zero:
  stepper.moveTo(0);
  stepper.runToPosition();
 
  delay(1000);
  count=0;

        digitalWrite(ledPinR, HIGH);
       digitalWrite(ledPinB, HIGH);

               
        digitalWrite(BuzPin, LOW);
        digitalWrite(ledPinB, LOW);
        delay(500);  
        digitalWrite(BuzPin, HIGH);
        digitalWrite(ledPinB, HIGH);
        Serial.println("Cleaning");
        delay(700);
        digitalWrite(BuzPin, LOW);
        digitalWrite(ledPinB, LOW);
        delay(500);  
        digitalWrite(BuzPin, HIGH);
        digitalWrite(ledPinB, HIGH);
        Serial.println("Cleaning");
        delay(700);        digitalWrite(BuzPin, LOW);
        digitalWrite(ledPinB, LOW);
        delay(500);  
        digitalWrite(BuzPin, HIGH);
        digitalWrite(ledPinB, HIGH);
        Serial.println("Cleaning");
        delay(700);
        digitalWrite(ledPinB, LOW);
        delay(500);  
        digitalWrite(BuzPin, HIGH);
        digitalWrite(ledPinB, HIGH);
        Serial.println("Finish");
        delay(1000);
        
}
}
digitalWrite(enPin, HIGH);  
       digitalWrite(ledPinR, LOW); //led strip off
       digitalWrite(ledPinG, LOW);  //led Green on
       digitalWrite(ledPinB, HIGH); //led Blue off
       digitalWrite(BuzPin, HIGH); //buzzer off
delay (300);
}