// This code from https://create.arduino.cc/projecthub/Aritro/smoke-detection-using-mq-2-gas-sensor-79c54a

//Modified by Salama for Fab Academy 2018, Input Devices week. Changed pins and removed the code for buzzer 


#include <SoftwareSerial.h>

int redLed = 2;
int greenLed = 3;

int smokeA0 = 7;
// Your threshold value
int sensorThres = 400;
SoftwareSerial myserial(1,0);

void setup() {
  pinMode(redLed, OUTPUT);
  pinMode(greenLed, OUTPUT);

  pinMode(smokeA0, INPUT);
  myserial.begin(9600);
}

void loop() {
  int analogSensor = analogRead(smokeA0);

  myserial.print("Pin A0: ");
  myserial.println(analogSensor);
  // Checks if it has reached the threshold value
  if (analogSensor > sensorThres)
  {
    digitalWrite(redLed, HIGH);
    digitalWrite(greenLed, LOW);

  }
  else
  {
    digitalWrite(redLed, LOW);
    digitalWrite(greenLed, HIGH);

  }
  delay(100);
}