#define sensor 34
#define buzzer 2

#define red 12
#define green 13
#define blue 14


void setup() {
  // Debug console
  Serial.begin(115200);
  pinMode(buzzer, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(red, OUTPUT);
  pinMode(blue, OUTPUT);
}

//Get the ultrasonic sensor values
void GASLevel() {
  int value = analogRead(sensor);
  Serial.println(value);
  value = map(value, 0, 4095, 0, 100);

  //4095 = 100 
  //2047 = 50
  
  Serial.println("-----");
  Serial.print("map:");
  Serial.println(value);

  if (value > 50) {
    digitalWrite(buzzer, HIGH);
    tone(buzzer, 100);
    digitalWrite(red, HIGH);
    digitalWrite(green, LOW);
    digitalWrite(blue, LOW);
  }
  if (value > 20 &&  value < 50) {
    digitalWrite(buzzer, LOW);
    noTone(buzzer);
    digitalWrite(green, HIGH);
    digitalWrite(red, LOW);
    digitalWrite(blue, LOW);
  }
  if (value < 20) {
    digitalWrite(buzzer, LOW);
    noTone(buzzer);
    digitalWrite(green, LOW);
    digitalWrite(red, LOW);
    digitalWrite(blue, HIGH);
  }
}

void loop() {
  GASLevel();
  delay(1000);
}