// Static Variables

int smokeSensor = A0;      // Smoke sensor pin
int buzzer =  13;       // Buzzer pin

// Dynamic variables
int smokeValue = 0;  // Value read in by the smoke sensor

void setup() {
  // Initiates the buzzer pin as OUTPUT
  pinMode(buzzer, OUTPUT);
}

void loop() {
  // Read the analogical value from the sensor and store it as %
  smokeValue = analogRead(smokeSensor);
  smokeValue = map(smokeValue,0,1023,0,100);
  // Short wait
  delay(50);
  // If the smoke level is too high, activate the alarm
  if (smokeValue > 60) {
    digitalWrite(buzzer, HIGH);
  }
  else {
    digitalWrite(buzzer, LOW);
  }
}