const int gasPin = A0;      // GP26
const int greenLED = 14;    // GP14
const int redLED = 15;      // GP15
const int buzzer = 16;      // GP16

const int threshold = 500;

void setup() {
  pinMode(greenLED, OUTPUT);
  pinMode(redLED, OUTPUT);
  pinMode(buzzer, OUTPUT);

  Serial.begin(115200);
}

void loop() {
  int gasValue = analogRead(gasPin);

  Serial.print("Gas Value: ");
  Serial.println(gasValue);

  if (gasValue > threshold) {
    digitalWrite(greenLED, LOW);
    digitalWrite(redLED, HIGH);
    digitalWrite(buzzer, HIGH);
  } else {
    digitalWrite(greenLED, HIGH);
    digitalWrite(redLED, LOW);
    digitalWrite(buzzer, LOW);
  }

  delay(500);
}