| Pin | Signal | Description | |-----|--------|-------------| | 1 | VCC | 5V DC input (some modules accept 3.3V–5V) | | 2 | GND | Ground | | 3 | AOUT | Analog output (0–5V proportional to gas concentration) |
delay(1000);
void loop() Gas alarm: "); Serial.println(gasDetected ? "No" : "YES"); Mh Mq Sensor Flying Fish Datasheet