Gas Sensor

https://imgur.com/a/4NgJyUG



int LED = A1;
const int gas = 0;
int MQ2pin = A0;
void setup()
{
  Serial.begin(9600);
}
void loop()
{
  float sensorValue, MQ2pin;
  sensorValue = analogRead(MQ2pin); // read analog input pin 0
  if (sensorValue >= 470)
  {
    digitalWrite(LED, LOW);
    Serial.print(sensorValue);
    Serial.println(" |SMOKE DETECTED");
  }
  else
  {
    digitalWrite(LED, HIGH);
    Serial.println("Sensor Value: ");
    Serial.println(sensorValue);
  }
  delay(1000);
}
float getsensorValue(int pin)
{
  return (analogRead(pin));
}