In this section, we will test an MQ135 sensor which can detect smoke. This could also be used in a home to detect a gas leak. In this case, we will use it to detect smoke.
In home automation systems, putting all the sensors to detect something at home, we measure the real world: in this case we used the MQ135 sensor which can detect gas and smoke, as shown in the following image:
In the following code, we explain how program and detect smoke using the gas sensor:
const int sensorPin= 0;
const int buzzerPin= 12;
int smoke_level;
void setup() {
Serial.begin(115200);
pinMode(sensorPin, INPUT);
pinMode(buzzerPin, OUTPUT);
}
void loop() {
smoke_level= analogRead(sensorPin);
Serial.println(smoke_level);
if(smoke_level > 200){
digitalWrite(buzzerPin, HIGH);
}
else{
digitalWrite(buzzerPin, LOW);
}
}
If it doesn't detect...