Gas sensor mq-8

Sensor mq-8 är en gassensor som detekterar koncentrationen eller närvaron av gaser i luften. Den kan mäta koncentrationer mellan 200 och 10000 ppm. Sensorn används främst till larm på grund av dess sensivitet och snabba responstid.

/* MQ-8 Hydrogen Gas Sensor Circuit with Arduino */

const int AOUTpin=0;//the AOUT pin of the hydrogen sensor goes into analog pin A0 of the arduino
const int DOUTpin=8;//the DOUT pin of the hydrogen sensor goes into digital pin D8 of the arduino
const int ledPin=13;//the anode of the LED connects to digital pin D13 of the arduino

int limit;
int value;

void setup() {
Serial.begin(115200);//sets the baud rate
pinMode(DOUTpin, INPUT);//sets the pin as an input to the arduino
pinMode(ledPin, OUTPUT);//sets the pin as an output of the arduino
}

void loop()
{
value= analogRead(AOUTpin);//reads the analaog value from the hydrogen sensor's AOUT pin
limit= digitalRead(DOUTpin);//reads the digital value from the hydrogen sensor's DOUT pin
Serial.print("Hydrogen value: ");
Serial.println(value);//prints the hydrogen value
Serial.print("Limit: ");
Serial.print(limit);//prints the limit reached as either LOW or HIGH (above or underneath)
delay(100);
if (limit == HIGH){
digitalWrite(ledPin, HIGH);//if limit has been reached, LED turns on as status indicator
}
else{
digitalWrite(ledPin, LOW);//if threshold not reached, LED remains off
}
}

Koden som jag använde för att få sensorn att fungera hittade jag på http://www.learningaboutelectronics.com/Articles/MQ-8-hydrogen-sensor-circuit-with-arduino.php