Sensor MQ-3 เซ็นเซอร์สำหรับตรวจวัดระดับแอลกอฮอล์ในอากาศ

It is used for on-site inspection of motor vehicle drivers and other non-drinking operators, and is also used for the detection of ethanol vapor in other places.

ตัวอย่าง code

const int AOUTpin=0;  // analog pin A0 of the arduino

const int DOUTpin=8;  //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);

pinMode(DOUTpin, INPUT);

pinMode(ledPin, OUTPUT);

}

void loop()

{

value= analogRead(AOUTpin);

limit= digitalRead(DOUTpin);

Serial.print(“Alcohol value: “);

Serial.println(value);

Serial.print(“Limit: “);

Serial.print(limit);

delay(100);

if (limit == LOW){

digitalWrite(ledPin, HIGH);

}

else{

digitalWrite(ledPin, LOW);

}

}