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- /* MQ-3 Alcohol Sensor Circuit with Arduino */
- const int AOUTpin=0;//the AOUT pin of the alcohol sensor goes into analog pin A0 of the arduino
- const int DOUTpin=8;//the DOUT pin of the alcohol 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 alcohol sensor's AOUT pin
- limit= digitalRead(DOUTpin);//reads the digital value from the alcohol sensor's DOUT pin
- Serial.print("Alcohol value: ");
- Serial.println(value);//prints the alcohol 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
- }
- }
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