This document describes an Arduino code for an alcohol gas sensor. The code reads the analog input from an alcohol sensor connected to pin 0 and uses the sensor value to control the blink rate of an LED connected to pin 13, with a higher alcohol level resulting in a faster blink rate. The code was created by MQ-3 Alcohol Gas Sensor authors Nick Hardeman, Bruce Drummond, and Katherine Lee for user testing.

1. MQ-3 Alcohol Gas Sensor Nick Hardeman | Bruce Drummond | Katherine Lee

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3. The guts

4. The code // Alcohol Sensor // LED blink rate controlled by analog input from an alcohol sensor on pin 0 int alcVal = 0; int alcSensorPin = 0; int ledPin = 13; void setup() { Serial.begin(9600); pinMode(ledPin, OUTPUT); } void loop() { alcVal = analogRead(alcSensorPin); Serial.println(alcVal); digitalWrite(ledPin, HIGH); delay(alcVal); digitalWrite(ledPin, LOW); delay(alcVal); }

5. User testing