Simple and easy alcohol detector with Arduino nano

 

COMPONENT REQUIREMENTS:

1. Arduino Nano 2. LED Bulb 3. 220 ohm Resistor 4. Buzzer 5. Breadboard

PROCEDURE:

STEP - 1

    Place the require component carefully into the Breadboard.          

STEP - 2

     Connect the wire as the instructions given below.  

          * Arduino Nano 5V to MQ-3 sensor VCC

          * Arduino Nano GND to MQ-3 sensor GND

          * MQ-3 sensor DO to Arduino Nano pin D2

          * MQ-3 sensor AO TO Arduino Nano pin A1

          * Arduino Nano GND to Negative

          * Buzzer positive to Pin D3

          * Resistor to pin D4

          * Buzzer negative to Negative

STEP - 3

     Upload the source code into the Arduino board.

/*MQ-3 sensor with Arduino. created by FLY FACTORY. Read the code below and use it for any of your creations. */ #define sensorDigital 2 #define LED 3 #define buzzer 4 #define sensorAnalog A1 void setup() { pinMode(sensorDigital, INPUT); pinMode(LED, OUTPUT); pinMode(buzzer, OUTPUT); Serial.begin(9600); } void loop() { bool digital = digitalRead(sensorDigital); int analog = analogRead(sensorAnalog); Serial.print("Analog value : "); Serial.print(analog); Serial.print("t"); Serial.print("Digital value :"); Serial.println(digital); if (digital == 0) { digitalWrite(LED, HIGH); digitalWrite(buzzer, HIGH); } else { digitalWrite(LED, LOW); digitalWrite(buzzer, LOW); } }

STEP - 4

When the MQ-3 sensor detects alcohol , the LED will glow and buzzer will give alert sound.