MQ3 Alcohol Gas Sensor Module

The Alcohol Sensor Module is commonly used to detect alcohol vapors in breath or the environment. It's great for projects like DIY breathalyzers, safety systems, or drunk-driving prevention systems. The MQ3 alcohol sensor operates on 5V DC and consumes approximately 800mW. It can detect alcohol concentrations ranging from 25 to 500 ppm.

Technical Specifications:

• Operating Voltage: 5V DC
  
• Detection Range: 0.05mg/L – 10mg/L Alcohol in air
  
• Analog Output (A0): Varies with alcohol concentration
  
• Digital Output (D0): HIGH/LOW based on set threshold (adjustable)
  
• Preheat Time: 20 seconds to a few minutes for stable reading
  
• Heater Consumption: ~800mW

Pinouts:

Connection to Arduino:

Sample Code:

int mq3Pin = A0;  // Analog pin connected to A0 on MQ3 sensor

void setup() {
  Serial.begin(9600);  // Start Serial communication
}

void loop() {
  int sensorValue = analogRead(mq3Pin);  // Read analog value from MQ3
  Serial.print("Alcohol Sensor Value: ");
  Serial.println(sensorValue);  // Print the value to Serial Monitor
  delay(1000);  // Wait for 1 second before next read
}