Introduction

This experiment demonstrates how to measure alcohol content in the air using the MQ-303A sensor.

Components Needed

• MQ-303A Alcohol Sensor
• Arduino
• Jumper Wires

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Circuit Setup

1. Connect the VCC and GND pins of the MQ-303A to the 5V and GND on Arduino.
2. Connect the analog output pin of the MQ-303A to an analog input pin (e.g., A0) on Arduino.

The MQ-303A sensor will measure the alcohol concentration in the air and send the data to the Arduino.

Code for Alcohol Content Detection

Upload the following code to your Arduino to measure the alcohol content in the air:

const int alcoholPin = A0;

void setup() {
  Serial.begin(9600);
}

void loop() {
  int alcoholLevel = analogRead(alcoholPin);
  Serial.print("Alcohol Concentration: ");
  Serial.println(alcoholLevel);
  delay(1000);
}
            

Explanation

The MQ-303A sensor detects alcohol in the air, converting the detected concentration into an analog value which is then read by the Arduino.

Troubleshooting

• Ensure the sensor is properly connected to the Arduino.
• If readings are inconsistent, check sensor calibration and check for interference from other gases.