Editing Alcohol Sensor Based on Gas-Sensitive Resistive Materials (section)

==== Software Design ====
The program is implemented using the Arduino IDE. Its main function is to read sensor data, display the result, and control the alarm outputs.
The analog signal from the MQ-3 sensor is read using the analogRead() function. The value is then scaled and displayed on the LCD.
At the same time, the system compares the value with a threshold (set to 30 in this project). Based on this comparison, the LED and buzzer are controlled.
A simplified version of the main logic is shown below:
int value = analogRead(A0) / 10;
lcd.setCursor(0, 0); lcd.print("alcohol:"); lcd.print(value); lcd.print("%");
if (value > 30) { digitalWrite(2, HIGH);	// LED ON digitalWrite(3, LOW);	// Buzzer state
} else { digitalWrite(2, LOW);	// LED OFF digitalWrite(3, HIGH);	// Buzzer state
}
The system updates once every second, allowing continuous monitoring of alcohol levels.