Arduino Driver Drowsiness Detection System using IR Sensor with Alarm

1. Introduction

Driver fatigue is one of the major causes of road accidents, especially during long-distance and night driving. To improve road safety, it is important to detect drowsiness at an early stage and alert the driver immediately.

This project presents a simple and effective Arduino-based Driver Drowsiness Detection System using an IR sensor. The system monitors the driver’s eye activity and detects if the eyes remain closed for a prolonged period.

When drowsiness is detected, the system triggers a buzzer alarm and LED indication to alert the driver in real time. This helps in preventing accidents and ensures safer driving conditions.

This project is easy to build, cost-effective, and serves as a great introduction to smart safety systems using Arduino.

2. Components Required

Arduino UNO
IR Sensor Module
Buzzer
LED
220Ω Resistor
Breadboard
Jumper Wires

3. Circuit Diagram / Connections

🔌 IR Sensor:

VCC → 5V
GND → GND
OUT → Pin 2

🔔 Buzzer:

Positive → Pin 8
Negative → GND

💡 LED:

Anode → Pin 7 (via resistor)
Cathode → GND

4. Circuit Working

The IR sensor is placed near the driver's eye area.

When the eye is open, IR reflection is detected
When the eye is closed, reflection changes

Logic:

If eye closed for a short time → normal blink
If eye closed for longer duration → drowsiness detected

Arduino processes this and triggers:

Buzzer alarm
LED indication

5. Code


int irSensor = 2;
int buzzer = 8;
int led = 7;

unsigned long eyeClosedTime = 0;
int thresholdTime = 2000; // 2 seconds

void setup() {
  pinMode(irSensor, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int eyeState = digitalRead(irSensor);

  if (eyeState == LOW) { // Eye closed
    if (eyeClosedTime == 0) {
      eyeClosedTime = millis();
    }

    if (millis() - eyeClosedTime > thresholdTime) {
      digitalWrite(buzzer, HIGH);
      digitalWrite(led, HIGH);
    }
  } else { // Eye open
    eyeClosedTime = 0;
    digitalWrite(buzzer, LOW);
    digitalWrite(led, LOW);
  }

  delay(100);
}

6. Code Explanation

digitalRead(irSensor) reads eye status
millis() tracks how long the eye is closed
If closed > 2 seconds:
- Buzzer ON
- LED ON
If eye opens:
- Timer resets
- Alarm OFF

7. Output

✅ Normal Condition:

Eye blinking normally
No alarm

⚠️ Drowsiness Detected:

Eye closed for long
Buzzer sounds
LED glows

8. Applications

Driver safety systems
Smart vehicles
Industrial machine operators
Security monitoring

9. Advantages

Simple and low cost
Easy to implement
Real-time detection
Portable system

10. Disadvantages

Not 100% accurate
Sensitive to placement
IR sensor limitations

11. Future Scope / Improvements

Use camera with AI (face/eye detection)
Add GSM alert system
Integrate with vehicle control system
Use wearable sensor for better accuracy

12. Conclusion

The Arduino-based Driver Drowsiness Detection System is a simple yet effective safety solution designed to reduce accidents caused by driver fatigue. By continuously monitoring eye closure using an IR sensor, the system can quickly detect drowsiness and alert the driver through a buzzer and LED indication.
This project demonstrates how basic sensors and microcontrollers can be used to solve real-world problems. Although it is a beginner-level implementation, it can be further enhanced with advanced technologies like AI-based vision systems and IoT integration for improved accuracy and reliability.
Overall, this system serves as a great learning project for students and a foundational step toward developing smart and intelligent vehicle safety systems.

Basic Electronics for Beginners

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