OBSTACLE AVOIDING ROBOT USING L293 Motor Driver shield

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 Obstacle Avoiding Robot Using Arduino UNO

Build a smart robotic car that automatically detects and avoids obstacles using an ultrasonic sensor. This beginner-friendly robotics project is perfect for learning automation, sensors, and embedded systems.

The robot uses Arduino Uno as the main controller and an HC-SR04 to measure distance.

 Components Needed

  • Arduino Uno

  • HC-SR04

  • L293D Motor Driver Shield

  • 2 or 4 DC Motors

  • Robot Chassis

  • Wheels

  • Jumper Wires

  • Battery (7.4V–12V recommended)

 Working Principle

  1. The ultrasonic sensor continuously measures the distance ahead.

  2. If no obstacle is detected → Robot moves forward.

  3. If an obstacle is closer than 15 cm:

    • Robot stops

    • Turns left or right

    • Continues moving forward

All decisions are controlled by the Arduino.

 Ultrasonic Sensor Working

The HC-SR04 sensor works using sound waves.

Step-by-Step Process:

1️⃣ Trig Pin sends ultrasonic pulses.
2️⃣ Sound waves travel and hit an obstacle.
3️⃣ Echo Pin receives the reflected signal.
4️⃣ Arduino measures the time taken.
5️⃣ Distance is calculated using a formula.

 Distance Calculation Formula

distance = (time × speed of sound) / 2

Speed of sound:

  • 343 m/s

  • 0.0343 cm/µs

Division by 2 is needed because the sound travels to the object and back.

 Basic Connection Overview

Ultrasonic Sensor:

  • VCC → 5V

  • GND → GND

  • Trig → Arduino Pin 9

  • Echo → Arduino Pin 10

Motor Driver:

  • Motor pins → DC motors

  • IN pins → Arduino digital pins

  • Power → Battery supply

 Sample Arduino Code

const int trigPin = 9;
const int echoPin = 10;

long duration;
int distance;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
}

void loop() {
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);

  distance = duration * 0.0343 / 2;

  Serial.print("Distance: ");
  Serial.println(distance);

  if (distance > 15) {
    moveForward();
  } else {
    stopRobot();
    turnRight();
  }

  delay(500);
}

void moveForward() {
  // Add motor control logic
}

void stopRobot() {
  // Stop motors
}

void turnRight() {
  // Turning logic
}

 Applications

✅ Autonomous robots
✅ Warehouse automation
✅ Smart delivery robots
✅ Robotics competitions
✅ STEM education projects
✅ Beginner AI navigation systems

BEGINNER PROJECTS (Foundation Skills)

  1. Ultrasonic Distance Measurement
  2. Traffic Light Simulation with 7-Segment Display
  3. 7-Segment Display Counter
  4. Kids Piano Circuit (8-Key Version)
  5. 16×2 LCD Display with Text Output
  6. LCD I2C to Arduino UNO
  7. Temperature Measurement using Arduino UNO
  8. LDR Controlled Street Light

INTERMEDIATE PROJECTS (Build Your Skills)

  1. Servo Motor Control Using Potentiometer
  2. DC Motor Speed Control
  3. Temperature Controlled Fan
  4. PIR Based Theft Alert System
  5. LPG Gas Leakage Detection System
  6. Automatic Door Locking System
  7. Soil Moisture Based Automatic Watering System
  8. Simple Digital Clock using Arduino UNO
  9. Automatic Voting Machine (EVM)
  10. Joystick Control using Arduino Uno
  11. RGB Lamp Control using Arduino Uno

    ADVANCED PROJECTS (Master Level)

    1. Home Automation Using Arduino UNO
    2. Bluetooth RC Car using Arduino Uno
    3. Obstacle Avoiding Robot
    4. Line Follower Robot
    5. Radar System Using Arduino UNO
    6. Automatic Parking System
    7. Bi-Directional People Counter using Arduino Uno 
    8. Automatic Plant Watering System
    9. NeoPixel LED Ring Control using Arduino Uno
    10. Smart Gloves for Bedridden People

      ROBOTICS & MOTION PROJECTS

      1. RC Car Using L293D Motor Driver
      2. Robot Arm and Leg Control Using Servo
      3. Smart Irrigation System using Arduino Uno


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