Arduino-Powered Autonomous Obstacle Avoidance Robot with Servo Control

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Arduino-Powered Autonomous Obstacle Avoidance Robot with Servo Control

The Arduino-Powered Autonomous Obstacle Avoidance Robot is an intelligent robotics project that automatically detects and avoids obstacles using an Arduino Uno. This smart robot combines an ultrasonic sensor, servo motor scanning, and motor driver control to navigate without human intervention.

It is an ideal DIY robotics project for beginners, STEM learners, and robotics competition participants who want to understand how autonomous systems function in real time.

 Project Overview

This autonomous robot uses an HC-SR04 ultrasonic sensor mounted on a servo motor to scan its surroundings across a 180° range. The servo rotates the sensor left and right, allowing the robot to measure distances in multiple directions.

An L298N Motor Driver Module controls the DC motors, enabling forward, backward, left, and right movement based on obstacle detection logic.

 How It Works

1️⃣ The ultrasonic sensor continuously measures the distance to nearby objects.

2️⃣ The servo motor rotates the sensor to scan right and left for better path selection.

3️⃣ The Arduino processes the distance data.

4️⃣ If an obstacle is detected within 15 cm:

  • The robot stops

  • Moves backward slightly

  • Scans both directions

  • Chooses the clearer path

5️⃣ If no obstacle is detected:

  • The robot moves forward autonomously

This creates a fully automatic obstacle avoidance system.

Components Used

  • Arduino UNO

  • HC-SR04 Ultrasonic Sensor

  • Servo Motor (for scanning)

  • L298N Motor Driver Module

  • DC Motors with Wheels

  • Robot Chassis

  • Battery Pack

  • Jumper Wires

 Key Features

✅ Fully autonomous navigation
✅ Real-time obstacle detection
✅ 180° environmental scanning using servo
✅ Smooth motor acceleration control
✅ Expandable with Bluetooth, IoT, or camera modules

Learning Outcomes

  • Interfacing ultrasonic sensors with Arduino

  • Servo motor control using PWM

  • Motor driver integration and DC motor control

  • Embedded C/C++ programming logic

  • Decision-making algorithms in robotics

  • Basics of automation and autonomous systems

 Applications

  • Robotics learning projects

  • STEM education demonstrations

  • Science fair exhibits

  • DIY automation experiments

  • Autonomous vehicle prototype models

  • Robotics competitions

Code:

#include <AFMotor.h>  
#include <NewPing.h>
#include <Servo.h>
 
#define TRIG_PIN A0
#define ECHO_PIN A1
#define MAX_DISTANCE 200
#define MAX_SPEED 190
#define MAX_SPEED_OFFSET 20
 
NewPing sonar(TRIG_PIN, ECHO_PIN, MAX_DISTANCE);
 
AF_DCMotor motor1(1, MOTOR12_1KHZ);
AF_DCMotor motor2(2, MOTOR12_1KHZ);
AF_DCMotor motor3(3, MOTOR34_1KHZ);
AF_DCMotor motor4(4, MOTOR34_1KHZ);
Servo myservo;  
 
boolean goesForward=false;
int distance = 100;
int speedSet = 0;
 
void setup() {
 
  myservo.attach(10);  
  myservo.write(115);
  delay(2000);
  distance = readPing();
  delay(100);
  distance = readPing();
  delay(100);
  distance = readPing();
  delay(100);
  distance = readPing();
  delay(100);
}
 
void loop() {
 int distanceR = 0;
 int distanceL =  0;
 delay(40);
 
 if(distance<=15)
 {
  moveStop();
  delay(100);
  moveBackward();
  delay(300);
  moveStop();
  delay(200);
  distanceR = lookRight();
  delay(200);
  distanceL = lookLeft();
  delay(200);
 
  if(distanceR>=distanceL)
  {
    turnRight();
    moveStop();
  }else
  {
    turnLeft();
    moveStop();
  }
 }else
 {
  moveForward();
 }
 distance = readPing();
}
 
int lookRight()
{
    myservo.write(50);
    delay(500);
    int distance = readPing();
    delay(100);
    myservo.write(115);
    return distance;
}
 
int lookLeft()
{
    myservo.write(170);
    delay(500);
    int distance = readPing();
    delay(100);
    myservo.write(115);
    return distance;
    delay(100);
}
 
int readPing() {
  delay(70);
  int cm = sonar.ping_cm();
  if(cm==0)
  {
    cm = 250;
  }
  return cm;
}
 
void moveStop() {
  motor1.run(RELEASE);
  motor2.run(RELEASE);
  motor3.run(RELEASE);
  motor4.run(RELEASE);
  }
 
void moveForward() {
 
 if(!goesForward)
  {
    goesForward=true;
    motor1.run(FORWARD);      
    motor2.run(FORWARD);
    motor3.run(FORWARD);
    motor4.run(FORWARD);    
   for (speedSet = 0; speedSet < MAX_SPEED; speedSet +=2)
   {
    motor1.setSpeed(speedSet);
    motor2.setSpeed(speedSet);
    motor3.setSpeed(speedSet);
    motor4.setSpeed(speedSet);
    delay(5);
   }
  }
}
 
void moveBackward() {
    goesForward=false;
    motor1.run(BACKWARD);      
    motor2.run(BACKWARD);
    motor3.run(BACKWARD);
    motor4.run(BACKWARD);  
  for (speedSet = 0; speedSet < MAX_SPEED; speedSet +=2)
  {
    motor1.setSpeed(speedSet);
    motor2.setSpeed(speedSet);
    motor3.setSpeed(speedSet);
    motor4.setSpeed(speedSet);
    delay(5);
  }
}  
 
void turnRight() {
  motor1.run(FORWARD);
  motor2.run(FORWARD);
  motor3.run(BACKWARD);
  motor4.run(BACKWARD);    
  delay(500);
  motor1.run(FORWARD);      
  motor2.run(FORWARD);
  motor3.run(FORWARD);
  motor4.run(FORWARD);      
}
 
void turnLeft() {
  motor1.run(BACKWARD);    
  motor2.run(BACKWARD);  
  motor3.run(FORWARD);
  motor4.run(FORWARD);  
  delay(500);
  motor1.run(FORWARD);    
  motor2.run(FORWARD);
  motor3.run(FORWARD);
  motor4.run(FORWARD);
}  

IOT & SMART SYSTEM PROJECTS

  1. IoT Weather Monitoring System (NodeMCU ESP8266 + DHT11 + Rain Sensor)
  2. ESP8266 NodeMCU Smart Health & Environment Monitoring System with Pulse, Temperature and Motion Sensors
  3. ESP32 Wi-Fi Weight Sensor with HX711
  4. Smart RFID Access Control System Using ESP32 Dev Board and UHF RFID Reader Module
  5. Smart IoT Motor Control System Using ESP32 Dev Board and L298N Motor Driver Module
  6. Smart Waste Management System Using Arduino Nano, Ultrasonic Sensor & GSM Module – Solar Powered IoT Solution
  7. Raspberry Pi Zero W and GSM SIM900 Based Ultrasonic Distance Measurement System
  8. Arduino UNO Smart Surveillance System with ESP8266 WiFi, PIR Motion Sensor & Camera Module
  9. Arduino UNO Environmental Monitoring System with OLED & 16x2 I2C LCD Display
  10. Arduino UNO-Based Smart Home Automation System with Flame and IR Sensors 
  11. Arduino Nano-Based Landslide Detection System with GSM Alerts – Smart Disaster Monitoring Project
  12. Arduino Nano Rain-Sensing Stepper Motor System
  13. Arduino Based Automatic Tire Inflator Using Pressure Sensor, Relay Module and LCD Display
  14. Arduino-Based Automatic Cooker Using Servo Motors, DC Stirrer Motor, Temperature Sensor and Relay-Controlled Heater
  15. Arduino Sketch for Plastic Bottle and Can Reverse Vending Machine

 TRAFFIC & SMART CITY PROJECTS
  1. RFID-Based Smart Traffic Control System (Arduino Mega)
  2. Arduino UNO Traffic Light Control System – Smart LED Signal Project
  3.  Arduino UNO Controlled Traffic Light System with Joystick Interface

ROBOTICS PROJECTS
  1. Arduino UNO Smart Obstacle Avoiding Robot (Ultrasonic + IR + GSM)
  2. Arduino-Powered Autonomous Obstacle Avoidance Robot with Servo Control
  3. Arduino Nano Bluetooth Controlled Line Follower Robot Using L298N Motor Driver
  4. Arduino UNO Bluetooth Controlled 4WD Robot Car Using L298N Motor Driver
  5. Arduino UNO Multi-Sensor Obstacle Avoidance & Bluetooth Controlled Robot Car Using L298N
  6. Raspberry Pi Motor Control Robot (L298N + Li-ion)
  7. RC Car Simulation with L298N Motor Driver and Joystick Control using Arduino (CirkitDesign Simulation)
  8. Raspberry Pi Robotic Arm Control System with Camera Module and Motor Driver – Smart Automation & Vision-Based Robotics Project
  9. ESP32-Based 4WD Robot Car Using Dual L298N Motor Drivers – Circuit Diagram and IoT Control Project

LORA & WIRELESS COMMUNICATION PROJECTS
  1. Arduino LoRa Communication Project Using Adafruit RFM95W LoRa RadioArduino Nano with RFM95 SX1276 LoRa
  2. Arduino Nano with RFM95 LoRa SX1276 Module – Long Range Wireless Communication Project
  3. Arduino Nano Digital Clock Using DS3231 RTC and TM1637 4-Digit Display – Circuit Diagram and Project Guide

 LED, LIGHTING & DISPLAY PROJECTS
  1. Arduino UNO Controlled NeoPixel Ring Light Show
  2. Wi-Fi Controlled NeoPixel Ring (ESP8266)
  3. Chained NeoPixel Rings with Arduino – Addressable RGB LED Control Project
  4. Arduino Nano-Controlled Lighting System with Gesture and Sound Interaction
  5. Raspberry Pi GPIO Multi-LED Control System – Beginner-Friendly Embedded Electronics Project
  6. 4 Channel Relay Module with Arduino UNO

 SENSOR & DETECTION PROJECTS
  1. Arduino UNO Color Sensor + Proximity System (TCS3200 + Inductive)
  2. Arduino Color Detection Project Using Adafruit TCS34725 RGB Color Sensor
  3. Arduino Gas Leakage Detection and Safety Alert System Using MQ-2 Gas Sensor
  4. MQ-135 Air Quality Detector Using Arduino | Cirkit Designer Simulation Project
  5. Pulse Sensor Using Arduino – Complete Guide with Simulation 
  6. HX711 Load Sensor Demo Using Arduino | Digital Weight Measurement Project
  7. Track Time with DS1307 RTC and Display on Arduino Uno with 16x2 LCD | Cirkit Designer Project
  8. Parking Sensor Simulator using Arduino Uno and HC-SR04 Ultrasonic Sensor

 FUN & INTERACTIVE PROJECTS
  1. Pong Game with Arduino UNO and OLED Display – Project Explanation
  2.   Arduino UNO Bluetooth-Controlled Servo Motor System
  3. Arduino UNO-Based Interactive Touch and Distance Sensing System with LED Indicators and Servo Control

 INDUSTRIAL / AUTOMATION PROJECTS
  1. Arduino UNO Smart Waste Sorting System Using Ultrasonic Sensor, Moisture Sensor, Servo, Stepper Motor and LCD
  2. Arduino-Based Smart Waste Segregation System Using Metal, Plastic and Moisture Sensors with Stepper and Servo Control
  3. ESP32-Based Digital Weighing Scale Using 50kg Load Cell, HX711 Module and 16x2 LCD Display

  4. Arduino-Based Smart Toll Gate Automation System with RFID, GSM, Ultrasonic Sensor and LCD Display

  5. Arduino-Based Automatic Pill Dispenser Machine with LCD Display, Servo Motor and Buzzer Reminder

  6. Arduino UNO Smart Water Quality Monitoring System with pH Sensor, Turbidity Sensor and LCD Display

  7. Arduino-Based Ocean Cleaning Boat Robot with Dual IBT-2 Motor Drivers and Conveyor Belt System

  8. IoT-Based Accident Detection and Health Monitoring System Using Raspberry Pi with GSM, GPS and Camera Integration

  9. Raspberry Pi RFID and Keypad Based Smart Door Lock System with LCD Display and L298N Motor Driver

  10. Smart Shopping Trolley Using Arduino UNO & RFID | Automatic Billing System

  11. Arduino UNO Based Automatic Liquid Hand Sanitizer & Soap Dispenser System

  12. Arduino Based Robotic Weeding Machine with Ultrasonic Obstacle Detection and L298N Motor Driver

  13. Arduino UNO Based Biometric Electronic Voting System with LCD Display and Fingerprint Authentication

  14. Arduino UNO Based Electronic Voting System with ILI9341 TFT Display






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