Published November 15, 2017

Arduino Uno Autonomous Car

A car that avoids objects while led lights are activated.

IntermediateFull instructions provided33,704

Things used in this project

Hardware components

Arduino UNO

Ultrasonic Sensor - HC-SR04 (Generic)

Breadboard (generic)

Jumper wires (generic)

LED (generic)

OpenBuilds Delrin V Wheel Kit

RFduino Battery Shield

Hand tools and fabrication machines

Hot glue gun (generic)

Story

I am currently in a robotics class learning how to program and make different kinds of robots that do different actions. I made a Arduino car that can sense things in front of it avoiding the obstacle while LED lights are flashing. It works by using ultrasonic sensors to avoid objects by using servo motors.

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Code

Arduino Code

#define trigPin 12
#define echoPin 13

int n; 
int duration, distance;

String readString;

#include <Servo.h> 
Servo myservo1;  // create servo object to control servo 
Servo myservo2;

void setup() {
  Serial.begin(9600);
  myservo1.attach(8); // assigns the servo to a pin
  myservo2.attach(9);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(3, OUTPUT);
}

void loop() {
  digitalWrite(trigPin, HIGH);
  _delay_ms(500);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
        
  if (distance < 40) { // this is the distance which the rover has to stop
    digitalWrite(3, HIGH);
    myservo1.write(n); // controls the direction of the motors
    myservo2.write(180-n);
   delay(1000);  // how long the wheels spin
   myservo1.write(n);
   myservo2.write(90-n);
   delay(500);
}
  else { // what the rover will do if it doen't sense anything
    digitalWrite(3, LOW);
    myservo1.write(180-n);
    myservo2.write(n);
}
}