Introduction: Obstacle Avoiding Arduino Car

Picture of Obstacle Avoiding Arduino Car

Hello everyone I am sharing here what I make a Obstacles avoiding arduino car. I used here easily available material, these robo continue run forward until and unless any obstacle came in front of car so let's see and make ......

Step 1: Materials Required

Picture of Materials Required

1-Arduino uno board
2- HC-SR04 Ultrasonic sensor
3- 75 RPM L shape gear motor 2 nos.
4. Old CD drive case for chassis.
5. Bread board
6. Wheels
7. Jumper wires
8. Tools for work

Step 2: Assembly

Picture of  Assembly

First we assemble our all components, I share some pic to visualize how to assemble a car, you can do as you want just be sure ultrasonic sensor must be at most far front portion of your car, to avoid unnecessary disturbance in sensor reading.

Step 3: Wiring and Code

Picture of Wiring and Code

so now time to wire your car.
please read pic cearfully. make connection as shown in pic, I hope each and every wiring detail is covers in pic if any doubt pls feel free to contact.
must check your wiring before applying power....

now its time to upload code to give life to your car..

/* code for obstacles avoiding arxuino car

#define ECHOPIN 7

#define TRIGPIN 8

void setup(){


void loop()

digitalWrite(TRIGPIN, LOW);
digitalWrite(TRIGPIN, HIGH);
digitalWrite(TRIGPIN, LOW);

float distance = pulseIn(ECHOPIN, HIGH);
distance = distance/58;

if (distance >= 30)
{digitalWrite(11, HIGH);
digitalWrite(10, HIGH ;);
digitalWrite(9, LOW);


{digitalWrite(11, HIGH);
digitalWrite(10, LOW);
digitalWrite(9, HIGH);

Serial.println(" cm");


// code end

so this is code upload this to arduino board and let your car to move, in this code I keep safe distance of 30 cm you can modify as per your need.
so thats it I hope I provide much details , if some thing skip pls ask let do some thing creative and share what you make ....



AIP06 (author)2017-07-05

can you make a fritzing or some type of wiring that i can understand please


instructable123456789 (author)2017-03-15

cool nice project # follow me

EzzeldinH (author)2016-06-04

how to wire the ultrasonic sensor

Mr innovative (author)EzzeldinH2016-06-04

sensor vcc to arduino 5v
sensor gnd to arduino and
sensor ECHOPIN to arduino 7
sensor TRIGPIN to arduino 8

MNM_25-07 (author)Mr innovative2016-11-06

By Arduino 7 and Arduino 8, you mean the A7 and A8 pin right, Thank you

bigerboy654 (author)2016-10-12

Upload a video plzz

actually I disassembled it some days ago & haven't record any video, but I will surely help you in this feel free to ask anything happy to help you

you can mail me on

bigerboy654 (author)2016-10-10

And what are the sizes of the bread board

Color: White

- Solderless breadboard with 400 tie points
- Self-adhesive tape is included on the back
Dimensions: 3.27 in x 2.09 in x 0.35 in (8.3 cm x 5.3 cm x 0.9 cm)
Weight: 1.38 oz (39 g)

bigerboy654 (author)2016-10-10

Where can I buy or did you buy the materials?

please use this links to buy exact items

For Ultrasonic sensors----

For DC motors-----

For Wheels-------

For L293D IC----

For breadboard-------

EzzeldinH (author)2016-06-04

there is error compiling the code this is the message : Arduino: 1.7.10 (Windows 8.1), Board: "Arduino Uno"

sketch_jun04a.ino: In function 'void loop()':

sketch_jun04a.ino:32:23: error: expected ')' before ';' token

sketch_jun04a.ino:32:24: error: expected primary-expression before ')' token

sketch_jun04a.ino:32:24: error: expected ';' before ')' token

sketch_jun04a.ino: At global scope:

sketch_jun04a.ino:55:1: error: expected declaration before '}' token

Error compiling.

This report would have more information with

"Show verbose output during compilation"

enabled in File > Preferences.

Mr innovative (author)EzzeldinH2016-06-04

hello ezzel
copy past the code in arduino idea and reple the ``#define`` by ``int``
your problem get solve.
as you can see in very first two line of code. you find
#define ECHOPIN;
#define TRIGPIN;
Chang it like this.

and you know done compile seccessfully


About This Instructable




Bio: Electrical engineer by profession
More by Mr innovative:How to Make Record and Play Servo Based Robotic Arm How to Make Mini Home Made CNC Machine Arduino+28BJY-48 Stepper Motor28BYJ-48 Stepper Motor + Arduino + L293D Motor Shield + Processing Setup Test Run
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