Introduction: How to Build Obstacle Avoiding Robot for Beginners With Arduino Tutorial

Picture of How to Build Obstacle Avoiding Robot for Beginners With Arduino Tutorial

This Tutorial is for anyone getting started with arduino. We will be building an obstacle avoiding robot that uses an ultrasonic HC SR-04 sensor to detect objects and 2 continuous (360 degree) servos wired to an external battery supply. This project uses an Arduino Uno without motor shield. The code is not mine, but not sure who to give credit to as I combined about 4 different sketches I found online.

Comment with any questions and sorry I said UMMM about 3000 times, I get nervous on camera...

All parts and code can be found here :

CH340g driver for chinese arduino uno can be downloaded here:

Step 1:


YADHUKRISHNAN (author)2016-01-05

hey .. very nice vedio ..can i have the program plz i checkde with the link that you have mentioned bt unable to get the code

matthewh8 (author)YADHUKRISHNAN2016-01-12

Sorry about that just fixed the link, it's not pretty but it works for now.

BonnieS6 (author)2015-11-12

I made the robot and it worked finally :) BUT now I went to use it again after it sat for 4 or 5 days and I went to show it to someone, and it only goes in circles. Can you maybe explain to me what I did wrong that this could happen? Thank you so much.

matthewh8 (author)BonnieS62015-11-12

Yeah my bad, I should have mentioned somewhere to undo the power wire while its sitting I think the battery may have slowly drained. Change the batteries and it should work again no problem.

alyssamalagueno (author)2015-07-11

Can i use 2 dc motors instead of servos? Please reply

You can but you would need geared DC motors and you would have to connect the to the board through a motor shield or an h bridge set up

I am using futaba s3003 are they correct servos to use ???

I do not believe those servos will work, they need to be labeled continuous or 360 degree to work for this tutorial. However, with some modification you can make it rotate continuously to work for this tutorial. Check this out

oh sorry i used 180 degree now i am using 360 they are working

Nice, glad to hear that!

sorry it worked only once and now servos are not moving when changed with180 degree once they workrd but when i connect 360 degree once they are not working

hey math i am waiting for your response pls help me to figure out

matthewh8 (author)2015-07-05

I sent an email back a while ago. You didn't recieve it?

I will check

jaspreet singh123 (author)2015-07-05

waiting for your reply

jaspreet singh123 (author)2015-06-30

i think connections are not wrong

did u watch that video ?

thx for telling me your email address .i will send my video on my drive

jaspreet singh123 (author)2015-07-02

watched that video

matthewh8 (author)2015-06-29

I would check the connections again, make sure the trig and echo pins are not backwards.

i have made the connections many time but it works differently from your video .the robot do not moves forward . pls can i send a video on my drive pls tell me your email address .

jaspreet singh123 (author)2015-06-28

this code not works properly

are you getting a compiler error, or did I make a logic error?

it do not moves in front as compared to robot you made in your video

in the video that works like when nothing is front of it it runs in your video and in my case it only move when obstacle is near it and the it stops [sorry i am small to understand the code and explain you properly]

About This Instructable




Bio: My name is Matthew and I attend the University of Pittsburgh. Currently I am a senior, going for a bachelors in Information Science with a ... More »
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