This is a simple and easy to make and use, obstacle avoiding robot. It uses Arduino as it's main controller. It uses the ultrasonic sensor to detect the objects ahead. And it uses the L298N motor driver circuit to power the motors.
Full written tutorial and parts required : https://prakashganesan.net/?p=398
Check out my website for some really cool blogs about things that fascinate me in life. You'll also find other projects like this and research papers as well. https://prakashganesan.net/
Music credits: Bitch Lasagna (Epic sad Heroic Orchestral) - TheDancingFishstick, PewDiePie and Party in Backyard.
https://www.youtube.com/watch?v=zIMCAwsV3VY