Saurav Chakraborty has shared his making of a very basic DIY follow-me robot that uses no microcontroller. It uses two sets of IR photodiodes and an IR LED to sense the presence of an object in fron of it. When the object is sensed, two DC motors are turned on using transistor switches and the robot moves forward. The robot can also follow left and right path based on the motion of the front object.
DIY follow-me robot
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