Here is how you can make a very simple follow me robot. It can sense the presence of object ,to be followed, using Infra-Red ( IR ) sensor. There are one IR LED and two IR photo diode (with back IR Filter) . When the IR gets reflected from a nearby object and back to both the receivers, the transistors switches ON both the motors and the robot moves forward. If the object moves left or right then any one motor gets switched on and the robot takes turn. 
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