This is a very simple line following robot I made recently. It follows a black line on a white surface. The circuit doesn’t use a micro-controller and is very simple, using only two ICs: a L-339 Quad comparator and a L293D Motor Driver. For sensing the line I have used two CNY-70 optical sensor, each of which consists of a photo transistor and IR LED pair. For supply I have used a 6V rechargeable lead acid battery. Initially I did try using standard AA batteries but they get drained quite fast as you can see in the “goof-ups” shown in the video…

Duration : 0:4:25

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