This Robot use two motors control rear
wheels and the single front wheel is free. It has 4-infrared sensors on
the bottom for detect black tracking tape, when the sensors detected
black color, output of comparator, LM324 is low logic and the other the
output is high.
Microcontrollor AT89C2051 and H-Bridge
driver L293D were used to control direction and speed of motor.
Fig 1. Circuit diagram of my Robot.
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