A Light following robot, This example is a simple light follower where it used L293D Motor driver and LDR based sensor. This robot does not require any programming, it uses the logic available in the motor driver (when the pins 12 and 14 are high) both the motor rotates in the forward direction, when the pin 7 is high it moves to the left , likewise when the pin 10 is high it moves to the right.
The figure below depicts overall connection of the L293D motor driver.
LDR based light sensor circuit
working principle and making of the sensor can find in the below video.
This is very simple to make and it not involves much cost really cheap , this can gives you an idea about how the l293D works and logic behind the IC and how to interface with the sensor , if you are getting starting with robotics this could be the perfect example to get start up with.
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