Touch Me Not and Follow me ROBOT using l293d.

A funny to do robot, where it follow the user when you show something to the front sensor and move away from you when you show something to left and right sensors. This robot makes uses of an IR sensor and the logic behind the L293d motor driver, this is non programming robot hence there is no need for the microcontroller.

Circuit diagram for the robot

circuit diagram for the IR sensor

How to make ir sensor and how it works explained in the video

Flame Following robot using L293D motor driver

A Flame following robot, This example is a simple Flame follower where it used L293D Motor driver and IR 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. 

circuit diagram for flame following robot

circuit diagram for the flame sensor

The above video explain how the sensor works and how to make the sensor.

caution: please be careful when handling flame it may injurious to human :P

Light Following Robot Using L293D Motor IC (No programming)

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.