Скачать или смотреть how to make a line follower robot without programming |CHECK-POINT Counter |Line Follower| TechyGuru

It is a machine that follows a line, either a black line on white surface or vise-versa. For Beginners it is usually their first robot to play with. In the following steps you will completely understand the concept of line follower.

WORKING OF IR SENSOR:

Generally IR rays will be reflected by white surface while black surface will absorb IR rays.In the line follower that we are going to build, both the IR sensors will be on the white surface . IR rays will be emitted and reflected back which will be detected by the Photo diode, in this state the IR sensor will send a HIGH digital signal ("1"). similarly when the sensor is on a black surface IR rays will be emitted and will not be reflected back which will be absorbed by the black surface, in this state the IR sensor will send LOW digital signal ("0"). Thus with these digital values 1 and 0 we can easily identify the state of the sensors.

COMPONENTS

1) IC7805 Voltage Regulator - 1

2) L293D Motor Driver - 1

3) IR LED pair - 2

4) 300-500rpm DC Motor - 2

5) Battery 9v-12v - 1

6) Chasis - 1

7) Castor wheel - 1

8) Wheels - 2

WORKING OF a MOTOR
We will be using two 500rpm DC motors here, you can use motors with different rpm as per your requirement. These motors will work when they are connected to any DC power source and the direction of rotation of the motor can be changed by changing the polarity of the source.

IC L293D will be used to control the motors which will work with digital I/O . Assume that the input given to the motor through L293D is HIGH("1") and LOW("0"), that will make the motors to rotate in clockwise direction, similarly when the inputs are LOW("0") and HIGH("1") the motor will rotate in anticlockwise direction. But when both the inputs are same (1 & 1 or 0 & 0) the motors won't work.


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