Automotic Wall Follower Robot

Background:

Today the autonomous robots by tracking some sort of guidance are very famous. One on this type is the line following robot, a similar is wall following robot where the robot follow some wall and move around the wall. Here in this section we will discuss all about the wall following robot and their simplest circuit.

Components required.

  • DC geared motor (2 sets)
  • wheels (2 sets)
  • caster wheel
  • IR LED (2 sets)
  • Phototransistor (2 sets)
  • Variable resistance, 100K-Ohm (2sets)
  • resistance, 330 Ohm (4 sets)
  • Power Transistor (4 sets)
  • PCB
  • Ribbon Wire
  • Robotic Base
  • Power source, 9V DC
  • Battery connector

Design and working:

As we have seen already in autonomous line follower robot that the transistor-transistor motor derive circuit have a central point across which the motor gets OFF and ON as per the logic we have incorporated therein. Here we will use the same circuit but the configuration is different from autonomous line follower. Here we use one circuit and tune up the variable resistance so that the motor turns ON when the light(IR) intensity increases on the face of Phototransistor. In other circuit we swap the configuration and alter the position of the phototransistor and the variable resistance in the voltage divider section so that the motor connected to this circuit tunes on when the light (IR) intensity increases above the certain level on the face of the phototransistor. As in shown in figure-1 the Motor-1 is turns ON when the IR light intensity increases on the phototransistor face and motor-2 turn ON when the IR light intensity decreased on the phototransistor face.

figure-1

figure-1

We use these two phenomenons to control our robot. But before this we have to transport the circuit parts as leveled in the figure-2 to form the wall sensing module.

figure-2

figure-2

Here the Sensor-Module (SM)-1 and SM2 are representing the sensor modules that will fixed up in the robot body parts as shown into the figure-3. When robot come closure to the wall the SM-2 senses the event and turns the motor-2 (which is away from the wall) OFF so that the robot goes away from the wall. when the robot goes far away from the wall then SM-1 comes into the picture and it senses the low IR light on the SM-1 which signifies the event of robot moves far away from the wall and in that condition the Moto-1 turned OFF by the intelligent circuit associated with this and then the Robot comes closure to the wall so by the both action the robot maintains a certain distance from the wall and these distance can be controlled by changing the variable resistance values. So that’s all about the wall follower, now it’s time to get up and build one for yourself :)

figure-3

figure-3

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