LINE FOLLOWER ROBOT
A Line Follower Robot, as the name suggests, is an automated guided vehicle, which follow a visual line embedded on the floor or ceiling. Usually, the visual line is the path in which the line follower robot goes and it will be a black line on a white surface but the other way (white line on a black surface) is also possible. Certain advanced Line Follower Robots use invisible magnetic field as their paths.
Large line follower robots are usually used in industries for assisting the automated production process. They are also used in military applications, human assistance purpose, delivery services etc.
Line follower Robot is one of the first robots that beginners and students would get their first robotic experience with. In this project, we have designed a simple Line Follower Robot using Arduino and some other components.
COMPONENTS USED :
| SR NO | COMPONENT NAME | QUANTITY |
| 1 | Arduino Board(Uno or Nano) | 1 |
| 2 | Mini BreadBoard | 1 |
| 3 | Motor Driver(L293D)- | 1 |
| 4 | Battery Holder | 1 |
| 5 | BO motor | 2 |
| 6 | IR pair sensor | 2 |
| 7 | Caster wheel | 1 |
| 8 | Wheels | 2 |
| 9 | Jumper cables (M to F and M to M) | 1 set of each |
Schematic Diagram :
Code:
#define lmotorf 2
#define lmotorb 3
#define rmotorf 4
#define rmotorb 5
//HIGH white
//LOW black
void setup() {
pinMode(lmotorf,OUTPUT);
pinMode(rmotorf,OUTPUT);
pinMode(lmotorb,OUTPUT);
pinMode(rmotorb,OUTPUT);
pinMode(6,INPUT);
pinMode(7,INPUT);
}
void loop() {
// dynamic line follower code
// if the sensor is on white it returns LOW value to the Arduino
// if it is on black it returns a HIGH value to the Arduino
int lsensor=digitalRead(6);
int rsensor=digitalRead(7);
if((lsensor==HIGH)&&(rsensor==HIGH))
{
//both sensors on white
// go forward
digitalWrite(lmotorf,HIGH);
digitalWrite(rmotorf,HIGH);
digitalWrite(lmotorb,LOW);
digitalWrite(rmotorb,LOW);
}
else if((lsensor==HIGH)&& (rsensor==LOW))
{
//right sensor on black line
// turn right
digitalWrite(lmotorf,HIGH);
digitalWrite(rmotorf,LOW);
digitalWrite(lmotorb,LOW);
digitalWrite(rmotorb,HIGH);
}
else if((lsensor==LOW)&&(rsensor==HIGH))
{
//left sensor on black line
// turn left
digitalWrite(lmotorf,LOW);
digitalWrite(rmotorf,HIGH);
digitalWrite(lmotorb,HIGH);
digitalWrite(rmotorb,LOW);
}
else
{
digitalWrite(lmotorf,LOW);
digitalWrite(rmotorf,LOW);
digitalWrite(lmotorb,LOW);
digitalWrite(rmotorb,LOW);
}
}
