As all know, we can make different projects using Arduino Uno. In this article, I'll show you how to make a line following Bluetooth car using Arduino Uno board. Before start, I like to remind you about our last article about Arduino. It also the same concept. Refer to our previous article. Let's go to the article.
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| Arduino Uno Line Following Car |
- This Bluetooth-controlled car follows a line using 3 IR sensors. Maybe you have a question about why we use 3 IRs. Actually, the middle IR sensor detects the line and the other two keep the car steady on the track
- We can do the make this using 2 IRs but for better performance and to get the smooth condition, we use 3 IR sensors.
- First, we consider the types of equipment that we need
Apparatus
1.Arduino Uno board
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| Arduino Uno board |
2. 3 IR sensor
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| IR sensor |
3.DC motor drive(L298N)
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| DC motor drive |
4.Jumper wires
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Jumper wires |
5.Four phone battery
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| phone battery |
6.Dc motor with gear
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| Dc motor |
7.Bluetooth module(HC 6)
CONNECTION DIAGRAM
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CONNECTION DIAGRAM |
Arduino code
*/
//m1
int enA = 10;
int in1 = 12;
int in2 = 8;
//m2
int enB = 5;
int in3 = 7;
int in4 = 6;
char val;
void setup() {
Serial.begin(9600);
pinMode(enA, OUTPUT);
pinMode(enB, OUTPUT);
pinMode(in1, OUTPUT);
pinMode(in2, OUTPUT);
pinMode(in3, OUTPUT);
pinMode(in4, OUTPUT);
pinMode(2, INPUT);
pinMode(3, INPUT);
pinMode(4, INPUT);
}
void mpower(int motor, int rotation, int spd) {
int pwm;
int pA;
int pB;
if (motor == 1) {
pwm = enA;
pA = in1;
pB = in2;
}
else if (motor == 2) {
pwm = enB;
pA = in3;
pB = in4;
}
else {
return;
}
if (rotation == 0) {
digitalWrite(pA, LOW);
digitalWrite(pB, LOW);
}
else if (rotation == 1) {
digitalWrite(pA, HIGH);
digitalWrite(pB, LOW);
}
else if (rotation == -1) {
digitalWrite(pA, LOW);
digitalWrite(pB, HIGH);
}
analogWrite(pwm, spd);
}
void loop() {
int lol;
if (digitalRead(3) == HIGH) {
if (digitalRead(2) == LOW) {
if (digitalRead(4) == LOW) {
//go straight
mpower(1, -1, 255);
mpower(2, 1, 255);
lol == '1';
}
else {
//turn right
mpower(1, 1, 255);
mpower(2, 1, 255);
lol == '2';
}
}
else {
if (digitalRead(4) == LOW) {
//turn left
mpower(1, -1, 255);
mpower(2, -1, 255);
lol == '3';
}
else {
//stop
mpower(1, 1, 0);
mpower(2, -1, 0);
lol == '4';
}
}
}
else {
if (digitalRead(2) == LOW) {
if (digitalRead(4) == LOW) {
//stop
if (lol == '1') {
mpower(1, -1, 255);
mpower(2, 1, 255);
}
else if (lol == '2') {
mpower(1, -1, 255);
mpower(2, -1, 255);
}
else if (lol == '3') {
mpower(1, 1, 255);
mpower(2, 1, 255);
}
else if (lol == '4') {
mpower(1, -1, 0);
mpower(2, 1, 0);
}
else if (lol == '6') {
mpower(1, -1, 255);
mpower(2, -1, 255);
}
else if (lol == '7') {
mpower(1, 1, 255);
mpower(2, 1, 255);
}
else if (lol == '8') {
mpower(1, -1, 0);
mpower(2, -1, 0);
}
//lol=='5';
}
else {
//turn right
mpower(1, 1, 255);
mpower(2, 1, 255);
lol == '6';
}
}
else {
if (digitalRead(4) == LOW) {
//turn left
mpower(1, -1, 255);
mpower(2, - 1, 255);
lol == '7';
}
else {
//stop
mpower(1, -1, 0);
mpower(2, -1, 0);
lol == '8';
}
}
}
}
You can watch the completed project by clicking here
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If you have any issue regarding this project, you can directly contact us or you can comment on our youtube channel.
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