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builder-dave
Published © GPL3+

Simple Bluetooth Car with Android App

Build a simple l298n enabled car with an Arduino uno and 4 DC motors and code the android app!

BeginnerFull instructions provided1,300
Simple Bluetooth Car with Android App

Things used in this project

Hardware components

HC-05 Bluetooth Module
HC-05 Bluetooth Module
×1
Arduino UNO
Arduino UNO
×1
7.4v Lipo Battery
×1
DC motor (generic)
×4
L298N Motor / Stepper Driver
×1
Jumper wires (generic)
Jumper wires (generic)
×1

Software apps and online services

MIT App Inventor 2
MIT App Inventor 2

Story

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Schematics

Arduino HC05 Fritzing Diagram

Arduino HC05 Fritzing Diagram

Code

Arduino UNO code to control 4 dc motors

Arduino
You will need to upload this code to your Arduino.
/*
 * Control 4 DC motors with Smartphone via bluetooth
 */
 
int motor1Pin1 = 4;
int motor1Pin2 = 5; 
int enable1Pin = 3; 
int motor2Pin1 = 12; 
int motor2Pin2 = 13;
int enable2Pin = 11; 
int state;
int flag=0;        
int stateStop=0;
void setup() {
    // sets the pins as outputs:
    pinMode(motor1Pin1, OUTPUT);
    pinMode(motor1Pin2, OUTPUT);
    pinMode(enable1Pin, OUTPUT);
    pinMode(motor2Pin1, OUTPUT);
    pinMode(motor2Pin2, OUTPUT);
    pinMode(enable2Pin, OUTPUT);
    // sets enable1Pin and enable2Pin high so that motor can turn on:
    digitalWrite(enable1Pin, HIGH);
    digitalWrite(enable2Pin, HIGH);
    // initialize serial communication at 9600 bits per second:
    Serial.begin(9600);
}

void loop() {
    if(Serial.available() > 0){     
      state = Serial.read();   
      flag=0;
    }   
    // if the state is 'F' the DC motor will go forward
    if (state == 'F') {
        digitalWrite(motor1Pin1, HIGH);
        digitalWrite(motor1Pin2, LOW); 
        digitalWrite(motor2Pin1, LOW);
        digitalWrite(motor2Pin2, HIGH);
        if(flag == 0){
          Serial.println("Go Forward!");
          flag=1;
        }
    }
    
    // if the state is 'R' the motor will turn left
    else if (state == 'R') {
        digitalWrite(motor1Pin1, HIGH); 
        digitalWrite(motor1Pin2, LOW); 
        digitalWrite(motor2Pin1, LOW);
        digitalWrite(motor2Pin2, LOW);
        if(flag == 0){
          Serial.println("Turn LEFT");
          flag=1;
        }
        delay(1000);
        state=3;
        stateStop=1;
    }
    // if the state is 'S' the motor will Stop
    else if (state == 'S' || stateStop == 1) {
        digitalWrite(motor1Pin1, LOW); 
        digitalWrite(motor1Pin2, LOW); 
        digitalWrite(motor2Pin1, LOW);
        digitalWrite(motor2Pin2, LOW);
        if(flag == 0){
          Serial.println("STOP!");
          flag=1;
        }
        stateStop=0;
    }
    // if the state is 'L' the motor will turn right
    else if (state == 'L') {
        digitalWrite(motor1Pin1, LOW); 
        digitalWrite(motor1Pin2, LOW); 
        digitalWrite(motor2Pin1, LOW);
        digitalWrite(motor2Pin2, HIGH);
        if(flag == 0){
          Serial.println("Turn RIGHT");
          flag=1;
        }
        delay(1000);
        state=3;
        stateStop=1;
    }
    // if the state is 'B' the motor will Reverse
    else if (state == 'B') {
        digitalWrite(motor1Pin1, LOW); 
        digitalWrite(motor1Pin2, HIGH);
        digitalWrite(motor2Pin1, HIGH);
        digitalWrite(motor2Pin2, LOW);
        if(flag == 0){
          Serial.println("Reverse!");
          flag=1;
        }
    }
    //For debugging purpose
    Serial.println(state);
}

Credits

builder-dave
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