Published April 8, 2022

Arduino Car

A simple arduino based 2 wheel car with l289n and hc-05

IntermediateFull instructions provided638

Things used in this project

Hardware components

HC-05 Bluetooth Module

hc-06 will do aswell

Arduino UNO

SparkFun Dual H-Bridge motor drivers L298

Software apps and online services

Snappy Ubuntu Core

preferred for more advanced users

Microsoft Windows 10

you can do it with this aswell

Story

This project is based on an arduino uno (any arduino will work with this), controlled with a hc-06 bluetooth module (a hc-05 will work just fine aswell), and ran by a L289N H-Bridge module.

It was built by hand fully with some pieces of scrap aluminum framing, some plastic sheet as the platform and 2 "tank" motor modules I got from an old toy tank and put a better motor in them.

It is powered with a 12v 7.2Ah lead-acid based battery giving it a few hours of runtime.

I made use of the ENA and ENB pins on the arduino to prevent any unwanted movement and just enabled the motors when needed (as seen in the code)

NOTE: if you get a sync error while uploading code to the arduino, unplug the bluetooth modules rxd/txd pins and try again.

I have made a fully custom app for this project soon to be available on google play.

1 / 3 • Some images of the car

Code

Code

/*
Code by NGX aka Clover aka 123lYT
Atom Development @ Google Play

Feel free to add whatever you like to this code and present it to anyone
*/

#include <SoftwareSerial.h>
 
SoftwareSerial blueToothSerial(0, 1);
 
int IN1 = 9;   //IN1 pin
int IN2 = 10;  //IN2 pin
int IN3 = 11;  //IN3 pin
int IN4 = 12;  //IN4 pin
int ENA = 6;   //ENA pin
int ENB = 5;   //ENB pin
char t;
 
/*BT module HC-05 connect by the rule:
   TX --> RX
   RX --> TX
   because T(ransmit)X - sends information
           R(ecieve)X - recieves information
 */
 
void setup() {
  pinMode(IN1, OUTPUT); //IN1 pin
  pinMode(IN2, OUTPUT); //IN2 pin
  pinMode(IN3, OUTPUT); //IN3 pin
  pinMode(IN4, OUTPUT); //IN4 pin  
  pinMode(ENA, OUTPUT); //ENA pin
  pinMode(ENB, OUTPUT); //ENB pin
  Serial.begin (9600);
}
 
void loop() {
 while (Serial.available() > 0) { //writes out the recieved information from the app
    t = Serial.read();
  }
//Serial.print ("C: ");
  Serial.println (t);
   //Serial.print ("D: ");
       switch (t) {   
    case 'F': //command Forward
      digitalWrite(ENA, HIGH);
      digitalWrite(ENB, HIGH);
      digitalWrite(IN4, HIGH);
      digitalWrite(IN3, LOW);
      digitalWrite(IN2, HIGH);
      digitalWrite(IN1, LOW);  
    break;
    case 'B': //command Backward
      digitalWrite(ENA, HIGH);
      digitalWrite(ENB, HIGH);
      digitalWrite(IN4, LOW);
      digitalWrite(IN3, HIGH);
      digitalWrite(IN2, LOW);
      digitalWrite(IN1, HIGH); 
    break;
    case 'L': //command Left
      digitalWrite(ENA, HIGH);
      digitalWrite(ENB, LOW);
      digitalWrite(IN4, LOW);
      digitalWrite(IN3, LOW);
      digitalWrite(IN2, HIGH);
      digitalWrite(IN1, LOW);
    break;
    case 'R': //command Right
      digitalWrite(ENA, LOW);
      digitalWrite(ENB, HIGH);
      digitalWrite(IN4, HIGH);
      digitalWrite(IN3, LOW);
      digitalWrite(IN2, LOW);
      digitalWrite(IN1, LOW); 
    break;
    case 'S': //Stop
      digitalWrite(ENA, LOW);
      digitalWrite(ENB, LOW);
      digitalWrite(IN4, LOW);
      digitalWrite(IN3, LOW);
      digitalWrite(IN2, LOW);
      digitalWrite(IN1, LOW); 
    break;
    }
}