Software Serial Bluetooth RC Car

Bongilcheon high school created this RC car.

AdvancedShowcase (no instructions)30 minutes3,487

Things used in this project

Hardware components

9V battery (generic)

Tessel Bluetooth Low Energy Module

Arduino Nano R3

Jumper wires (generic)

Texas Instruments Motor Drivers

Story

The Project

I made the RC car this time. I used a bluetooth module that I learned how to use last time. I used Arduino Nano, unlike now.

Though Arduino Nano is smaller than Arduino UNO, it almost has all functions that Arduino UNO has.

Connections

You can connect them by reference following pictures

Finishing Up

Finished prior step, then you should connect your RC car with Bluetooth spp pro that is an app on your phone.

If you connected perfectly, the RC car will move by your command.

If you do not succeed, never give up and keep trying until you succeed.

Then you will feel great pride in accomplishment.

Untitled file

#include <SoftwareSerial.h>
SoftwareSerial BTSerial (11, 12);
// BTSerial (Rx, Tx); Based on the Aduno board
// Connect the pin of 11 pin of Arduino board to TX pin of Bluetooth module, connect Pin 12 and RX
#define EN1 3 // Motor A to motor driver A-1A pin connection
#define EN2 4 // Motor A to Motor Driver A-1B Pin Connection
#define EN3 6 // motor B and motor driver B-1A pin connection
#define EN4 7 // motor B and motor driver b-1B pin connection
int carSpeed = 200; // Speed of RC car
void setup () {
BTSerial.begin (9600); // Communication with Bluetooth module via software serial communication
// Initialize both pins of motor A to output mode
pinMode (EN1, OUTPUT);
pinMode (EN2, OUTPUT);
// Initialize both pins of motor B to output mode
pinMode (EN3, OUTPUT);
pinMode (EN4, OUTPUT);
}
void loop () {
if (BTSerial.available ()) {
  char command = BTSerial.read (); // Save command received in Bluetooth to command
  if (command == 'F' || command == 'f') {
    // function call to advance RC car when receiving F or f as input
    moving_forward ();
  }
  else if (command == 'B' || command == 'b') {
    // function call to reverse RC car when receiving B or b as input
    moving_backward ();
  }
  else if (command == 'L' || command == 'l') {
    // function call that rotates RC car left when receiving L or l as input
    moving_left ();
  }
  else if (command == 'R' || command == 'r') {
    // function call that rotates RC car right when receiving R or r as input
    moving_right ();
  }
  else if (command == 'S' || command == 's') {
    // Function call to stop RC car when receiving S or s as input
    stop_moving ();
  }
  else {
    // Function call to stop RC car when not recognizing command
    stop_moving ();
  }
}
// Time delay
delay (100);
}
void moving_forward () {
// Rotate motor A forward
digitalWrite (EN1, HIGH);
digitalWrite (EN2, LOW);
// Rotate motor B forward
digitalWrite (EN3, HIGH);
digitalWrite (EN4, LOW);
}
void moving_backward () {
// Rotate motor A in the reverse direction
digitalWrite (EN1, LOW);
digitalWrite (EN2, HIGH);
// Rotate motor B in the reverse direction
digitalWrite (EN3, LOW);
digitalWrite (EN4, HIGH);
}
void moving_left () {
// Rotate motor A forward
digitalWrite (EN1, HIGH);
digitalWrite (EN2, LOW);
// Rotate motor B in the reverse direction
digitalWrite (EN3, LOW);
digitalWrite (EN4, HIGH);
}
void moving_right () {
// Rotate motor A in the reverse direction
digitalWrite (EN1, LOW);
digitalWrite (EN2, HIGH);
// Rotate motor B forward
digitalWrite (EN3, HIGH);
digitalWrite (EN4, LOW);
}
void stop_moving () {
digitalWrite (EN1, LOW);
digitalWrite (EN2, LOW);
digitalWrite (EN3, LOW);
digitalWrite (EN4, LOW);
}