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3-IN-1 Robotic Car with Arduino Nano

Introduction

About this project

My first Arduino project. This is a four-wheel car with 3 modes:

  • Auto: Obstacle avoiding
  • Manual: Bluetooth controlling
  • Manual: Infrared controlling

Unlike many tutorials on the internet, I build my robot to stop automatically without having to press any stop button. If I want the robot to run, I'll just hold the button on the controller and release it when i don't want to. Therefore, the robot become easier to control o.<

DEMO

Obstacle Avoiding

Bluetooth Controlling

IR Controlling

Components and Supplies

Image Name QTY
Arduino Nano 1
L298N - Motor Driver 1
3-6V DC motor and wheel 4
SG90 - Micro Servo Motor 1
HC-SR04 - Ultrasonic Sensor 1
HC-06 - Bluetooth module 1
KY-022 - IR Receiver Sensor 1
Mini breadboard 1
Plastic box 1

Necessary tools

Image Name
Kid's engineering kit
Soldering iron
Hot glue gun
Jumper wires
Infrared remote control

Notes:

  • I only use the short L-shape bracket in the engineering kit. You can buy a mounting bracket for ultrasonic sensor, which is way better :3
  • You can use any IR remote, just make sure to edit the buttons' hex value in the code before uploading it to Arduino. I use the remote shown above and its hex codes are:
#define ON    0xFFA25D
#define OFF   0xFFE21D
#define MODE1 0xFFE01F
#define MODE2 0xFFA857
#define MODE3 0xFF906F
#define SOS   0xFF18E7
#define HOLD  0xFFFFFFFF // Generally, remote will send this value when you're holding a button

How to exactly know the hex codes?

Connect IR receiver module with Arduino like this

Then plug in the USB cable to upload the code.

#include <IRremote.h>

#define RECV_PIN 2 // Specifying the pin connected to receiver module
IRrecv irrecv(RECV_PIN);
decode_results button;

void setup(){
  Serial.begin(9600);
  irrecv.enableIRIn(); // Initialization to receive IR signals 
}

void loop(){
  if(irrecv.decode(&button)){ // Store decoded signal in `button`, return 0 if nothing is received        
    Serial.println(button.value); // Print the value to the serial monitor
    irrecv.resume();
  }
}

On Arduino IDE, go to Tools -> Serial Monitor (or press Ctrl+Shift+M) then press the buttons on the remote respectively to get their Hex values on the monitor.

App

  • Arduino IDE

  • Any Arduino bluetooth controller app.

    I chose Arduino Bluetooth Controlled Joystick. Besides two joystick modes and one accelerometer mode, this app provides Button Mode - the mode i'm using in this project. I use the default setting in the app:

    Button Symbol Character send
    Up arrow ˄ N
    Down arrow ˅ S
    Left arrow ˂ W
    Right arrow ˃ E
    Cross X 1
    Circle O 2
    Triangle Δ 3
    Square □ 4

Schematic