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Arduino - Car

One of the most exciting projects for Arduino beginners is creating an Arduino robot car. In this tutorial, we will discover how to use Arduino to build a robot car and control it using an IR remote controller. We will also explore another tutorial where we will learn to transform it into a Bluetooth-controlled car.

Hardware Required

1	×	Official Arduino Uno
1	×	Alternatively, DIYables STEM V3, Fully Compatible with Arduino Uno R3
1	×	USB 2.0 cable type A/B (for USB-A PC)
1	×	USB 2.0 cable type C/B (for USB-C PC)
1	×	RC Car
1	×	L9110S Motor Driver Module
1	×	IR Remote Controller Kit
1	×	CR2025 Battery (for IR Remote controller)
1	×	1.5V AA Battery (for Arduino and Car)
1	×	Jumper Wires
1	×	Recommended: Screw Terminal Block Shield for Arduino Uno
1	×	Recommended: Sensors/Servo Expansion Shield for Arduino Uno
1	×	Recommended: Breadboard Shield for Arduino Uno
1	×	Recommended: Enclosure for Arduino Uno
1	×	Recommended: Prototyping Base Plate & Breadboard Kit for Arduino UNO

Or you can buy the following kits:

1	×	DIYables STEM V3 Starter Kit (Arduino included)
1	×	DIYables Sensor Kit (18 sensors/displays)

Disclosure: Some links in this section are Amazon affiliate links. If you make a purchase through these links, we may earn a commission at no extra cost to you.
Additionally, some links direct to products from our own brand, DIYables .

About Robot Car

In the Arduino context, the robot car is commonly referred to as the robot car, RC car, remote control car, smart car, or DIY car. It can be controlled remotely and wirelessly using either an IR remote controller or a smartphone app via Bluetooth/WiFi... The robot car can turn left or right and move forward or backward.

A 2WD (Two-Wheel Drive) car for Arduino is a small robotic vehicle that you can build and control using an Arduino board. It typically consists of the following components:

Chassis: The base or frame of the car,where all other components are mounted.
Wheels: The two wheels that provide locomotion to the car. They are attached to two DC motor.
Motors: Two DC motors are used to drive the two wheels.
Motor Driver: The motor driver board is an essential component that interfaces between the Arduino and the motors. It takes signals from the Arduino and provides the necessary power and control to the motors.
Arduino Board: The brain of the car. It reads inputs from sensors and user commands and controls the motors accordingly.
Power Source: The 2WD car requires a power source, usually batteries and a battery holder, to power the motors and the Arduino board.
Wireless receiver: an infrared, Bluetooth or WiFi module for wireless communication with a remote control or smartphone.
Optional Components: Depending on your project's complexity, you may add various optional components like sensors (e.g., ultrasonic sensors for obstacle avoidance, line-following sensors), and more.

In this tutorial, to make it simple, we will use:

2WD Car kit (including Chassis, wheels, motors, battery holder)
L9110S Motor Driver
IR infrared kit (including IR controller and IR receiver)

Check the hardware list at the top of this page.

How It Works

Arduino connects to the DC motors of the robot car through L9110S motor driver module.
Arduino connects to an IR receiver.
The battery powers Arduino, DC motors, motor driver, and IR receiver.
Users press the UP/DOWN/LEFT/RIGHT/OK keys on the IR remote controller.
Arduino receives the UP/DOWN/LEFT/RIGHT/OK commands through the IR receiver.
Arduino controls the car to move FORWARD/BACKWARD/LEFT/RIGHT/STOP by controlling the DC motor via the motor driver.

Wiring Diagram

This image is created using Fritzing. Click to enlarge image

The L9110S module powers the motors directly from its VCC and GND pins and does not have an onboard 5V regulator. This means you can power everything from a single power source — four 1.5V AA batteries (totaling 6V). Here's how we can do it:

Connect the 6V battery to the VCC and GND pins of the L9110S module to power the motors.
Connect the same 6V battery to the Vin and GND pins of the Arduino board to power the Arduino (the IR receiver is powered from the Arduino's 5V pin).
Make sure the L9110S module, the Arduino board, and the IR receiver share a common GND.

Unlike the L298N, the L9110S has no ENA/ENB enable jumpers and no 12V screw terminal, so the wiring is simpler.

Please note that during the development period, when you need to connect the USB cable to the Arduino for programming, you MUST disconnect the power between the battery and the Arduino board by remove a wiring from Vin pin. The Arduino board should not be powered by two power sources simultaneously.

Arduino Code

/* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-car */ #include <DIYables_IRcontroller.h> // DIYables_IRcontroller library #define IR_RECEIVER_PIN 3 // The Arduino pin connected to IR receiver #define MOTOR_A_IA_PIN 5 // The Arduino pin connected to the A-IA pin of the L9110S (Motor A) #define MOTOR_A_IB_PIN 6 // The Arduino pin connected to the A-IB pin of the L9110S (Motor A) #define MOTOR_B_IA_PIN 9 // The Arduino pin connected to the B-IA pin of the L9110S (Motor B) #define MOTOR_B_IB_PIN 10 // The Arduino pin connected to the B-IB pin of the L9110S (Motor B) DIYables_IRcontroller_17 irController(IR_RECEIVER_PIN, 200); // debounce time is 200ms void setup() { Serial.begin(9600); irController.begin(); pinMode(MOTOR_A_IA_PIN, OUTPUT); pinMode(MOTOR_A_IB_PIN, OUTPUT); pinMode(MOTOR_B_IA_PIN, OUTPUT); pinMode(MOTOR_B_IB_PIN, OUTPUT); } void loop() { Key17 key = irController.getKey(); if (key != Key17::NONE) { switch (key) { case Key17::KEY_UP: Serial.println("MOVING FORWARD"); CAR_moveForward(); break; case Key17::KEY_DOWN: Serial.println("MOVING BACKWARD"); CAR_moveBackward(); break; case Key17::KEY_LEFT: Serial.println("TURNING LEFT"); CAR_turnLeft(); break; case Key17::KEY_RIGHT: Serial.println("TURNING RIGHT"); CAR_turnRight(); break; case Key17::KEY_OK: Serial.println("STOP"); CAR_stop(); break; default: Serial.println("WARNING: unused key:"); break; } } } void CAR_moveForward() { digitalWrite(MOTOR_A_IA_PIN, HIGH); digitalWrite(MOTOR_A_IB_PIN, LOW); digitalWrite(MOTOR_B_IA_PIN, HIGH); digitalWrite(MOTOR_B_IB_PIN, LOW); } void CAR_moveBackward() { digitalWrite(MOTOR_A_IA_PIN, LOW); digitalWrite(MOTOR_A_IB_PIN, HIGH); digitalWrite(MOTOR_B_IA_PIN, LOW); digitalWrite(MOTOR_B_IB_PIN, HIGH); } void CAR_turnLeft() { digitalWrite(MOTOR_A_IA_PIN, HIGH); digitalWrite(MOTOR_A_IB_PIN, LOW); digitalWrite(MOTOR_B_IA_PIN, LOW); digitalWrite(MOTOR_B_IB_PIN, LOW); } void CAR_turnRight() { digitalWrite(MOTOR_A_IA_PIN, LOW); digitalWrite(MOTOR_A_IB_PIN, LOW); digitalWrite(MOTOR_B_IA_PIN, HIGH); digitalWrite(MOTOR_B_IB_PIN, LOW); } void CAR_stop() { digitalWrite(MOTOR_A_IA_PIN, LOW); digitalWrite(MOTOR_A_IB_PIN, LOW); digitalWrite(MOTOR_B_IA_PIN, LOW); digitalWrite(MOTOR_B_IB_PIN, LOW); }

Quick Steps

Install DIYables_IRcontroller library on Arduino IDE by following this instruction
Do the wiring as the diagram shown above.
Disconnect the wire from the Vin pin on the Arduino because we will power Arduino via USB cable when uploading code.
Flip the car upside down so that the wheels are on top.
Connect the Arduino to your computer using the USB cable.
Copy the provided code and open it in the Arduino IDE.
Click the Upload button in the Arduino IDE to transfer the code to the Arduino.
Use the IR remote controller to make the car go forward, backward, left, right, or stop.
Check if the wheels move correctly according to your commands.
If the wheels move the wrong way, swap the wires of the DC motor on the L9110S module.
You can also see the results on the Serial Monitor in the Arduino IDE.

Newbiely | Arduino IDE 2.3.8

──

☐

Newbiely.ino

···

8 Serial.println("Hello World!");

Output

Serial Monitor

Message (Enter to send message to 'Arduino Uno' on 'COM15')

New Line

9600 baud

MOVING FORWARD MOVING BACKWARD TURNING LEFT TURNING RIGHT STOP

Ln 11, Col 1

Arduino Uno on COM15

If everything is working fine, disconnect the USB cable from the Arduino, and connect back the wire to Vin pin to power the Arduino from the battery.
Flip the car back to its normal position with the wheels on the ground.
Have fun controlling the car!

Code Explanation

Read the line-by-line explanation in comment lines of code!

You can learn more about the code by checking the following tutorials:

Arduino - Infrared Remote Control tutorial
Arduino - DC motor tutorial

You can extend this project by:

Adding obstacle avoidance sensors to immidilately stop the car if an obstacle is detected.
Adding function to control the speed of car (see Arduino - DC motor tutorial). The provided code controls car with full speed.

Video Tutorial

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