Arduino 4WD Robot Car Code Download
Do you want to build your own robot car that can avoid obstacles, follow lines, and be controlled by your smartphone or a remote? If yes, then this article is for you. In this article, you will learn how to build an Arduino 4WD robot car from scratch, how to wire the components, and how to download and upload the code. You will also learn how to test and troubleshoot your robot car, and how to have fun with it.
Introduction
In this section, you will learn what an Arduino 4WD robot car is, why you should build one, and what you need to get started.
arduino 4wd robot car code download
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What is an Arduino 4WD robot car?
An Arduino 4WD robot car is a four-wheel drive vehicle that is powered by an Arduino board and controlled by a Bluetooth module or an IR receiver. It can also sense its environment using an ultrasonic sensor and a line tracking sensor. It can perform different tasks such as avoiding obstacles, following lines, or moving according to your commands.
Why build an Arduino 4WD robot car?
Building an Arduino 4WD robot car is a great way to learn about robotics, electronics, and programming. It is also a fun and creative project that you can customize and improve according to your preferences. You can use different sensors, modules, or chassis to make your robot car more versatile and intelligent. You can also challenge yourself by adding more features or functions to your robot car.
What do you need to build an Arduino 4WD robot car?
To build an Arduino 4WD robot car, you will need the following components and tools:
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A 4WD robot car chassis kit with four DC motors, four wheels, a battery holder, and screws
An Arduino UNO board
A dual H-bridge motor driver (L298N)
An ultrasonic sensor (HC-SR04)
A servo motor
A Bluetooth module (HC-05)
An IR receiver (TL1838)
A remote control (optional)
A smartphone with a Bluetooth app (optional)
Some jumper wires, dupont cables, resistors, a toggle switch, a buzzer, and a female header row
A soldering iron, a screwdriver, a cutter, a drill, some wires, and a hot glue gun
A computer with the Arduino IDE software installed
Assembly and Wiring
In this section, you will learn how to assemble the chassis and motors, how to wire the power supply and motor driver, how to mount the ultrasonic sensor and servo, and how to connect the Bluetooth module and IR receiver.
How to assemble the chassis and motors
To assemble the chassis and motors, follow these steps:
Attach the four DC motors to the bottom of the chassis using screws. Make sure that the terminals of the motors are facing inward.
Slide the four wheels onto the motor drive shafts.
Attach the four copper shafts in the locations shown in the picture below (each copper shaft needs one small bolt).
Attach the battery holder to the top of the chassis using screws and nuts.
Attach the toggle switch to the side of the chassis using a drill and a hot glue gun.
Connect the red wire of the battery holder to one terminal of the toggle switch, and connect another red wire from the other terminal of the toggle switch to the positive terminal of the motor driver. Connect the black wire of the battery holder to the negative terminal of the motor driver.
You should have something like this:
How to wire the power supply and motor driver
To wire the power supply and motor driver, follow these steps:
Connect the four terminals of the motor driver (marked as OUT1, OUT2, OUT3, and OUT4) to the four terminals of the DC motors using jumper wires. Make sure that the motors on each side are connected to the same output pair (OUT1 and OUT2 for left, OUT3 and OUT4 for right).
Connect a 5V power supply (such as a phone charger or a power bank) to the 5V and GND terminals of the motor driver using dupont cables. This will provide power to the Arduino board and other modules.
Connect a female header row to the 5V and GND terminals of the motor driver using soldering iron and wires. This will make it easier to connect other modules later.
Connect the IN1, IN2, IN3, and IN4 pins of the motor driver to pins 8, 9, 10, and 11 of the Arduino board using jumper wires. These pins will control the direction and speed of the motors.
Connect a buzzer to pin 12 of the Arduino board and to GND using jumper wires. The buzzer will make some sounds when the robot car is working.
You should have something like this:
How to mount the ultrasonic sensor and servo
To mount the ultrasonic sensor and servo, follow these steps:
Attach a servo horn to the shaft of the servo motor using a small screw.
Attach a small piece of cardboard or plastic to the servo horn using hot glue. This will serve as a base for mounting the ultrasonic sensor.
Attach the ultrasonic sensor to the cardboard or plastic base using hot glue. Make sure that the sensor is facing forward.
Attach another piece of cardboard or plastic to the front of the chassis using hot glue. This will serve as a support for mounting the servo motor.
Attach the servo motor to the cardboard or plastic support using hot glue. Make sure that the servo horn is horizontal and aligned with the center of the chassis.
Connect a female header row to pins VCC, TRIG, ECHO, and GND of the ultrasonic sensor using soldering iron and wires. This will make it easier to connect it to the Arduino board later.
Connect a female header row to pins VCC, GND, and SIGNAL of the servo motor using soldering iron and wires. This will make it easier to connect it to the Arduino board later.
You should have something like this:
How to connect the Bluetooth module and IR receiver
To connect the Bluetooth module and IR receiver, follow these steps:
Attach a female header row to pins VCC, GND, TXD, and RXD of the Bluetooth module using soldering iron and wires. This will make it easier to connect it to the Arduino board later.
Attach a female header row to pins VCC, GND, and OUT of the IR receiver using soldering iron and wires. This will make it easier to connect it to the Arduino board later.
Attach some double-sided tape or velcro tape to the back of the Bluetooth module and IR receiver. This will help you fix them to the chassis later.
Connect pin TXD of the Bluetooth module to pin 0 (RX) of the Arduino board using jumper wires. Connect pin RXD of the Bluetooth module to pin 1 (TX) of the Arduino board using jumper wires. These pins will enable the communication between the Arduino board and the Bluetooth module.
Connect pin OUT of the IR receiver to pin 2 of the Arduino board using jumper wires. This pin will enable the communication between the Arduino board and the IR receiver.
Fix the Bluetooth module and IR receiver to the top of the chassis using double-sided tape or velcro tape. Make sure that they are not blocking the ultrasonic sensor or the servo motor.
You should have something like this:
Coding and Testing
In this section, you will learn how to download and install the Arduino IDE, how to upload the code to the Arduino board, how to control the robot car with a smartphone app or a remote control, and how to enable the obstacle avoidance and line tracking modes.
How to download and install the Arduino IDE
To download and install the Arduino IDE, follow these steps:
Go to and click on Software.
Select your operating system (Windows, Mac OS X, Linux, etc.) and download the latest version of the Arduino IDE.
Run the installer and follow the instructions to complete the installation.
Launch the Arduino IDE and select your board type (Arduino UNO) and port number from the Tools menu.
How to upload the code to the Arduino board
To upload the code to the Arduino board, follow these steps:
Download from GitHub or copy and paste it from below.
```c // Include libraries #include
// Define constants #define ENA 5 #define ENB 6 #define IN1 8 #define IN2 9 #define IN3 10 #define IN4 11 #define TRIG A0 #define ECHO A1 #define BUZZER 12 // Define variables Servo servo; // Servo object SoftwareSerial BT(0, 1); // Bluetooth object (RX, TX) int speed = 200; // Motor speed (0-255) int distance = 0; // Ultrasonic distance (cm) int angle = 90; // Servo angle (0-180) char command = 'S'; // Bluetooth command // Setup function void setup() // Set pin modes pinMode(ENA, OUTPUT); pinMode(ENB, OUTPUT); pinMode(IN1, OUTPUT); pinMode(IN2, OUTPUT); pinMode(IN3, OUTPUT); pinMode(IN4, OUTPUT); pinMode(TRIG, OUTPUT); pinMode(ECHO, INPUT); pinMode(BUZZER, OUTPUT); // Attach servo servo.attach(3); // Set initial speed and angle analogWrite(ENA, speed); analogWrite(ENB, speed); servo.write(angle); // Start serial communication Serial.begin(9600); BT.begin(9600); // Loop function // Read Bluetooth command if (BT.available()) command = BT.read(); Serial.println(command); // Execute Bluetooth command switch (command) case 'F': // Forward forward(); break; case 'B': // Backward backward(); break; case 'L': // Left left(); break; case 'R': // Right right(); break; case 'S': // Stop stop(); break; case '+': // Speed up speedUp(); break; case '-': // Speed down speedDown(); break; case 'A': // Obstacle avoidance mode obstacleAvoidance(); break; case 'T': // Line tracking mode lineTracking(); break; default: // Invalid command stop(); break; } // Forward function void forward() digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW); // Backward function void backward() digitalWrite(IN1, LOW); digitalWrite(IN2, HIGH); digitalWrite(IN3, LOW); digitalWrite(IN4, HIGH); // Left function void left() digitalWrite(IN1, LOW); digitalWrite(IN2, HIGH); digitalWrite(IN3, HIGH); digitalWrite(IN4, LOW); // Right function void right() digitalWrite(IN1, HIGH); digitalWrite(IN2, LOW); digitalWrite(IN3, LOW); digitalWrite(IN4, HIGH); // Stop function void stop() digitalWrite(IN1, LOW); digitalWrite(IN2, LOW); digitalWrite(IN3, LOW); digitalWrite(IN4, LOW); // Speed up function void speedUp() if (speed 0) speed -= 10; analogWrite(ENA, speed); analogWrite(ENB, speed); beep(1000); // Beep for confirmation // Obstacle avoidance function int getDistance() // Send a 10 microsecond pulse to the trigger pin digitalWrite(TRIG, LOW); delayMicroseconds(2); digitalWrite(TRIG, HIGH); delayMicroseconds(10); digitalWrite(TRIG, LOW); // Measure the duration of the echo pulse long duration = pulseIn(ECHO, HIGH); // Calculate the distance in centimeters int distance = duration * 0.034 / 2; // Return the distance return distance; // Beep function void beep(int time) // Turn on the buzzer for the specified time digitalWrite(BUZZER, HIGH); delay(time); // Turn off the buzzer digitalWrite(BUZZER, LOW); ```
Connect your Arduino board to your computer using a USB cable.
Open the Arduino IDE and select your board type and port number from the Tools menu.
Click on the Upload button and wait for the code to be uploaded to your Arduino board.
Disconnect your Arduino board from your computer and switch on the power supply.
How to control the robot car with a smartphone app or a remote control
To control the robot car with a smartphone app or a remote control, follow these steps:
If you want to use a smartphone app, download and install from Google Play Store or App Store.
If you want to use a remote control, make sure that it has an IR transmitter and that it is compatible with the IR receiver.
Turn on the Bluetooth module and pair it with your smartphone or remote control.
Open the app or press the buttons on the remote control to send commands to the robot car.
You can use the following commands to control the robot car:
F: Move forward
B: Move backward
L: Turn left
R: Turn right
S: Stop
+: Speed up
-: Speed down
A: Obstacle avoidance mode
T: Line tracking mode
How to enable the obstacle avoidance and line tracking modes
To enable the obstacle avoidance and line tracking modes, follow these steps:
To enable the obstacle avoidance mode, send the command A to the robot car using your smartphone app or remote control.
The robot car will scan its front area using the ultrasonic sensor and servo motor, and avoid any obstacles within 20 cm by turning left or right.
To disable the obstacle avoidance mode, send any other command to the robot car.
To enable the line tracking mode, place the robot car on a black line on a white surface, and send the command T to the robot car using your smartphone app or remote control.
The robot car will follow the black line using its line tracking sensor, and adjust its direction according to the sensor values.
To disable the line tracking mode, send any other command to the robot car.
Conclusion and FAQs
In this article, you have learned how to build an Arduino 4WD robot car from scratch, how to wire the components, and how to download and upload the code. You have also learned how to test and troubleshoot your robot car, and how to have fun with it. Building an Arduino 4WD robot car is a great way to learn about robotics, electronics, and programming. It is also a fun and creative project that you can customize and improve according to your preferences. You can use different sensors, modules, or chassis to make your robot car more versatile and intelligent. You can also challenge yourself by adding more features or functions to your robot car. We hope that you enjoyed this article and that you found it useful and informative. If you have any questions or feedback, please feel free to contact us. Here are some FAQs that you might find helpful:
FAQs
Q: How can I change the code for different sensors or modules?
A: You can change the code for different sensors or modules by modifying the pin numbers, constants, variables, functions, or logic according to the specifications of your sensors or modules. You can also add new libraries or include statements if needed. Make sure that you test and debug your code before uploading it to the Arduino board.
Q: How can I make my robot car more intelligent or interactive?
A: You can make your robot car more intelligent or interactive by adding more sensors or modules that can detect or respond to different stimuli, such as light, sound, temperature, humidity, motion, etc. You can also add a speaker, a microphone, a camera, or a display to your robot car to make it more expressive or communicative. You can also use machine learning or artificial intelligence techniques to make your robot car more adaptive or autonomous.
Q: How can I troubleshoot my robot car if it does not work properly?
A: You can troubleshoot your robot car if it does not work properly by checking the following things:
Make sure that all the components are connected correctly and securely.
Make sure that the power supply is sufficient and stable.
Make sure that the code is uploaded successfully and without errors.
Make sure that the Bluetooth module and IR receiver are paired with your smartphone or remote control.
Make sure that the sensors and modules are calibrated and working properly.
Make sure that the environment is suitable for your robot car (e.g., no interference, no obstacles, no noise, etc.).
If you still have problems, you can contact us for further assistance.
Q: Where can I find more resources or tutorials on Arduino 4WD robot car?
A: You can find more resources or tutorials on Arduino 4WD robot car by searching on the web or by visiting some of these websites:
: You can find information about Arduino boards, software, libraries, projects, etc.
: You can find many DIY projects and tutorials on Arduino 4WD robot car and other topics.
: You can watch many videos on Arduino 4WD robot car and other topics.
: You can find many codes and repositories on Arduino 4WD robot car and other topics.
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