how to MAKE Your Own LEGO & Micro:bit RC Tank

Introduction

If you’re passionate about LEGO and technology, creating a remote-controlled tank using LEGO bricks and a Micro:bit controller is the perfect DIY project for you. Combining creativity with STEM skills, this project offers a hands-on experience in engineering, coding, and design. Whether you’re a hobbyist or looking to introduce kids to programming and robotics, this tutorial is for you.

Let’s dive into building your LEGO & Micro:bit RC Tank and learn how to control it wirelessly!

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Table of Contents

1. What You Need to Get Started
2. Step 1: Building the LEGO Tank Body
3. Step 2: Setting Up the Micro:bit Controller
4. Step 3: Programming the Micro:bit
5. Step 4: Integrating the Electronics
6. Step 5: Testing & Troubleshooting
7. FAQs About LEGO & Micro:bit RC Tanks
8. Conclusion

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1- What You Need to Get Started

Before you begin, gather the following materials:

• LEGO Technic parts (for tank body, tracks, gears, etc.)
• 2 Micro:bit boards (one for the tank, one for the controller)
• Micro:bit motor driver board
• DC motors compatible with LEGO
• Rechargeable battery pack
• Jumper wires
• Bluetooth-enabled smartphone or tablet
• Micro-USB cables
• A computer with access to the Micro:bit MakeCode editor

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2- Step 1: Building the LEGO Tank Body

Instructions:

1. Design the Frame: Use LEGO Technic beams to create a sturdy rectangular base for your tank.
2. Add Tracks: Attach LEGO tracks to both sides of the frame. Ensure the tracks rotate smoothly when connected to motors.
3. Incorporate Motor Mounts: Secure the DC motors within the LEGO structure so they can drive the tracks efficiently.
4. Build the Top Section: Add decorative elements or functional compartments, like a rotating turret, using extra LEGO bricks.

Pro Tip: Balance the weight distribution to avoid tipping when the tank moves.

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3- Step 2: Setting Up the Micro:bit Controller

Instructions:

1. Insert one Micro:bit into the motor driver board.
2. Connect the DC motors to the motor driver’s output ports using jumper wires.
3. Connect the battery pack to the motor driver board.
4. Turn on the power and ensure the connections are stable.

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4- Step 3: Programming the Micro:bit

Instructions:

1. Go to Micro:bit MakeCode.
2. Create a new project.
3. Write a program for:
   • Receiving commands from the remote Micro:bit.
   • Controlling the motors for forward, backward, left, and right movements.
4. Flash the program onto the Micro:bit controlling the tank.
5. On the remote Micro:bit, program the buttons to send directional commands using Bluetooth.

Example Code Snippet:

input.onButtonPressed(Button.A, function () {
    radio.sendString("forward")
})
input.onButtonPressed(Button.B, function () {
    radio.sendString("backward")
})
radio.onReceivedString(function (receivedString) {
    if (receivedString == "forward") {
        motors.forward()
    } else if (receivedString == "backward") {
        motors.backward()
    }
})

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5- Step 4: Integrating the Electronics

Instructions:

1. Secure the Micro:bit and motor driver board to the LEGO tank using LEGO parts or adhesive.
2. Route the wires neatly to avoid interference with the moving parts.
3. Test the Bluetooth connection between the remote and the tank Micro:bits.

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6- Step 5: Testing & Troubleshooting

Checklist:

• Test each direction command to ensure the motors respond correctly.
• Check for loose connections if the tank doesn’t move.
• Calibrate the tank’s speed and steering to improve control.

Pro Tip: Use a flat, open surface for initial testing to avoid obstacles.

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7- FAQs About LEGO & Micro:bit RC Tanks

1. How do I improve the tank’s speed?

Use motors with higher torque and ensure the tracks aren’t too tight.

2. Can I add sensors?

Yes, Micro:bit supports various sensors like ultrasonic modules for obstacle detection.

3. What if the Bluetooth connection fails?

Re-pair the devices and ensure both Micro:bits are set to the same radio group.

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8- Conclusion

Congratulations on building your LEGO & Micro:bit RC Tank! This project combines creativity and technical skills, making it a great introduction to robotics and coding. To enhance your tank, consider adding advanced features like obstacle detection, camera integration, or even autonomous navigation.