Smart 4WD Robot Car Kit for UNO R3, Bluetooth, Line Follower- DIY Educational Robotics

Specifications

• Controller: Arduino UNO R3 Compatible (ATmega328P).

• Chassis: 4-Wheel Drive (4WD) Acrylic Double-Layer Platform.

• Motors: 4x High-Torque DC Gear Motors (BO Motors).

• Driver: L298N Dual H-Bridge Motor Driver Module.

• Sensors included:

  • Ultrasonic Module (HC-SR04) + Mounting Bracket.

  • IR Line Tracking Module.

  • Bluetooth Module (HC-05 or HC-06).

• Power: Battery Holder (Generic) with Switch.

• Wheels: High-grip rubber tires for various surfaces (tiles, carpet).

Project Evolution

• Prerequisite: No prior experience needed. This is the entry point.

• The Upgrade: Once you master the basics, this chassis is a modular platform. You can mount a Servo Motor to scan the ultrasonic sensor 180 degrees, or add a Pixy Camera to make it chase colored balls.

• Effort Level: Beginner to Intermediate. Wiring requires patience (approx 1-2 hours assembly).

Virtual Technician & Wiring Guide

• ⚠️ Voltage Warning: The motor driver reduces voltage. We recommend using high-quality Li-ion batteries (18650) instead of standard AA alkaline batteries, which drain too quickly.

• Probots™ Logic-Safe: When connecting the Bluetooth module, remember to disconnect the RX/TX pins while uploading code to the Arduino. Failing to do so will cause an "Upload Error."

• Wiring Tip: The L298N driver has a 5V output that can power your Arduino. Do not plug the Arduino USB into a computer while the external battery pack is ON and powering the VIN pin simultaneously.

Helpful Tutorials & Resources

• Code & Tutorials

Frequently Asked Questions (FAQ)

• Is this kit pre-assembled? No, it is a DIY kit. You need to assemble the chassis and wire the electronics.
• Does it require soldering? Generally no. The motors usually come with wires attached, or you can twist-and-tape, but soldering is recommended for a permanent bond.
• Are batteries included? No, batteries are sold separately. We recommend 2x 18650 Li-ion batteries.
• Can I program it with a phone? You can control it with a phone, but you need a PC/Laptop to upload the code first.
• Is the code provided? Yes, we provide standard sample code for Bluetooth control and Obstacle avoidance.
• What is the maximum speed? It moves at a brisk walking pace (approx 0.5 m/s), safe for indoor use.
• Can I add a camera? Yes, the chassis has plenty of holes to mount a Raspberry Pi Camera or FPV cam.
• Does it work with Scratch/Block coding? Yes, using mBlock or similar Arduino block-coding software.
• Why do the motors spin in opposite directions? DC motors have polarity. Simply swap the red and black wires on the motor driver to reverse the direction.
• How long does the battery last? With good 18650 batteries, you can get 45-60 minutes of continuous runtime.
• Is the chassis plastic or metal? It is laser-cut acrylic. Please peel off the brown paper protection layer before assembly!
• Can it drive outdoors? It works on smooth pavement, but the small wheels will struggle in tall grass or gravel.
• What app do I use? There are many free "Arduino Bluetooth Car" apps on the Play Store.
• Is the Arduino an original? It is a high-quality compatible board (Clone) that functions identically to the original.
• Does it support Python? Not natively on the Uno. You would need to upgrade to a Raspberry Pi or ESP32 for Python.
• Why is my Bluetooth not pairing? Default pin is usually 1234 or 0000. Ensure the red LED on the module is blinking.
• Can I add a robotic arm later? Yes, the top plate is spacious enough to mount a small 3-4 servo robotic arm.
• Is this suitable for a 10-year-old? Yes, with adult supervision for the wiring parts.
• What if a part is missing? Our Probots™ QC-Pass ensures completeness, but contact support immediately if anything is amiss.
• Can I use a 9V battery? A standard rectangular 9V battery is too weak. It will spin the wheels in the air but stall on the ground. Use Li-ion.