4WD Smart Car Chassis Kit – Double Layer Longer Version

The 4WD Smart Car Chassis Kit – Longer Version is a complete mechanical foundation for building four-wheel-drive robots. Made from transparent acrylic, this extended double-decker chassis gives you significantly more deck space than the standard version — ideal for projects that need multiple sensors, a motor driver board, a battery holder, and a microcontroller all on the same platform without crowding.

This 4WD Smart Car Chassis Kit includes four geared DC motors, rubber wheels, encoder discs, brass standoffs, and all fasteners — start assembling immediately. Perfectly suited for Arduino, ESP32, Raspberry Pi, and STM32-based robotics projects for beginners and engineering students alike.

Why Choose the Longer Version?

• Extended top deck (255 × 150 mm) — more surface area for motor drivers, battery holders, and sensor arrays vs. the standard chassis
• Generous inter-deck clearance — 30mm brass spacers create ample vertical space between layers for tidy cable routing
• Same proven drivetrain — identical 200 RPM geared motors and 65mm rubber wheels as the standard 4WD Smart Car Chassis Kit

Key Features

• Transparent Acrylic Chassis — see-through design for easy wiring inspection and a clean look
• Double-Layer Structure — bottom layer for motors and battery; top layer for controller, driver board, and sensors
• 4 × Geared DC BO Motors (200 RPM, 3V–6V) — 1:48 reduction ratio delivers strong torque at low speed
• 4 × Velocimetry Encoder Discs — mount on motor shafts for wheel-speed measurement and closed-loop PID control
• 65mm Rubber Wheels — good grip on smooth floors, carpets, and light terrain
• Multiple M3 Mounting Holes — compatible with Arduino Uno, Mega, ESP32 Dev Board, Raspberry Pi form factors
• Brass Standoffs Included — L30+6 spacers for stable, pre-measured layer separation
• Easy Assembly — no soldering required; M3 screw-and-nut construction throughout
• Lightweight — ~400g assembled chassis (without electronics)

Technical Specifications

Compatible Controllers

This 4WD Smart Car Chassis Kit works with all popular microcontroller platforms:

• Arduino Uno / Nano / Mega
• ESP32 / ESP8266 Dev Boards
• Raspberry Pi (all models)
• STM32 Blue Pill / Black Pill

Recommended motor driver: L298N Dual H-Bridge or L293D Motor Driver Shield

What Can You Build?

• Line Following Robot — mount IR sensors beneath the chassis and use encoder feedback for precise turns
• Obstacle Avoidance Robot — attach an HC-SR04 ultrasonic sensor to the front deck
• Bluetooth / Wi-Fi RC Car — pair with an HC-05 module or ESP32 for wireless control from a phone
• PID Speed-Controlled Robot — use encoder discs with a motor driver for closed-loop velocity control
• FPV Camera Robot — mount an ESP32-CAM or Raspberry Pi Camera for live video streaming
• Maze-Solving Robot — combine with IR wall sensors for autonomous navigation

Assembly Notes

• No soldering required for chassis assembly
• Motor wires connect directly to motor driver terminals — no connectors to crimp
• Recommended power: 4 × AA batteries (6V total) or a 2S LiPo in a holder on the lower deck
• Estimated assembly time: 30–45 minutes for beginners

Package Contents

• 2 × Transparent Acrylic Chassis Plates (Upper + Lower Deck)
• 4 × Rubber Wheels (~65mm)
• 4 × Velocimetry Encoder Discs (Code Wheels for speed sensing)
• 4 × DC Geared BO Motors (200 RPM)
• 8 × M3×30 Screws
• 8 × Fasteners
• 6 × M3×8 Screws
• 8 × M3 Nuts
• 6 × L30+6 Brass Standoffs

Motor driver, microcontroller, battery, and sensors are not included.