Otto Formula Racing Car – Modular Chassis for HP Robots Otto

🏎 Otto Racing Car – 3D Printable Chassis🏎

Transform your Otto robot into a mini autonomous racing car with obstacle detection and track-driving capabilities.

This lightweight chassis, inspired by Formula racing cars, gives Otto a completely new look while preserving all original electronics and sensors. The front ultrasonic sensor acts as the driver’s eyes, enabling the robot to detect obstacles and react in real time.

This project demonstrates how the Otto platform can be extended into creative STEM robotics applications.

⚡ Features

• 🏁 Formula-style racing chassis

• 🤖 Fully compatible with HP Robots Otto platform

• 🔧 Uses original Otto electronics and wheels

• 🚧 Obstacle detection with LED warning system

• ⛔ Automatic stop when obstacle is too close

• ▶ Auto-resume after obstacle removal

• 🎮 Manual control via virtual joystick (Wi-Fi)

• 🎓 Perfect for STEM / educational projects

🧠 How It Works

The Otto robot is mounted inside the chassis and secured using two connectors.

• The front support wheel allows smooth “car-like” movement

• The ultrasonic sensor detects obstacles:

  • 🔴 LEDs flash red when approaching an obstacle

  • ⛔ Robot stops when too close

  • ▶ Continues driving after obstacle is removed

• 💡 White LEDs on the sensor can be turned on/off

• 🎮 Manual control is available via web interface (joystick)

🛠 Assembly

1. Move the support wheel to the front position

2. (Optional) Replace the wheels with included racing versions

3. Insert the Otto robot into the chassis

4. Secure it using the two connectors

5. Upload the control code (main.py) using Arduino Lab for MicroPython

6. No screws or glue required

🖨 Printing

Recommended settings:

• Layer height: 0.2 mm

• Infill: 15–20%

• Supports: not required

• Material: PLA / PETG

All STL files are pre-oriented for optimal printing.

🎨 You can mix colors for all parts.

Create your own unique racing team design!

🎨 Custom Nose Logo (Modular Insert)

The lightning symbol on the nose is a separate interchangeable insert.

You can easily create your own custom logo 👇

How to create your own logo (Inkscape + Tinkercad)

1. Create/import logo in Inkscape (SVG)

2. Save as Plain SVG

3. Add outline (~0.4 mm stroke)

4. Convert: Path → Stroke to Path

5. Merge: Path → Union

6. Export SVG

7. Import into Tinkercad

8. Set height to ~2 mm

9. Export as STL and use as nose insert

👉 Design your own racing team logo!

💻 Software

Control code (main.py) available on GitHub:
👉https://github.com/lwodniak/OttoHPRacingCar

Features:

• Wi-Fi control panel (192.168.4.1)

• Virtual joystick

• Lights + buzzer control

• Line follower mode

• Obstacle detection system

🏆 Contest Entry

This project was created for the HP Robots Otto Remix Challenge on Printables.

🔥 Tip

For best experience:

• Use the included STL file for correct orientation

• Combine bright colors for a real racing look