¶ Scroll Wheel
A large, high-resolution scroll wheel inspired by Engineer Bo's YouTube video.
⚠️ Early Development Phase
This project is still under development. Use at your own risk.
¶ Github Page
¶ 🔧Hardware Overview
- Main Controller: ESP32 (subject to maybe change later)
- Magnetic Encoder: AS5600
- Battery Pack: S3P2 NiMH Eneloop cells
¶ 💻 Software Architecture
The entire functionality is now handled by a single ESP32 microcontroller using BLE HID (Human Interface Device) mode.
- The scroll wheel inputs are directly interpreted by the ESP32.
- Input data (e.g. rotation) is sent over Bluetooth Low Energy as HID events, emulating a native scroll device.
- No additional driver or software is needed on the PC — it works like a standard Bluetooth mouse/scroll input.
✅ This simplifies the setup significantly and increases compatibility across Linux, Windows, and macOS.
¶ 🧩 Required Components
| Part | Quantity |
| Main PCB (pre-soldered) | 1 |
| Bearing (65x85x10 mm) | 1 |
| JST GH Cable Kit | 1 |
| Cylinder Magnets (3x12 mm) | 7 |
| 3D-Printed Parts | 3 |
| S3P2 NiMH Battery Pack | 1 |
| M2x5 Screws | 5 |
¶ 🛠️ Build Guide
¶ 🔄 Bearing Preparation
Factory bearings may feel stiff due to thick grease. Here's how to optimize smoothness:
- Remove both sealing rings.
- Soak the bearing in isopropyl alcohol (or another grease remover).
- Scrub out all remaining grease.
- Let it dry for ~3 hours.
- Reinstall one sealing ring.
- Add light machine oil generously into the bearing.
- Reinstall the second sealing ring.
- Spin the bearing multiple times to distribute the oil.
- (Optional) Remove the seals again for an even smoother feel (at the cost of losing dust protection).
¶ 🚧 Development Gallery
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¶ 🤝 Contributing
Pull requests, suggestions, and feedback are always welcome — feel free to get involved and help improve the project!
Prototyping and hardware development can get expensive quickly, so if you’d like to support the project financially, look at my Sponsoring Page
Every bit helps keep the ideas (and soldering irons) running!
¶ Credits
Credits to T-vk for creating the ESP32 BLE Mouse Library
Big thanks to the fsfe for having me with this Project