RPEN - Connected Pen

RPEN (Remote Pen & Air Pen) is an innovative connected pen project developed as part of the DEEP (Digital Embedded Electronics Project) program at ESEO. This pen allows users to write on a screen remotely via Bluetooth, providing a practical and interactive solution for teaching or creative applications.

Features

• Remote Writing: The pen uses position sensors to capture movements and transcribe them onto a TFT screen.
• Interactive Modes:
  • Writing Mode: Draw with customizable colors and sizes.
  • Calibration Mode: Re-center the cursor on the screen.
  • Erase Mode: Remove drawings by overlaying white lines.
• Style Customization:
  • Modify drawing size and color via dedicated buttons.
• Interactive Screen: The pen pairs with a TFT screen controlled by a microcontroller receiving data via UART Bluetooth.

Technical Specifications

Hardware

• Connected Pen:
  • Microcontroller based on the Bluepill board.
  • MPU6050 sensor for motion detection.
  • WS2812S RGB LED for indicating the current color.
  • Buttons for functionality control.
• TFT Screen:
  • Controlled via SPI.
  • UART Bluetooth interface for receiving data.

Software

• Data Transmission:
  • Motion data and parameters (color, size, mode) are sent as Bluetooth frames.
• Core Algorithm:
  • The pen stores motion and parameters in variables.
  • The screen interprets the data to draw or perform the corresponding actions.

Usage

Pen Controls

• Button 1: Writing mode.
• Button 2: Change size or color.
• Button 3: Erase the screen or activate erase-by-drawing mode.

To navigate the menus, tilt the pen in the desired direction, similar to a Wii controller.

Tests

The project underwent various tests:

• Verification of the microcontroller’s power supply.
• Display testing on the TFT screen.
• Changing colors and sizes using buttons.
• Bluetooth functionality for data transmission.

Contributions

Developers

• Kevin POTTIER:
• Julien RACKI:

Potential Improvements

• Reduce noise from the MPU6050 sensor data using low-pass filters.
• Optimize Bluetooth frame processing.
• Improve motion precision for smoother control.

License

This project is open for educational and experimental purposes. Any reuse must include proper attribution.

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Note: Associated files, including the PCB schematic and the CAD design of the pen case, are available upon request.

To request access, please contact me at:

📧 Kévin Pottier
GitHub: https://github.com/JegHeterKevin1 Email : [email protected]