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https://github.com/kevin-pottier/rpen

RPEN - Connected Pen 🖊️✨ A smart pen that lets you write or draw remotely on a TFT screen via Bluetooth. Features include customizable colors and sizes, motion detection with MPU6050, and real-time feedback via RGB LED. Built with a Bluepill microcontroller, it's perfect for education and creative projects. Open-source and innovative! 🚀
https://github.com/kevin-pottier/rpen

c-language educational-project embedded-systems graphics i2c ili9341 led-matrix microcontroller mpu6050 stm32 tft-display uart-communication uart-communication-protocol

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RPEN - Connected Pen 🖊️✨ A smart pen that lets you write or draw remotely on a TFT screen via Bluetooth. Features include customizable colors and sizes, motion detection with MPU6050, and real-time feedback via RGB LED. Built with a Bluepill microcontroller, it's perfect for education and creative projects. Open-source and innovative! 🚀

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README 

        
# 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](https://github.com/Kevin-Pottier)**:

- **[Julien RACKI](https://github.com/juickar)**:



## 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](https://github.com/JegHeterKevin1)

Email : [email protected]