# EPD-nRF5

E-paper display calendar firmware with support for Chinese lunar calendar, solar terms, and holiday schedules. It can also transmit images via Bluetooth to the e-paper display for use as a digital photo frame. The calendar interface is adapted for common 4.2-inch and 7.5-inch e-paper resolutions, and the same firmware can drive different screen sizes (screen size and driver can be switched online through the web interface).

Supported MCUs: `nrf51822` / `nrf51802` / `nrf52811` / `nrf52810`. For e-paper displays, it supports common `UC81xx` / `SSD16xx` series drivers (black & white / 3-color / 4-color). It also supports custom pin mapping from the e-paper display to the MCU, sleep/wake functionality (NFC / wireless charger), and Bluetooth OTA firmware updates.

![](docs/images/3.jpg)

## Web Interface

This project includes a web-based interface implemented using Web Bluetooth API. You can use it on your phone or computer by visiting the URL below, or by directly double-clicking `html/index.html` locally.

- URL: https://tsl0922.github.io/EPD-nRF5
- Demo Video: https://www.bilibili.com/video/BV1KWAVe1EKs
- Discussion Group: [1033086563](https://qm.qq.com/q/SckzhfDxuu) (Click the link to join the chat group)

![](docs/images/0.jpg)

The web interface supports multiple image dithering algorithms and allows you to doodle on images and add text. In addition to displaying images as a digital photo frame, it can also switch to calendar mode to display monthly calendars, Chinese lunar calendar solar terms, holidays, and work schedule adjustments.

## Supported Devices

[View Documentation](docs/devices.md).

## Development

[View Documentation](docs/develop.md).

## Acknowledgments

This project uses or references code from the following projects:

- [ZinggJM/GxEPD2](https://github.com/ZinggJM/GxEPD2)
- [waveshareteam/e-Paper](https://github.com/waveshareteam/e-Paper)
- [atc1441/ATC_TLSR_Paper](https://github.com/atc1441/ATC_TLSR_Paper)