# nRF52 e-paper tag: reconstructing an undocumented display interface

> nRF52 e-paper tag reconstructs control of an undocumented electronic shelf label with an nRF52832 board and SSD1675A-class panel. The repository records the pinout, 9-bit SPI connection, waveform-table layout and refresh behavior, and provides replacement Zephyr firmware plus a portable C99 display driver.

- Type: Case study
- Targets: Firmware · Protocol
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-06
- Original resource: <https://github.com/niazlv/nrf52-eink-price-tag>
- Primary source: <https://github.com/niazlv/nrf52-eink-price-tag/blob/ac789f2f103a1d9da4054076496d0921379e5a0b/README.md>
- Catalog page: <https://awesomerea.org/resources/nrf52-eink-price-tag-case/>
- Record JSON: <https://awesomerea.org/resources/nrf52-eink-price-tag-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/nrf52-eink-price-tag-case/index.md)

## Requirements & limits

- **Prerequisites:** The documented hardware uses an nRF52832, HINK-E029A10-A3 panel and ESL.CB-LR.010-00C.203 board.
- **Prerequisites:** The first installation requires SWD programming; building requires nRF Connect SDK v3.0.1.
- **License:** MIT license.

## Primary sources

1. <https://github.com/niazlv/nrf52-eink-price-tag/blob/ac789f2f103a1d9da4054076496d0921379e5a0b/README.md>
2. <https://github.com/niazlv/nrf52-eink-price-tag/blob/ac789f2f103a1d9da4054076496d0921379e5a0b/LICENSE>

## More in Firmware and hardware

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## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.