# TJ-56-654 weather clock: replacement firmware after hardware and security analysis

> The TJ-56-654 weather-clock project replaces the original ESP-01S firmware after an investigation of the device's hardware and configuration page. The author reports that the original page exposed the Wi-Fi password; the replacement provides NTP time, Open-Meteo weather, OLED screens, a web settings panel, and updates on the clock's 1 MB flash device.

- Type: Case study
- Targets: Firmware
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/petrochen/esp8266-weather-clock-opensource>
- Primary source: <https://github.com/petrochen/esp8266-weather-clock-opensource/blob/4f3a7083080ebfd3bd1e0b1c835d3c867d2975e9/README.md>
- Catalog page: <https://awesomerea.org/resources/esp8266-weather-clock-case/>
- Record JSON: <https://awesomerea.org/resources/esp8266-weather-clock-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/esp8266-weather-clock-case/index.md)

## Requirements & limits

- **Prerequisites:** A TJ-56-654 or compatible ESP8266 weather clock; first flashing requires a 3.3 V USB-to-serial adapter and jumper wires.
- **Prerequisites:** The installation guide specifies Arduino IDE 1.8.19+ or 2.x and ESP8266 board support.
- **License:** MIT license.

## Primary sources

1. <https://github.com/petrochen/esp8266-weather-clock-opensource/blob/4f3a7083080ebfd3bd1e0b1c835d3c867d2975e9/README.md>
2. <https://github.com/petrochen/esp8266-weather-clock-opensource/blob/4f3a7083080ebfd3bd1e0b1c835d3c867d2975e9/docs/INSTALLATION.md>

## More in Firmware and hardware

- [Torso T-1: reconstructing the .t1 backup format](https://awesomerea.org/resources/t1-backup-file-format-case/index.md) · Case study
- [open-smc-pad: replacing M-Vave SMC-PAD firmware](https://awesomerea.org/resources/open-smc-pad-case/index.md) · Case study
- [Predator Sense for Linux: reconstructing PHN16-72 firmware control](https://awesomerea.org/resources/predator-sense-phn16-72-linux-case/index.md) · Case study
- [HH41V: reconstructing the GOTU/SUDH update process](https://awesomerea.org/resources/hh41v-fota-case/index.md) · Case study
- [Band 9 表盘生成器: Huawei Band 9 HWT watch-face format reconstruction](https://awesomerea.org/resources/band9-watchface-generator-case/index.md) · Case study
- [Echo Show camera: reconstructing LineageOS camera support](https://awesomerea.org/resources/echo-show-lineageos-camera-case/index.md) · Case study

## 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.