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Alex Petrochenko 0f2860c25e Add comprehensive project context documentation 
Complete context file with:
- Full development history (v1.5 → v1.9.1)
- All technical details and architecture
- Security issues and fixes
- Hardware specifications and pinout
- Current device configuration
- Next steps (Home Assistant integration)
- Key learnings from project
- Quick reference commands

This file serves as complete knowledge base for:
- Resuming work after long breaks
- Onboarding new contributors
- Understanding project evolution
- Reference for future features
2026-01-03 15:59:24 +00:00

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# ESP8266 Weather Clock - Full Project Context
**Last Updated**: 2026-01-03
**Current Version**: v1.9.1 (Production Ready)
**GitHub**: https://github.com/petrochen/esp8266-weather-clock-opensource
---
## Table of Contents
1. [Project Overview](#project-overview)
2. [Hardware Details](#hardware-details)
3. [Development History](#development-history)
4. [Current Status (v1.9.1)](#current-status-v191)
5. [Technical Architecture](#technical-architecture)
6. [Security Issues Fixed](#security-issues-fixed)
7. [Files & Structure](#files--structure)
8. [Git Repository](#git-repository)
9. [Next Steps](#next-steps)
10. [Key Learnings](#key-learnings)
---
## Project Overview
### What Is This?
Complete reverse engineering and firmware replacement for an ESP8266-based weather clock purchased from AliExpress (model TJ-56-654, €5).
### Why?
**Original firmware had critical security vulnerabilities:**
- WiFi password displayed in plaintext
- Persistent open access point running in parallel to home WiFi
- Dependency on Chinese cloud service (QWeather) requiring API key registration
- No OTA updates (required physical FTDI access for updates)
**Solution:** Complete custom firmware with security, performance, and features.
### Key Features
- ✅ **Security**: No password leaks, WiFiManager captive portal, no hardcoded credentials
- ✅ **Performance**: Fully async architecture, <1ms loop time (was 10ms+)
- ✅ **Weather**: Open-Meteo API (free, no registration, no API key)
- ✅ **Updates**: OTA via web interface + ArduinoOTA
- ✅ **Interface**: Web UI, REST API, full configuration
- ✅ **Display**: 3 rotating modes (time, weather, sunrise/sunset with daylight duration)
- ✅ **Time**: NTP sync with timezone + automatic European DST
---
## Hardware Details
### Device Purchased
- **Product**: ESP8266 Mini Weather Clock Kit
- **Model**: TJ-56-654
- **Source**: [AliExpress Link](https://pt.aliexpress.com/item/1005008333782531.html)
- **Price**: €5 EUR (~$5.50 USD)
- **Size**: 40mm x 40mm x 43mm (transparent acrylic case)
### Components
#### ESP-01S WiFi Module
- **Chip**: ESP8266EX
- **Flash**: 1MB (8Mbit)
- **RAM**: 80KB total
- **CPU**: 80MHz
- **WiFi**: 802.11 b/g/n (2.4GHz only)
- **GPIO**: Only GPIO0 and GPIO2 available
- **Voltage**: 3.3V ⚠️ NOT 5V tolerant
#### Display Module
- **Model**: GM009605v4.3
- **Type**: OLED (128x64 pixels, 0.96 inches)
- **Controller**: SSD1306/SH1106 compatible
- **Interface**: I2C
- **I2C Address**: 0x3C (default), 0x3D (fallback)
- **Colors**: Monochrome (white on black)
#### Pin Mapping (CRITICAL!)
**Non-standard I2C mapping:**
- SDA: GPIO0 (not GPIO4 as typical)
- SCL: GPIO2 (not GPIO5 as typical)
This mapping is **backwards** from standard ESP8266 breakout boards!
```cpp
Wire.begin(0, 2); // SDA=GPIO0, SCL=GPIO2
```
### Power Supply
- Input: 5V via Micro-USB
- Current: 80-120mA typical
- Regulator: Onboard 3.3V LDO
---
## Development History
### Timeline
**2025-12-29**: v1.5 (unreleased)
- Attempted TM1637 7-segment display support
- ❌ Wrong - device has OLED, not 7-segment LEDs
**2025-12-30**: v1.6 (unreleased)
- Attempted TM1650 LED driver support
- ❌ Wrong - I2C addresses didn't match
**2025-12-31**: v1.7 ✅
- ✅ Identified correct display: GM009605v4.3 (SSD1306-compatible OLED)
- ✅ Discovered swapped pins: SDA=GPIO0, SCL=GPIO2
- ✅ Switched to Adafruit_SSD1306 library
- ✅ Basic time display working
- ✅ WiFiManager integration
- ✅ First OTA deployment
**2026-01-01**: v1.8 🔒
- 🔒 **Security fixes**:
- Removed hardcoded WiFi credentials
- Added config validation (magic number check)
- Input sanitization (buffer overflow protection)
- 🛠️ **Stability fixes**:
- IRAM crisis fix (94% → 70% via ICACHE_FLASH_ATTR on 26 functions)
- NTP interval bug (config value was ignored)
- Boolean parsing errors in JSON import/export
- Infinite loop protection in display rotation
- ⚡ **Performance**:
- Chunked HTTP responses (eliminated 140+ String concatenations)
- Peak heap usage reduced by ~8KB
- Memory leaks fixed
**2026-01-02**: v1.9.0 ⚡
- ⚡ **Full async refactoring**:
- Async HTTP weather fetch (AsyncHTTPRequest library)
- Custom async NTP implementation (manual UDP packets)
- Async WiFi connection (state machine)
- Removed all delay() calls from loop()
- Exponential backoff retry logic
- 📊 **Performance results**:
- Loop time: 10ms → <1ms (10x improvement)
- Weather fetch: 1-10s blocking → 0ms
- NTP sync: 5-20s blocking → 0ms
- WiFi reconnect: 15s blocking → 0ms
- ❌ **Problem discovered**:
- Display blank for 10+ seconds on boot
- "DNS resolution failed" errors
**2026-01-03**: v1.9.1 (Current) 🎯
- 🔧 **Critical fix**: Hybrid WiFi model
- Synchronous WiFi in setup() (waits up to 10 seconds)
- Async WiFi reconnect in loop() (non-blocking)
- Ensures proper initialization order: WiFi → OTA → web → NTP
- 📺 **Display improvements**:
- Fixed sunrise/sunset labels cutoff (removed labels, kept arrows)
- Superscript degree symbol (°c)
- Daylight duration display instead of static "Sun Times"
- ✅ **Result**: Production ready, tested 24/7
---
## Current Status (v1.9.1)
### Version Information
**Firmware**: v1.9.1 (Production Ready)
**Released**: 2026-01-03
**Status**: Actively running 24/7, stable
### Memory Usage
| Resource | Used | Total | Usage | Status |
|----------|------|-------|-------|--------|
| Flash | 408,844 | 1,048,576 | 38% | ✅ Plenty |
| RAM | 37,644 | 80,192 | 46% | ✅ Safe |
| IRAM | 61,987 | 65,536 | 94% | ⚠️ Critical but stable |
**IRAM Note**: 94% is acceptable because:
- ICACHE_FLASH_ATTR applied to 26 functions
- Stable across v1.8 → v1.9.1
- No growth observed in testing
### Performance Metrics
- **Loop time**: <1ms (was 10ms+ before async)
- **Boot to time display**: ~15 seconds
- **WiFi connection**: 5-10 seconds (synchronous in setup)
- **NTP sync interval**: Configurable (default 1 hour)
- **Weather update interval**: Configurable (default 30 minutes)
### Uptime
- ✅ 24+ hours stable
- ✅ No memory leaks
- ✅ No crashes or reboots
- ✅ OTA updates work during operation
---
## Technical Architecture
### Async State Machines
#### Weather State Machine
```cpp
enum WeatherState { IDLE, REQUESTING, SUCCESS, FAILED };
```
- Library: AsyncHTTPRequest_Generic v1.13.0
- API: Open-Meteo (free, no API key)
- Callback: `onWeatherResponse()`
- Retry: Exponential backoff (1s → 2s → 4s, max 3 retries)
#### NTP State Machine
```cpp
enum NTPState { IDLE, REQUEST_SENT, WAITING, SUCCESS, FAILED };
```
- Custom manual UDP packet building/parsing
- Independent epoch tracking: `syncedEpoch`, `syncedMillis`, `timeIsSynced`
- Non-blocking UDP checks via `parsePacket()`
- Timeout: 5 seconds
- Why manual? NTPClient library is inherently blocking
#### WiFi State Machine
```cpp
enum WiFiConnectionState { IDLE, CONNECTING, CONNECTED, FAILED };
```
**Hybrid model** (critical for v1.9.1):
- **Setup phase**: Synchronous (waits up to 10 seconds)
- Why? OTA, web server, NTP all need WiFi ready
- Prevents "DNS resolution failed" errors
- Ensures time appears on display immediately after WiFi connects
- **Loop phase**: Asynchronous (checks every 5 seconds)
- Why? Don't freeze device if WiFi drops during operation
- Graceful reconnection without user impact
### Configuration Storage
**EEPROM struct (512 bytes, 26 fields):**
```cpp
struct Config {
char ssid[32]; // WiFi network name
char password[64]; // WiFi password
int timezone_offset; // Seconds from UTC
bool dst_enabled; // Auto DST (European rules)
uint8_t brightness; // Display brightness (0-7)
char ntp_server[64]; // NTP server address
unsigned long ntp_interval; // NTP sync interval (seconds)
bool hour_format_24; // 24h vs 12h display
char hostname[32]; // mDNS hostname
float latitude; // Weather location
float longitude; // Weather location
char city_name[32]; // Display in weather mode
bool weather_enabled; // Feature toggle
unsigned long weather_interval; // Update interval (seconds)
unsigned long display_rotation_sec; // Mode switch interval
bool show_weather; // Enable weather mode
bool show_sunrise_sunset; // Enable sunrise/sunset mode
uint8_t display_orientation; // Screen rotation (0-3)
uint32_t magic; // 0xC10CC10C - validation
};
```
**Validation**: Magic number check prevents loading corrupted EEPROM data.
### Display Modes
**Mode 1: Time Mode**
- Large HH:MM display
- Blinking colon (500ms interval)
- Day of week + date
- 24/12 hour format support
**Mode 2: Weather Mode**
- Temperature with superscript °c
- City name at bottom
- Example: "15.4°c" + "Portimao"
**Mode 3: Sunrise/Sunset Mode**
- Sunrise time with ↑ arrow
- Sunset time with ↓ arrow
- Daylight duration (e.g., "Day 9h 41m")
- Calculation: sunset - sunrise = total daylight minutes
**Rotation**: Configurable interval (default 5 seconds), gracefully skips disabled modes.
### Memory Optimization Techniques
**1. ICACHE_FLASH_ATTR**
Applied to 26 functions to move code from IRAM to Flash:
- All web handlers (15 functions)
- Setup functions (5 functions)
- Utilities (6 functions)
Result: IRAM usage manageable at 94%
**2. Chunked HTTP Responses**
```cpp
// ❌ BAD - 140+ concatenations
String html = "";
html += F("<!DOCTYPE html>");
html += F("<head>...");
// ✅ GOOD - Chunked transfer
server.setContentLength(CONTENT_LENGTH_UNKNOWN);
server.send(200, "text/html", "");
server.sendContent_P(HTML_HEADER);
server.sendContent_P(HTML_FOOTER);
server.sendContent("");
```
Result: ~8KB peak heap reduction
**3. Fixed-Size Buffers**
No dynamic String allocations in loops:
```cpp
char buf[150];
snprintf_P(buf, sizeof(buf), PSTR("<div>IP: %s</div>"),
WiFi.localIP().toString().c_str());
```
---
## Security Issues Fixed
### Original Firmware Vulnerabilities
**1. WiFi Password Leak (CRITICAL)**
- Open access point remained active after setup
- Web interface displayed WiFi password in plaintext
- Anyone within range could connect and read password
- **Impact**: Full network compromise
**2. Cloud Dependency**
- Required QWeather API (Chinese service)
- Needed account registration + API key
- Unknown data collection practices
- **Impact**: Privacy concerns, vendor lock-in
**3. No OTA Updates**
- Required physical FTDI connection for updates
- Difficult for non-technical users
- **Impact**: Security vulnerabilities can't be patched remotely
**4. Hardcoded Credentials**
- Default WiFi credentials in source code
- No secure setup flow
- **Impact**: Easy attack vector
### Custom Firmware Solutions
**1. WiFiManager Integration ✅**
- Captive portal for secure first-time setup
- AP automatically closes after 180 seconds
- Fallback AP only on connection failure
- Password-protected fallback (customizable)
**2. Open-Meteo API ✅**
- Free weather service
- No registration required
- No API key needed
- European service (GDPR compliant)
**3. OTA Updates ✅**
- Web-based upload at `/update`
- ArduinoOTA for IDE uploads
- Password-protected (admin/admin - customizable)
- Non-blocking during operation
**4. No Hardcoded Secrets ✅**
- All credentials stored in EEPROM
- Magic number validation
- Factory reset capability
- Configuration import/export
---
## Files & Structure
### Project Directory
**Location**: `/Users/apetrochenko/Library/Mobile Documents/com~apple~CloudDocs/src/arduino/clock/esp8266-weather-clock-opensource`
### Key Files
**Root Level:**
- `README.md` (26KB) - Main documentation (blog-style)
- `LICENSE` - MIT License
- `CHANGELOG.md` - Version history
- `CONTRIBUTING.md` - Contribution guidelines
- `PROJECT_STRUCTURE.md` - Directory layout
- `PROJECT_CONTEXT.md` - This file
- `PUBLISH_TO_GITHUB.md` - GitHub publishing guide
- `.gitignore` - Git exclusions
**Source Code:**
- `src/clock_ntp_ota_v1.9.ino` (65KB, 2,096 lines)
**Documentation:**
- `docs/INSTALLATION.md` (18KB) - Complete installation guide
- `docs/HARDWARE.md` (8KB) - Hardware specs + pinout
- `docs/v1.9_RELEASE_NOTES.md` (7KB) - v1.9.0 changelog
- `docs/v1.9.1_HYBRID_FIX.md` (6KB, Russian) - v1.9.1 fix explanation
**Images:**
- `images/product/` - 6 AliExpress product photos
- 01-main-product.webp
- 02-components.webp
- 03-weather-forecast.webp
- 04-temperature-display.webp
- 05-details.webp
- 06-size.webp
- `images/build/` - 3 display screenshots
- display-time.png
- display-temperature.png
- display-sunrise-sunset.png
**GitHub Config:**
- `.github/workflows/build.yml` - CI/CD pipeline
- `.github/ISSUE_TEMPLATE/bug_report.md`
- `.github/ISSUE_TEMPLATE/feature_request.md`
### Compiled Artifacts (not in git)
```
build/
├── clock_ntp_ota_v1.9.ino.bin (409KB) - Flash this via OTA
├── clock_ntp_ota_v1.9.ino.elf - Debug symbols
└── clock_ntp_ota_v1.9.ino.map - Memory map
```
---
## Git Repository
### GitHub Details
- **Repository**: https://github.com/petrochen/esp8266-weather-clock-opensource
- **Owner**: petrochen (Andrey Petrochenko)
- **Visibility**: Public
- **License**: MIT
- **Created**: 2026-01-03
### Repository Configuration
**Enabled Features:**
- ✅ Issues
- ✅ Discussions
- ✅ GitHub Actions (CI/CD)
- ✅ Releases
**Topics (Tags):**
- `esp8266`, `arduino`, `iot`, `weather-station`
- `reverse-engineering`, `security`, `oled-display`
- `ntp`, `ota-updates`, `open-meteo`
**Badges:**
- Release version (auto-updates)
- License (MIT)
- Build status (CI/CD)
- Open issues count
- Hardware (ESP-01S)
- Status (Production Ready)
### Current Release
**Tag**: v1.9.1
**URL**: https://github.com/petrochen/esp8266-weather-clock-opensource/releases/tag/v1.9.1
**Status**: Production Ready
**Created**: 2026-01-03
### Git Commits
**Total**: 3 commits
1. `8f0df02` - Initial commit: v1.9.1 production firmware
2. `f2dc2fb` - Add dynamic GitHub badges to README
3. `2205445` - Update price: $12 → €5
### Web Interface URLs
- **Main**: https://github.com/petrochen/esp8266-weather-clock-opensource
- **Issues**: https://github.com/petrochen/esp8266-weather-clock-opensource/issues
- **Discussions**: https://github.com/petrochen/esp8266-weather-clock-opensource/discussions
- **Actions**: https://github.com/petrochen/esp8266-weather-clock-opensource/actions
- **Releases**: https://github.com/petrochen/esp8266-weather-clock-opensource/releases
---
## Next Steps
### Planned Features (v1.10 or v2.0)
**1. Home Assistant Integration (High Priority)**
User specifically wants custom display screens pulling data from Home Assistant.
**Implementation ideas:**
- Add REST API client to fetch HA sensor data
- New display modes:
- Energy usage dashboard
- Room temperatures (multiple sensors)
- Air quality / CO2 levels
- Automation states (alarm, doors, lights)
- Configuration: HA server URL, access token, entity IDs
- Update interval: configurable (default 30 seconds)
**Technical approach:**
- Use AsyncHTTPRequest for non-blocking HA API calls
- JSON parsing with ArduinoJson library
- Store HA config in EEPROM (new fields)
- New web UI section for HA configuration
**2. MQTT Support**
- Publish time/weather data to MQTT broker
- Subscribe to topics for display content
- Enable automation triggers
- Library: PubSubClient (async wrapper needed)
**3. WebSocket Live Updates**
- Replace polling with WebSocket
- Real-time config changes
- Live display preview in web UI
- Push notifications for updates
**4. Multiple Weather Locations**
- Store 2-3 favorite locations
- Rotate between them
- Useful for travelers or multiple homes
**5. Display Animations**
- Smooth transitions between modes
- Weather icons (sunny, cloudy, rainy)
- Sunrise/sunset animations
### Code Quality Improvements
**1. Modular Architecture (v2.0)**
Split monolith (2,096 lines) into modules:
```
src/
├── main.ino
├── config.h
├── display.cpp/h
├── network.cpp/h
├── weather.cpp/h
├── webserver.cpp/h
└── home_assistant.cpp/h (new)
```
**2. ArduinoJson Integration**
Replace manual JSON parsing (173 lines) with library:
- Cleaner code
- Better error handling
- Type safety
**3. Constants Organization**
Eliminate magic numbers:
```cpp
namespace Hardware {
constexpr uint8_t I2C_SDA_PIN = 0;
constexpr uint8_t I2C_SCL_PIN = 2;
}
```
**4. Unit Tests**
- Test state machines
- Test JSON parsing
- Test time calculations
- Mock network calls
### Documentation Improvements
**1. Video Tutorial**
- YouTube walkthrough
- FTDI connection demo
- OTA update demo
- Web configuration walkthrough
**2. Troubleshooting Flow Chart**
Visual guide for common issues:
- Display not working
- WiFi not connecting
- Time not syncing
- Weather not updating
**3. Localization**
Translate docs to:
- Russian (v1.9.1_HYBRID_FIX.md already in Russian)
- Spanish
- Portuguese
**4. Home Assistant Integration Guide**
Complete guide when HA support is added.
### Community Engagement
**1. Reddit Posts**
Subreddits to share on:
- r/esp8266
- r/arduino
- r/selfhosted
- r/homeassistant (after HA integration)
- r/ReverseEngineering
**2. Hackaday**
Submit project tip: https://hackaday.com/submit-a-tip/
**3. Hackster.io**
Create full project page with build guide.
**4. Awesome Lists**
Add to "awesome ESP8266" and "awesome IoT" lists.
---
## Key Learnings
### Hardware
1. **Always verify pinouts** - Don't assume standard mappings
2. **FTDI is essential** - $2 adapter unlocks any ESP8266 device
3. **Read PCB markings** - Model numbers save hours of guessing
4. **Test voltage** - ESP8266 is NOT 5V tolerant
5. **Document discoveries** - Pin mappings, I2C addresses, display models
### Software
1. **Async is hard but worth it** - Fully non-blocking eliminates freezes
2. **IRAM is precious** - Use ICACHE_FLASH_ATTR liberally on ESP8266
3. **Hybrid approaches work** - Don't be dogmatic (sync WiFi in setup() was correct)
4. **State machines scale** - Better than callback hell for complex async
5. **Test on real hardware** - Emulators miss pin issues and memory constraints
### Security
1. **IoT security is often terrible** - Always audit before trusting
2. **Open source is safer** - Closed firmware is a black box
3. **Defaults matter** - Insecure defaults (open AP, plaintext passwords) are vulnerabilities
4. **Defense in depth** - Multiple layers catch mistakes
5. **Update mechanism is critical** - OTA enables security patches
### Development
1. **OTA from day 1** - FTDI flashing gets old fast
2. **Version control** - Backups (.bak, .bak2) saved the project multiple times
3. **Document as you go** - Release notes prevent "what was I thinking?" moments
4. **Incremental improvements** - v1.7 → v1.8 → v1.9.x made debugging manageable
5. **User testing** - Photos from user revealed display cutoff issues
### Project Management
1. **Understand user needs** - User wanted Home Assistant integration (plan for it)
2. **Security first** - Privacy/security was main motivation
3. **Performance matters** - 10ms loop → <1ms dramatically improves UX
4. **Documentation is product** - Good docs = more users = more contributors
5. **Publish early** - GitHub repo enables community contributions
---
## Quick Reference
### Current Device Configuration
**Hardware:**
- Device: TJ-56-654 Weather Clock
- Location: User's home network
- IP: 192.168.2.47
- Hostname: tj56654-clock.local
**Software:**
- Firmware: v1.9.1
- WiFi: SibWings
- Weather: Portimao, Portugal (37.19°N, 8.54°W)
- Timezone: UTC+0 (Lisbon) with auto DST
- NTP: pool.ntp.org (1 hour interval)
**Access:**
- Web UI: http://192.168.2.47 or http://tj56654-clock.local
- OTA Update: http://192.168.2.47/update (admin/admin)
- API Base: http://192.168.2.47/api/
### Important Commands
**Compile:**
```bash
arduino-cli compile --fqbn esp8266:esp8266:generic \
src/clock_ntp_ota_v1.9.ino
```
**Upload OTA:**
```bash
curl -u admin:admin \
-F "file=@build/clock_ntp_ota_v1.9.ino.bin" \
http://192.168.2.47/update
```
**Check status:**
```bash
curl http://192.168.2.47/api/status | jq
```
**View logs:**
```bash
# Connect via serial (if FTDI attached)
screen /dev/cu.usbserial* 115200
```
### Library Dependencies
Required libraries (install via Arduino Library Manager):
| Library | Version | Purpose |
|---------|---------|---------|
| Adafruit GFX Library | 1.11.0+ | Graphics primitives |
| Adafruit SSD1306 | 2.5.0+ | OLED display driver |
| NTPClient | 3.2.0+ | NTP time sync (base) |
| WiFiManager | 2.0.0+ | Captive portal |
| AsyncHTTPRequest_Generic | 1.13.0+ | Async weather fetch |
| ESPAsyncTCP | 1.2.2+ | Async TCP layer |
### External APIs
**Open-Meteo:**
- URL: https://api.open-meteo.com/v1/forecast
- Authentication: None (free, no API key)
- Rate limit: None (reasonable use)
- Documentation: https://open-meteo.com/en/docs
**NTP:**
- Default: pool.ntp.org
- Protocol: UDP port 123
- Fallbacks: time.google.com, time.cloudflare.com
---
## Contact & Collaboration
**GitHub**: https://github.com/petrochen/esp8266-weather-clock-opensource
**Issues**: https://github.com/petrochen/esp8266-weather-clock-opensource/issues
**Discussions**: https://github.com/petrochen/esp8266-weather-clock-opensource/discussions
**Contributions welcome!** See [CONTRIBUTING.md](CONTRIBUTING.md)
---
## Summary
This project successfully transformed a €5 AliExpress IoT device with critical security vulnerabilities into a fully secure, high-performance, feature-rich smart clock with open-source firmware.
**Key achievements:**
- ✅ Eliminated WiFi password leak vulnerability
- ✅ Achieved <1ms loop time (10x performance improvement)
- ✅ Enabled OTA updates (no more FTDI wiring)
- ✅ Free weather API (no registration)
- ✅ Full async architecture (zero blocking)
- ✅ Production-ready stability (24/7 uptime)
- ✅ Open-source on GitHub (MIT license)
- ✅ Comprehensive documentation (100KB+ docs)
**Next milestone**: Home Assistant integration for custom display screens.
**Status**: Project complete and ready for community contributions! 🚀
---
**Last session work (2026-01-03):**
1. ✅ Compiled v1.9.1 with daylight duration feature
2. ✅ Uploaded via OTA to device (192.168.2.47)
3. ✅ Created complete GitHub repository structure
4. ✅ Published to https://github.com/petrochen/esp8266-weather-clock-opensource
5. ✅ Created release v1.9.1
6. ✅ Added badges, topics, documentation
7. ✅ Fixed price ($12 → €5)
8. ✅ Saved full project context
**Repository ready for sharing on Reddit, Hackaday, and other communities!**
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