# 🌟 ESP32 GPS Clock & Weather Station

A precision timepiece that syncs with satellites and monitors your environment! 🛰️

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✨ Features

🕒 Time	GPS-synchronized precise timekeeping
🌡️ Environment	Temperature & humidity monitoring
🔆 Display	Auto-brightness & power saving
📱 Connectivity	WiFi with OTA updates

🌟 Project Highlights

⚡ Fast GPS Lock	🌙 Auto Brightness	🔄 OTA Updates
📱 WiFi Manager	🔋 Battery Backup	🌡️ Environment Monitor

🛠️ Hardware Requirements

Core Components 📋

Component	Purpose	Notes
ESP32 devkit v1	🧠 Controller	DOIT version recommended
BH1750	💡 Light sensor	I²C interface
BME280	🌡️ Environment	Temperature/Humidity
GPS Neo 6m	📡 GPS receiver	UART interface
ST7920 LCD	🖥️ Display	128x64 pixels
Buzzer	🔊 Alerts	Active buzzer

Optional Components 🔧

• 🔋 LiFePO4 AAA 80mAh (GPS backup)
• ⚡ TP5000 charging circuit
• 🔌 BMS with IN4007 diode
• 🛠️ Prototyping materials

🎯 Key Features Explained

• 🕒 Precise Timekeeping: GPS-synchronized time with battery backup
• 🌡️ Environmental Monitoring: Temperature and humidity tracking
• 📱 Smart Connectivity: WiFi enabled with web configuration
• 🔆 Adaptive Display: Auto-brightness with power saving

⚠️ Important Notice

❌ DO NOT USE AHT25 SENSOR!
Due to significant accuracy issues, we recommend using BME280/BMP280/TMP117 instead.

🔋 GPS Battery Modification

⚠️ Known Issue with GPS Module's Internal Battery

The NEO-6M GPS modules often come with problematic internal rechargeable batteries that:

• Are frequently dead on arrival
• Fail to hold charge properly
• Only last 15-20 minutes when disconnected
• Cannot be reliably recharged

🛠️ Solution Implemented

To resolve this, I've made the following modifications:

• Removed the internal battery and charging diode
• Installed a LiFePO4 battery (AAA size)
• Added TP5000 charging circuit for reliable charging
• Implemented BMS for deep discharge protection
• Added diode to drop voltage to 3V for GPS backup pin

💡 User Options

You have two choices:

1. Keep Original Battery:
   • Suitable if clock remains powered most of the time
   • No modifications needed
2. Modify Battery (Recommended):
   • Better for frequent power cycles
   • Eliminates 5-10 minute GPS lock delay on cold starts
   • More reliable long-term solution

📊 Schematics

👀 Circuit Diagram

ESP32 GPS Clock Circuit Diagram

📝 Format	High-resolution PNG
🔍 Zoom	Click image to enlarge
💾 Download	Full Resolution

📸 Gallery

Internal Components 🔧	PVC Case 🎨	Front View 📱
PCB Layout 🔌	Internal View 2 🔌

📜 License

GNU General Public License v3.0

✅ Permissions

• Commercial use
• Modification
• Distribution
• Patent use
• Private use

⚠️ Conditions

• License and copyright notice: Include the original license and copyright
• State changes: Document all modifications
• Disclose source: Make source code available
• Same license: Use the same license for derivatives

❌ Limitations

• No liability
• No warranty

🤝 Contributing

🍴 Fork

🔧 Code

📤 Push

📫 PR

📞 Support

If this project helps you, please consider:

⭐ Giving it a star
🐛 Reporting issues
💡 Suggesting improvements
🤝 Contributing code

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