ESP32 Ethernet DCF77 Project

This project demonstrates basic Ethernet functionality on the ESP32 platform. It includes:

• DHCP configured
• Static IP configuration in commands
• Event handling for Ethernet and IP events
• UDP server example
• DCF77 time signal decoding
• NTP server functionality
• Tested with https://www.waveshare.com/esp32-p4-eth.htm
• DCF77-Modul https://www.pollin.de/p/dcf-empfangsmodul-dcf1-810054 A DCF77 time signal receiver module is connected to an ESP32-P4-ETH development board on a breadboard. The ESP32 board is powered via USB and has an Ethernet cable attached. The DCF77 module is wired with thin red wires and placed next to a cylindrical antenna. The setup rests on a printed instruction sheet with the heading DCF-Empfangsmodul DCF1 Best.Nr. 810 054 and a website link www.pollin.de. The sheet includes safety instructions in German, mentioning responsible handling in schools and separation from the power grid during installation. The environment is a casual workspace with a patterned tablecloth. The tone is technical and focused on electronics experimentation.
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Project Structure

• main/ – Main application code (Ethernet setup, event handlers)
• components/ – Custom components (e.g., ethernet_init, dcf77, ntp_server)
• build/ – Build output (ignored by git)
• sdkconfig – Project configuration

Getting Started

1. Install ESP-IDF
2. Configure your board and network settings in sdkconfig
3. Build and flash the project:

   idf.py build
   idf.py flash

4. Monitor output:

   idf.py monitor

Features

• Static IP assignment for Ethernet
• UDP server task (see udp_socket_server.c)
• DCF77 time decoding (see dcf77.c)
• NTP server example

Customization

• Adjust IP settings in main/ethernet_example_main.c
• Enable/disable features via sdkconfig

License

This project is in the Public Domain.