https://github.com/mdaskalov/esp32-dcf77-transmitter

DCF77 Transmitter for ESP32
https://github.com/mdaskalov/esp32-dcf77-transmitter

dcf77 esp32 platformio

Last synced: about 2 months ago
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DCF77 Transmitter for ESP32

• Host: GitHub
• URL: https://github.com/mdaskalov/esp32-dcf77-transmitter
• Owner: mdaskalov
• Created: 2024-01-06T19:26:20.000Z (about 1 year ago)
• Default Branch: main
• Last Pushed: 2024-02-11T13:56:38.000Z (12 months ago)
• Last Synced: 2024-10-27T23:42:09.128Z (3 months ago)
• Topics: dcf77, esp32, platformio
• Language: C++
• Homepage:
• Size: 25.4 KB
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## General 

Simulates the [DCF77](https://en.wikipedia.org/wiki/DCF77) time code signal on a GPIO pin. It uses PWM with frequency set to 77.5 kHz to simulate the carrier signal. The time is synchronized using NTP server.

## Installation

Configure your Wi-Fi credentials in the `defaults_override.ini` file. 

If missing, the file will be created on the initial build (see `override_copy.py`). 

By default generic ESP32 board (`esp32dev`) is used where only the `DCF77_GPIO` is configured. 

It is also possible to show the time and the transmitted data on an attached display using the `TFT_eSPI` library. 

Select one of the pre-configured environments in the `platformio.ini` or create one for your device.

## Antenna

Best results are achieved if you connect a ferrite antenna over 330 ohm resistor and a capactior to ground.

It also works with analog beeper or even with a led connected to the GPIO pin. 

Normally the clock gets syncrhonized in about two minutes depending on the distance and signal strength.