Simulates the 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.
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.
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.