https://github.com/mdaskalov/dcf77-clock-sync

Emulate DCF77 time signal on Flipper Zero using the RFID antenna and the A4 GPIO pin
https://github.com/mdaskalov/dcf77-clock-sync

Last synced: 2 months ago
JSON representation

Emulate DCF77 time signal on Flipper Zero using the RFID antenna and the A4 GPIO pin

• Host: GitHub
• URL: https://github.com/mdaskalov/dcf77-clock-sync
• Owner: mdaskalov
• License: mit
• Created: 2024-03-02T17:16:58.000Z (10 months ago)
• Default Branch: main
• Last Pushed: 2024-03-16T13:38:12.000Z (10 months ago)
• Last Synced: 2024-05-02T01:57:43.425Z (8 months ago)
• Language: C
• Size: 26.4 KB
• Stars: 7
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# Flipper-Zero DCF77 Clock Sync

Emulates the [DCF77](https://en.wikipedia.org/wiki/DCF77) time signal on the RFID antenna and on GPIO A4 pin.

Uses PWM with frequency of 77.5 kHz on the GPIO pin to simulate the signal.

# Usage

Normally the clock gets syncrhonized in two to five minutes depending on the signal strength.

The OK button changes the transmitted signal between CET and CEST (dst) time.

# Antenna

The RFID antenna wokrs best at distances of up to 50cm. The signal gets recognized in few seconds.

When using the GPIO, 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 small in-ear headphone connected to the GPIO pin.