https://github.com/m7i-org/flipper_longwave_clock
Decode or demonstrate long wave time signals with your flipper zero .
https://github.com/m7i-org/flipper_longwave_clock
Last synced: about 1 month ago
JSON representation
Decode or demonstrate long wave time signals with your flipper zero .
- Host: GitHub
- URL: https://github.com/m7i-org/flipper_longwave_clock
- Owner: m7i-org
- License: agpl-3.0
- Created: 2025-02-02T22:22:58.000Z (over 1 year ago)
- Default Branch: main
- Last Pushed: 2025-02-03T11:21:14.000Z (over 1 year ago)
- Last Synced: 2025-02-03T12:27:24.355Z (over 1 year ago)
- Language: C
- Size: 43.9 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 1
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Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- License: LICENSE
Awesome Lists containing this project
- flipper-zero-awesome - Longwave Clock - org](https://github.com/m7i-org) | ⭐ 22 | [Official](https://lab.flipper.net/apps/longwave_clock) / [GitHub](https://github.com/m7i-org/flipper_longwave_clock) | (GPIO)
README
# Longwave Clock
This is a Flipper Zero app to receive and decode, or simulate, multiple time signal broadcasts with different protocols and time formats. For receiving via GPIO, an inexpensive receiver connected to a receiving pin is required.
## Protocol support
### DCF77 (Europe, Germany)
  
[DCF77](https://en.wikipedia.org/wiki/DCF77) is broadcasted from Frankfurt am Main in Germany ([50.0155,9.0108](https://www.openstreetmap.org/?mlat=50.0155&mlon=9.0108#map=4/50.01/9.01)) and requires an antenna tuned to 77.5 kHz.
- The radio transmission can be received all over Europe (~2000 km from the sender).
- 1 bit per second is transmitted by reducing carrier power at the beginning of every second.
- The transmission encodes time, date as well as catastrophe and weather information (encrypted, not decoded).
### MSF (Europe, United Kingdom)
  
[MSF (Time from NPL/Rugby clock)](https://en.wikipedia.org/wiki/Time_from_NPL_(MSF)) is broadcasted from Anthorn in the UK ([54.9116,-3.2785](https://www.openstreetmap.org/?mlat=54.9116&mlon=-3.2785#map=5/54.91/-3.27)) and requires an antenna tuned to 60 kHz (as does [WWVB](#wwvb-north-america-us)).
- The radio transmission can be received over most of western and northern Europe.
- The transmission encodes time, date as well as DUT1 bits (difference between atomic and astronomical time).
- The app only supports the slow code at 120 bits per minute, of which only 60bits are encoded.
- Same frequency as WWVB - in Europe you will receive this signal through a WWVB receiver.
### WWVB (North America, US)
[WWVB](https://en.wikipedia.org/wiki/WWVB) transmits on 60 kHz and is on the backlog for the Longwave app.
If you're based in the US and would like to help: PRs are welcome!
## GPIO modules
The app supports a demonstration mode as well as GPIO mode. For GPIO mode, external modules are required.
In GPIO mode the following configuration is available (per protocol):
- GPIO data: use "inverted" if the module outputs logic high to the data pin when the sender signal is low (hopefully rare).
- Data pin: this configures the receiving pin on the flipper, C0 is the default and recommended pin.
### Supported modules
The following shows modules that I own and have been successfully tested for reception.
#### 77.5 kHz module (DCF77)
You can find this type of module by searching for "DCF77 module" in any electronics online shop.
#### 60.0 kHz module (MSF, WWVB)
Search for "WWVB module" in any electronics online shop.
This applies even if you want to receive MSF instead: they use the same frequency.
### Pinout
The modules I checked are pretty much the same, here is the common pinout configuration I found and tested.
Please check with the manufacturer, as yours might be different and you may cause damage by wiring the module incorrectly.
- **VDD**: flipper pin 9 (3V3)
- **GND** / unlabeled: flipper pin 11 (GND)
- **PON** / **P**: power on, asks for "logic low", using flipper pin 11 (GND)
- **OUT** / **T**: the data signal, using flipper pin 16 (C0)
## Picture credits
- The [Font “HaxrCorp 4089”](https://fontstruct.com/fontstructions/show/192981) by “sahwar” is licensed under a CC-BY-SA license.
- The picture of a flipper zero is (C) [Flipper Devices Inc](https://flipperzero.one/).