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The Raspberry Pi syncs with NTP Stratum 1 servers, which gives the system time an accuracy of about ±50ms. A second GPIO performs the required attenuation, and a few loops of wire are sufficient for an antenna which only needs to work over a few inches. The signal is AM, and transmits one bit/s, repeating every minute.
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Consequently, he decided to make his own tiny transmitter, which emulates the DCF77 signal and allows the watch to synchronise.Ī Raspberry Pi Zero W is the heart of the transmitter, and manages to coax it into generating 77500.003Hz on a GPIO pin – close enough to the 77.5kHz carrier that DCF77 uses. lives in a place where there is no reception of the DCF77 signal that his European wristwatch expects to receive.
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Or, at least, you can if there’s any signal. You can win any argument about the time when you have a radio controlled watch. With his clock now safely synced to an NTP server via the tiny radio station, can get back to work on his other projects, such as work-hardening copper wire for antennas with a Harley, or a nuclear apocalypse-Tweeting Geiger counter.Ĭontinue reading “Keeping Clocks On Time, The Swiss Way” → Posted in clock hacks Tagged atomic clock, Clocks, dcf77, ferrite antenna, longwave, MSF, ntp, raspberry pi, transmitter, wwvb But as points out, if the power is kept low enough, the emissions will only ever be received by nearby clocks. The pin is connected to a ferrite rod antenna, which of course means that the Pi is being turned into a radio transmitter and hence is probably violating the law. His solution was to provide a local version of DCF77 using a Raspberry Pi and code that sends modulated time signals to a GPIO pin. His IKEA clock is supposed to read signals from station DCF77 in Germany, but even the sensitive receivers in such clocks can be defeated by subterranean locales such as ’ shop. But really, having a clock that’s supposed to synchronize to one of the many longwave radio atomic clocks sprinkled around the globe and yet fails to do so is irksome to even the least chrono-obsessive personality. Could there be a worse fate for a guy with a Swiss accent than to be subjected to a clock that’s seconds or even – horrors! – minutes off the correct time? Indeed not, which is why went to great lengths to keep his IKEA radio-controlled clock on track.įor those who haven’t seen any of ’ YouTube videos, you’ll know that he pokes a bit of fun at Swiss stereotypes such as precision and punctuality.
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