This is a GPS driven LED display desk clock. It is configurable (with buttons on the back) for almost any timezone (half-hour timezones are not supported) worldwide as well as for daylight savings time rules for the U.S., E.U., Australia or New Zealand (or DST off). The clock can display 24 hour time (00-23 hours) or 12 hour time with AM/PM LEDs. The display has colons between the two-digit groups for hour, minute and second that can be on, off or blinking at 1/2 Hz. The display brightness can also be adjusted (to any of 4 steps). The display consists of hour, minute and seconds as .56" red seven segment LEDs, and a .3" tenth-of-a-second digit. The display is multiplexed with a refresh rate of approximately 600 kHz. The accuracy of the display is within 200 µs of GPS time. Those two factors make it suitable for such things as time-stamping slow motion video. The board has a super-capacitor mounted on it to provide power to retain the satellite almanac for up to around 3/4 of an hour without power (this allows the clock to retain the correct leap-second count, among other things).
It (optionally) comes with (or in) a laser-cut wood and acrylic case and with an AC power supply (90-240 VAC, 50/60 Hz, North American plug). A GPS antenna is required and an active magnetic-mount "puck" antenna is optionally available. The GPS antenna connector is SMA and supplies 5 VDC power (there's a jumper on the board to change this to 3.3V if desired) for active antennas (up to 100 mA).
It is available either fully assembled and tested or as a "quick kit," with or without the case and power supply (5 VDC @ 250 mA, 2.1mm barrel connector, center positive). The "quick kit" means that all of the surface mount components are installed and programmed, leaving you to install the through-hole parts and assemble the case (if applicable).
This is absolutely the most accurate human-readable clock for the price that I know how to make. It's a handsome and functional conversation piece for anyone interested in time.
Richard | Nov. 30, 2017
James | June 1, 2017
David | May 22, 2017
Lars | Feb. 23, 2017
Thomas | Feb. 6, 2017
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I design and build small, useful electronic things. I started in 2013 after leasing an electric car and deciding that I could build my own charging station. Since then, I've gone on to design lots of things to fill particular needs.
The name of my store is partly a nod to Arduino's Italian roots, since Arduino got me into microcontroller engineering, and that led to everything else. I also like the image of Geppetto, working away in his workshop making little things that come to life.