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by stephen-mw
2853 days ago
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I just built one of these. It's fun to have a little computer that can synchronize highly accurate time without an internet connection by listening to things in outer space! I built an auto-install script that anyone here is welcome to use or reference[1]. If you know what you're doing, just change the GPIO pin to your PPS input and fire away. Unlike the author I used Chrony instead of NTP. It's lighter-weight and much easier to configure with a PPS/GPS reference clock. The GPS chip I used was an ATGM336H, which can be had for less than $8 on ebay. I'm able to lock consistently 11 satellites from my desk[2] Keep in mind the Pi has no hw RTC. If you're doing this for fun spend a few more bucks and buy an rtc chip from ebay so you don't drift considerably between being powered off. 1. https://github.com/stephen-mw/raspberrypi/blob/master/roles/... 2. https://www.ebay.com/sch/i.html?_from=R40&_nkw=ATGM336H&_sac... |
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