Linetime

Measuring mains AC frequency with GPS

December 2016

Status: Revision 1 worked, pending revision 2

linetime PCB

“fun” fact: on the 31st I saw 4320013 cycles on the (UK) national grid, over 86401 secs - enough to compensate mains-based clocks…
— Adam Greig (@adamgreig) January 2, 2017

(hardware is GPS timebase plus fast comparators bla bla high speed timers etc) pic.twitter.com/rjOTvbySEC
— Adam Greig (@adamgreig) January 2, 2017