Once upon a time, I synced a 200+ year old grandfather clock to a GPS 1PPS
output. It used a PIC to convert the 1PPS signal to a 24 pulse per minute (if
I remember correctly) signal to a model airplane servo. The servo just nudged
the (optically sensed) pendulum. It pretty much worked the first time. The
mods to the clock were done in such a way that no changes were made to the
clock or case.
I considered adding an auto-winder to it...
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