they do contain strong magnets which are, IMO, worth salvaging.
2 karma · joined October 23, 2017
An even earlier version used an atmega and was powered from batteries [3]
Those slave-clocks are pretty loud. Both versions have a way to pause the clock.
https://gitlab.com/close2/nebenuhr https://gitlab.com/close2/nebenuhr_hardware https://github.com/close2/nebenuhr