> How about a clock with wooden gears I've made some from pohutakawa https://www.flickr.com/photos/97814409@N04/albums/72157644882823968 It's a rock-hard wood and not something I'd care to repeat on a regular=20 basis I've drawn up some 3D files for just the teeth and plan to put those around a wooden hub, which isn't nearly so much work > and a solenoid to clunk the escapement instead of a pendulum. The > gears would all be visible through cutouts in the case ... Those gears are going to be moved by a solenoid (of sorts) but not in the way you probably think > That could be controlled by a PIC that listens to one of the 60kHz > time frequencies GPS modules are ridiculously cheap too. > with a magnet in the ends of the hands and a hall effect device at the > 12 o'clock position you would know every hour what time it is displaying. > Then it could pulse the solenoid fast to go to summer time or just stop > for an hour to go back to standard time. All of the clocks I've seen in the craft market are simply relocated quartz movements in an "arty" setting. Which is fine enough, if simple to do The long case clock I'm planning https://www.flickr.com/photos/97814409@N04/albums/72157644973110900 will have as many smarts as I can jam in there, including length adjustment to synchronise with mains. Probably not possible to advance a pendulum clock for daylight saving via the pendulum but a small motor on the gears should do it Joe=20 ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2016.0.7752 / Virus Database: 4647/12880 - Release Date: 08/25/16 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .