Macrofab Engineering Podcast

MEP EP#237: Ice Cream Solder Paste EquipotentialParker Cat Feeder Unreminder Started designing the parts and symbols in Eagle. Will post more on twitter as I build the components and put together the symbols Garage Door opener hacking Converting my normal style garage door opener to a “jackshaft” style opener Why? LiftMaster, Chamberlain, Craftsmen are all the same Mine is a Liftmaster Formula 1 Belt drive need to convert to chain drive to attach to the jackshaft All of these use similar drive mechs Other things that are needed Garage door auto lock SureLock Garage Door DeadBolt Cable tension switch LiftMaster 41A6104 Stephen High voltage low current measurement Resistive dividers? Caddock 1776-C681 10M ohm 0.1% tolerance with 0.05% matching Low PPM This method is ok but requires a rather large current sense resistor which is not great. Floating supplies This is how multimeters work. The reference is floating. Isolation solution May go with a