Published: Aug. 12, 2020, 10:11 p.m.
Parker
- 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
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 an isolated solution - basically a power supply that isolates the secondary.
- Isolated digital communication down to LV side.
- Tests for pcb shielding
- Did a shield plane test on a new pcb assembly.
- Top and bottom pours that respect clearance rules.
- 5mm pitch via stitching.
- All terminate to one pin on a 2 pin header.
- Second pin connects to a plated bolt hole that goes to chassis.
