If the power handling of the resistor is a problem, remember that four 1 watt resistors each of resistance R ohms can be wired to give you one 4 watt resistance of R ohms. Wouldn't that have to be N resistors in parallel of N*R resistance to get R resistance with N wattage? So 4x 40Ω or 10x 100Ω to...

It is worth looking a how the commercial UPS solutions work. AFAICT they mainly package everything on a HAT, but still use the microUSB to connect power (main and reserve) to the Pi. The ones that I've seen (admittedly not a large selection) all seem to involve a power passthrough setup. ie You plu...

My understanding of the two PP tabs I plan to use is that they're before all of the power protection stuff, which shouldn't be allowed to receive any back-fed power (at least I'm hoping power won't feed backwards through Q3 or U14). So unless the circuit diagrams are wrong (or I'm just not reading t...

This is my first post so I'm not exactly sure where this should go. There's no dedicated hardware section and this doesn't really feel like a beginner thing, so I'm hoping this is the right place. I've recently acquired a RPi 2B. A little old, but it does the job. I'm trying to implement a very, ver...