What would happen if I accidentally connected a fans ground input to the 5v output of the Raspberry Pi?
Does it destroy the fan?
If the fan's ground is not connected to anything else, and the fan's 5V is connected only to 5V (or nothing), then no harm done.
The GPIO 5v on the Pi was connected to the "Ground" on the Fan - and the GPIO ground on the Pi was connected to the 5v input on the fan. No harm has been done to the Pi. But can the same be said the other way around? - There has been no visible signs.davidcoton wrote: ↑Mon Sep 09, 2019 10:35 pmIf the fan's ground is not connected to anything else, and the fan's 5V is connected only to 5V (or nothing), then no harm done.
If you short the 5V output, depending on the Pi model, you may damage the Pi. It may be temporary or permanent damage.
There are many other possibilities, ranging from "No Harm" to "Burn Your House Down" (somewhat unlikely unless something else is seriously wrong). Take care, three times
a dayper fan connection.
I use an old, stripped usb cable for this task myself.