Facelesstech made this simple purple PCB for attaching a USB fan to a baseball cap with the aid of a money clip that slips through the two openings in the PCB. So simple! The circuit is intended for putting a USB fan in front of your face but the money clip attachment could be modified for lots of other purposes.
So have you ever been sick of holding your little pocket-sized fan on a hot day, Or have you had your hands full and not been about to point the fan at the right angle, Then boy have I got something for you.
This idea came to me while I was on holiday and immediately started brainstorming an idea. It took me longer then I thought It would to come up with a way so mount a fan to my hat. I started with one of these 90 degree USB fans that are really cheap. At first I was going to have a 2 part PCB and solder them together at right angles but after A little more thought I came up with the idea I have now.
I had a few must have with this project.
It should be able to be attached to a hat without modifying the hat in any way
It had to use off the shelf parts so its easy for people to reproduce