Power Your Pi with an ATX PSU using this HAT | #piday
If you’re a scavenger (like me) of 20- or 24-pin ATX PSUs you might be intrigued by this Pi HAT from Hackaday.io user [tomtibbetts] that powers the Pi and plenty of other projects, provides controlled shutdown and reboot, has +5 and +12 VDC breakout terminals, and even a wee prototyping area for novel designs. Very cool! Read more and take a look at the schematics and other files here at Hackaday.io.
The PiRyte Mini ATX PSU allows you to power your Raspberry Pi and project boards using an inexpensive desktop power supply. Additionally, it enforces a controlled shutdown so that the Pi’s operating system can properly close down without corrupting disk files.
Specifications:
Uses inexpensive off the shelf ATX desktop supply. Works with both 20 pin and 24 pin connectors.
Enables operating system to perform controlled shutdown and reboots to minimize disk file corruption.
Back powers the Raspberry Pi with dedicated 5 VDC line.
Screw terminals break out +12 VDC and +5 VDC for user projects.
Provides a prototyping area with access to +12 VDC, -12 VDC, +5 VDC, +3.3 VDC, and Ground
Conforms to the Raspberry Pi Foundation’s HAT footprint.
40 Pin GPIO stacking header allows use of other HAT conforming boards.
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Why not tie all of the supply rail pins on the ATX together? That way a bad connection or cable crimp on one pin won’t make it not work and there is less current/temp rise on any one pin.
Since you use pin 21 for the PI +5, I think an old 20 pin ATX supply won’t work with this board.
I’ve run into cheap ATX supplies in the past that will not come up without some minimum load on the +12V (or sometimes +5). Easy work around is to connect a +12V auto bulb to provide a load.
Why not tie all of the supply rail pins on the ATX together? That way a bad connection or cable crimp on one pin won’t make it not work and there is less current/temp rise on any one pin.
Since you use pin 21 for the PI +5, I think an old 20 pin ATX supply won’t work with this board.
There’s not any logic for backpower protection. See https://github.com/raspberrypi/hats/blob/master/designguide.md for what’s recommended.
I’ve run into cheap ATX supplies in the past that will not come up without some minimum load on the +12V (or sometimes +5). Easy work around is to connect a +12V auto bulb to provide a load.