Draws Hat with Cooling #case
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Michael WA7SKG <wa7skg@...>
Some hardware stores (typically, NOT Lowes or Home Depot). In our area (PNW), Coastal Farm & Ranch carries down to M2.0. Also look for RC hobby stores. They often carry down to M1.0 for model airplanes, possibly even smaller than that. If you prefer online, try microfasteners.com. Also, Amazon carries a variety of miniature screw assortments. Do a Google search for miniature screws. You might also look for eyeglass/watch screws.
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Michael WA7SKG Ryan W Leathers wrote on 11/3/19 4:41 AM:
Can you suggest a source for these tiny screws?
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Ryan W Leathers
Can you suggest a source for these tiny screws?
On Fri, Oct 4, 2019, 4:12 PM Frank Ivan via Groups.Io <k0fei=me.com@groups.io> wrote: Hello Everyone,
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Very nice. I am trying to power my Pi3/DRAWS today for the first time. This case/fan/PoE solution is really nice.
Clifford - KK6QMS
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Frank Ivan
Hello Everyone,
I have updated my case and it is Thing 3897403 https://www.thingiverse.com/thing:3897403. It uses a Raspberry Pi Poe Hat between the Raspberry Pi and the Draws Hat. This brings a temperature controlled fan blowing on the Pi's CPU and also is sealed so that hot air can't recirculate back through the fan but must exit through the cooling slots. Again - can be printed for Pi3 or Pi4. Case for Raspberry Pi 3b or Raspberry Pi 4b + NWDR DRAWS hat with GPS port on side. Added PoE Hat as temperature controlled fan - keep Pi cool no matter load SCAD file provided so you can help tune the design STL files for both Raspberry Pi 3b or Raspberry Pi 4b print your choice Has a powerpole power port Nice fit for DRAWS card Rounded corners Machine screws into card spacers hold case together
Hardware 4 M2.5 x 8mm hex socket head machine screws (8mm does not include head) 4 M2.5 x 15mm female to female spacers 4 M2.5 x 8mm male to female spacers 4 M2.5 x 25mm hex socket head machine screws 1 Adafruit ADA2223 - 8.5mm header 40 pin stacking header - also available on Amazon 1 4 Pin Extra Tall Header - https://thepihut.com/products/4-pin-extra-tall-header-push-fit-version-poe-hat
1 Official Raspberry Pi Power over Ethernet card - must be official Raspberry Pi PoE hat Available on Amazon - but PiHut is cheaper and you may want to get 4 pin header from PiHut
Assembly Clean out screw holes - 7/64 or 3mm bit does it nicely Clean out ports Install Powerpole connector - maybe use a bit of thin double stick tape to hold in place Install DRAWS card in lid. It's a close fit but should not be difficult Push M2.5 x 25mm screws into holes Slide baffles into slots - keep fan power notch on right as you look from back to front of lid Install 8mm spaces on screws coming though Draws card Install 40 pin spacer header into PoE Hat with header pushing into header on PoE Hat Install PoE Hat onto Draws card - you may need to work the hat past the baffles Install 15mm spaces onto screws coming through PoE Hat Plug Pi into Poe Hat - make sure it is aligned with the pins go into correct holes Install base Secure with the 4 M2.5 x 8mm screws Tighten every thing up with allen wrench
The PoE Hat will keep a Ri4 down to under 60C under extended load. It easily passes the heating test from the Explaingcomputers YouTube videos testing Raspberry Pi4 B cooling. While the PoE Hat is primarily used as a cooling fat, but a nice side effect is you can power the system from the ethernet port.
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