Re: Draws Hat with Cooling #case

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 Also, Amazon carries a variety of miniature screw assortments. Do a Google search for miniature screws. You might also look for eyeglass/watch screws.

Michael WA7SKG

Ryan W Leathers wrote on 11/3/19 4:41 AM:

Can you suggest a source for these tiny screws?
On Fri, Oct 4, 2019, 4:12 PM Frank Ivan via Groups.Io < <>> wrote:
Hello Everyone,
I have updated my case and it is 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
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
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 -
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
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.
Note: If you need RFI shielding line the inside of the case with
copper foil tape.
Enjoy and 73
Frank - K0FEI

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