SBC Cooling
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Was looking around for options to cool my SBC and ran across this and thought I'd share. https://www.argon40.com/argon-fan-hat-for-raspberry-pi-4-raspberry-pi-3b-and-raspberry-pi-3-b.html
Having a hard time tracking down what pins are full pass through and what are not. but I'll find out when I get it Saturday. Even if it doesn't work out with the Duet ribbon cable, its a cool template for a DIY project where you can pick pins not in use and pass the rest on to your Duet.
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Well never mind looks like its using pin24. Damn. I guess they felt the most of the PI community wasn't going to be using SPI so they picked that one... maybe I can rewire it...
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That’s not a cooler.
THIS is a cooler
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I was pretty disappointed by the argon case as well. I repurposed for another use that didn't need the expansion header. Let us know if you end up able to bypass it.
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Found another option: Ice Box RPIFan V1.0 I was worried it would be a loud fan but its very quiet. See how long it lasts... All header pins are pass through and remain male so the 26pin ribbon goes right on...
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@nurgelrot Nope. Don't use this one either It cools the board but causes it to drop below 4.6V from time to time... Who would think it so hard to find active cooling that works. Guess I'll wire a Noctua 40mm 5v right of my 5v PSU. Was hoping to not have to do that but since no one can make simple fan that doesn't block the header or screw up the voltage...
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@nurgelrot, I have started to put a POE board on my pi4's that has a built-in temperature controlled fan and it has worked out nicely.
The biggest problem with pi's in general is the extremely thin gauge power wire that is used. In any pi install that requires a bit more power, if I am not running POE, I hard wire a power jack to the board and use standard AC adapters with a DC jack to power the pi. These AC adapters usually have a much beefier 5V output wire and are not subject to the brown outs you get with the pi power connector.
I have also been known to use a 12V supply and a small buck converter immediately in front of the pi to eliminate the voltage drop in the power cord. -
@jens55 Yeah I'm using a MeanWell LRS-100-5 its a 5V/18A supply I'm sure the pi is get more than enough power running without the fan board. Just whatever that fan hat is doing it making the pi report a drop in voltage. It's odd cuz I have the 5v supply running to the USB C port (power only) so I don't know what that fan board is doing. But its definitely the cause so off it comes.
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@nurgelrot I should add that I wired the loom as well and it using 22AWG wire. Been awhile since I figured out voltage drops in wiring but it should carry 5V more than the meter or so away the PS is sitting.
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@nurgelrot, the commercial wall warts for the pi use something like 28 to 32 gauge. I was quite surprised when I worked out the voltage drop for the usually short cable that goes from the wall wart to the pi power connector. I would think that 22 ga is just fine but that's only a guess (remember that you need twice the distance of power supply to pi for the wire run)
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@jens55 on a whim I touched up the solder on the 5v and ground pins on the fan board. Have it running on another pi that's running 2 web cams + a small display and hasn't had an issue yet. I'll test for a couple days. Maybe it was just bad manufacturing.
