Duet 3 with SBC and 5V fan
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Just started to build my new printer and the first question mark just came up
I connected a RPI4 to the Duet 3 and woule like to drive a 5V fan for cooling the RPI (because I have a spare Noctua lying around). Since theRPI GPIO pins are occupied by the ribbon cable I'm wondering where to get 5V for the fan. Is it possible to connect it to the Duet 3 Laser/VFD pins or is it a bad idea and I better should get another 12V fan for the SBC?
Thanks, Martin
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@MartinNYHC said in Duet 3 with SBC and 5V fan:
Is it possible to connect it to the Duet 3 Laser/VFD pins
It is possible for always on fan, for an always on fan you can use any 5v pin on any of the other connectors as well (being IO_n and DOTSTAR led connection) or you can combine the 5v pin with out1 to out9 negative pin to enable fan control.
Edit: I soldered my low noise always on fan to the 5v pin on the USB header (i.e. under the Pi PCB) as this can be turned off in software on the pi, but I haven't done temperature contol yet as it is so quiet. You could also cut a USB cable and connect the fan to the stripped wires there. Main motivation was to avoid adittional wiring between the Pi and the Duet as well as ensuring Pi has cooling if I for some reason only power on the Pi.
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Alright, just want to do it the right way. Also thought about soldering it to the RPI. I need to think about it. Let's see where it goes to....
Thanks!
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Fan Shim ? under the cable
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@Carlo said in Duet 3 with SBC and 5V fan:
Fan Shim ? under the cable
In general yes, but then my RPI case doesn't fit anymore because the height of the ribbon connector increases. My printer is currently running 24x7 and I just want to avoid printing the case again. Need to finish all the other printer parts.
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it also means no heat sinks so increased cooling need when idle?
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@bearer
I don't run mine with heat sinks had no issues with temps?
Only covers the cpu so heat sinks can be placed on the other chips -
You can always do what I did.
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@madmattco said in Duet 3 with SBC and 5V fan:
You can always do what I did.
product link would be handy for the uninitiated?
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@bearer
https://www.amazon.com/gp/product/B07R45W1LN this is the top board
https://www.amazon.com/gp/product/B07MCW4KCM this is the right angle pin adapter
And if you're interested, this is the nvme adapter im using
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@madmattco said in Duet 3 with SBC and 5V fan:
https://www.amazon.com/gp/product/B07MCW4KCM this is the right angle pin adapterthis one might be interesting for quite a few people here!
(was tempted to get one in order to de-jankify the PoE / Duet mix, but realized it won't fly without extending the 4 PoE pins as well. will have a think, or ask jlcpcb to send something similar:)) -
I am using one of these to power it all.
https://www.amazon.com/gp/product/B07ZQB6S3L
5v feed to the duet3 is also disabled
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For what it’s worth the DOSTAR LED connection works to give 5V as someone else already mentioned. I use that to power a pi touch screen.
