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<andy25225>
damex: it looks like it should work... i can't find a circuit diagram of it, but the documents imply that the gpio's are optional and just control some leds on the board
<andy25225>
and it uses the power pins on the gpio to deliver power to the pi
<andy25225>
it will also limit the ethernt line speed to a maximum of 100Mbit, so no Gigabit connection
<damex>
andy25225: are you sure it is 100mbit? there is no reason to get then :/
<andy25225>
might be more what you are looking for
<damex>
well, yeah, kinda - it is branded so better testing and more reliable then the most of the splitters available on market but it is really HUGE :(
<andy25225>
as far as i am aware the device you mentioned is the only "pi" compatible board
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<damex>
yeah. i guess it could be the only one
<damex>
i think it would be easier to power through 5v power supply over gpio pins or simply through usb-in/dc-in then getting large poe splitters
<andy25225>
if space is an issue then i expect that tplink module could be stripped out of it's case
<damex>
yeah, physical space is at premium. i am building portable/mini racks with arm boards and i thought that powering them by poe is a decent option (i don't see anything beside rpi4 to provide decent poe input and keep 1G). currently it is 4 boards with microUSB input + edgerouter X (poe in) + 5 port anker charger (physical size of one rpi-like board) with 4 port utilized. boards consume under 800ma peaking load on cpu.
<damex>
each board*
<damex>
andy25225: mounting it might become a huge problem. since it would be one poe splitter per board + extra cabling + mounting
<andy25225>
thats the trouble when looking at building small... often power supplies are forgotten in the equation.
<andy25225>
wht do you need it to be poe?
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<andy25225>
also... am i reading you correctly.... "(i don't see anything beside rpi4 to provide decent poe input and keep 1G)"... the rpi4 does not have native poe, it just has some pins to plug a poe adaptor in
<damex>
andy25225: i need it to be poe so i could swap switch with poe switch and get rid of extra cabling that i have now (microUSB cables)
<damex>
andy25225: on rpi4 poe hat does not increase height of the board that much and stacks on top.
<damex>
well, that is everything now is for a 'learning project' - i build it for homelab originally and now try to come with more mini racks that could be used for teaching distributed computing to juniors.
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<andy25225>
i see... so your just looking at options
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<damex>
andy25225: i am ready to get them asap though
<damex>
its like 'i need it now but we can survive using something else before i could distribute that mini racks'
<andy25225>
how many boards are you thinking of having in a rack?
<andy25225>
don't worry, i just re-read you message above
<andy25225>
4 boards, plus a switch..... if it were my project, i woundn't bother with using poe to power the rack.
<andy25225>
i'd go with some sort of black brick ac/dc adaptor that will out put 12v at about 5amps or a bit more. then a small dc/dc regulator for each board and switch
<andy25225>
poe is great for individual devices at the end of a line, or for if the board has poe built directly into it. but for the sake of a few extra cables (usb power) it just becomes more trouble than its worth.
<andy25225>
also, what if you decided a managed switch will be better, can you find one the does poe at a good price
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<[TheBug]>
um depending on how you do it you could simply attace 30mmx30mm 5v fans + heatsink on each board and then drive it from 5v gpio output..
<[TheBug]>
s/attace/attach
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<andy25225>
[TheBug]: there is that option..... but then you have 4 noisy little fans.... if you can get 12 (or5v to one larger fan one the rack, along with heatsinks on the boards... you have a quieter, more efficient cooling system
<[TheBug]>
noisy? You must h ave a poor fan supplier
<[TheBug]>
the rack fan will be 40x louder than using fans like that on the board directly, however, may actually provide better cooling -- so won't argue that part -- but 5v fans + heatsink is for sure doable in a reasonable sound envelope
<andy25225>
not loud.... i have a 80mm fan blowing over a rpi4.... keeps it very cool, and running at 5, is very quiet
<andy25225>
fan noise is generally all about speed control
<damex>
andy25225: managed switch would be much better options for sure. current edgerouter x (aka l3 switch) just provides 24v passive poe on one port and that's it (that is not something that could power sbc)
<[TheBug]>
I would veture a guess that it would still be louder than the 5v pi fans, they are about 18dBi or less that 80mm is probably at least in the 20s, liek 25-28dBi
<damex>
s/options/option/
<andy25225>
[TheBug]: i see you have quite a collection of devices... and various experiments of how to fix your fans
<[TheBug]>
;)
<[TheBug]>
andy25225: Did lots of dev for H3Droid (h3droid.com)
<[TheBug]>
so have many of the availabel H3 devices + more from just being a hobbiest
<[TheBug]>
lol
<[TheBug]>
was trying to count yesterday how many SBCs in this room and kept getting distracted
<[TheBug]>
at least 15 in sight line, with at least another 8 in boxes in my shelf
<[TheBug]>
damex: did you say you are a teacher?
<damex>
[TheBug]: just an engineer with enough seniority to teach new generation(s) :)
<[TheBug]>
ahh I see, though maybe you were a professor or grade school teacher hehe ;p
<[TheBug]>
just curious
<[TheBug]>
thought*
<andy25225>
[TheBug]: it's an Artic F8 running at 5v.... not sure what the dBi is... but the specs say it does 0.3 sone at 2000 rpm... whatever a sone is.... i did say i'm an expert in nothing
<andy25225>
like many things there are multiple different methods of cooling
<[TheBug]>
as I have one in one of my cases here I am familiar with it and yeah if you under volt it will be pretty quiet, I actually run the one I have with the Noctua 7v converter cable
<[TheBug]>
at 7v its still a little more audible than the 5v fans
<[TheBug]>
so at 5v may be equivlent
<[TheBug]>
I have one setup I made where I attached a 120mm 12v fan to 5v in case withj board and its pretty darn quiet also
<[TheBug]>
however, if your cooling 4+ boards, seemed like maybe 80mm at 5v wouldn't be enough air flow
<andy25225>
well i hope damex has plenty to ponder now.... power, cooling... size.... i wonder what he will decide on... in the mean time i must go find some food... i'm sure there is some in the cupboards
<[TheBug]>
:)
<[TheBug]>
yeah time for some coffee here
<Werner>
Excellent idea.
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