UCTRONICS PoE HAT for Raspberry Pi 4, Mini Power Over Ethernet Expansion Board for Raspberry Pi 4 B 3 B+, with Cooling Fan

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There is one other avenue I'd like to explore. Maybe they're not actually dead. I've tried removing the PoE HAT and powering both of the RPI4s with the official RPI USB-C AC adapter I have. And they both now do the same thing. The little red light blinks a steady blink at about a 1 second interval seemingly forever. I counted off at least 30 blinks that seemed to be exactly 1 second apart from the moment I connected power. I'm not 100% sure what this blink pattern means. I'm kinda confused by the descriptions I'm finding about the blink codes that the RPI4 produces. To help you choose, we’ve listed the best Raspberry Pi HATs that we have personally tested, grouped by their use case. These expansion boards can be used for everything from general learning to implementing A.I. via Machine Learning. Or you could just build your own Raspberry Pi powered robot to explore the world around us. Before installing the PoE+ HAT, you must attach the supplied spacers in the four corners of the board Dominic 0:48: Well, Pi 5 introduces a lot of new things, and one of the things, to make board space in the right area, was the PoE connector — the little four-pin connector — got moved to the other edge of the board.

The official specs don’t tell the full story, evidenced by the initial announcement that claimed 5 amps instead of 4. That discrepancy bugged me enough, I reached out to the man himself, CEO [Eben Upton]. The head honcho confirmed: The fan position on the new PoE+ HAT has changed so now the ventilation slots in the new Uputronics GPS HAT for example obscure the fan. May be an issue with other HATS? I have some issues that I would like to share with you if I may. There could be some user error here but hopefully if there is you can point that out! :) The power issues were solved for the Pi 3 B+, but after the Pi 4 came out, people started plugging in more power-hungry devices like USB 3 SSDs, and the Pi's internals could draw even more power. This exposed a flaw can hit some users: the PoE HAT just can't put through all the power a fully-loaded Pi 4 needs.With the HAT mounted, I first tested the fan; the old HAT was a little annoying (but not too obtrusive) when it's fan was going full blast. Well, I compared the new ADDA fan (2.4 CFM at 12k RPM) to the old Sunon fan (2.2 CFM at 10k RPM), and here are the results: HAT 🎩 Dominic 2:00: That is indeed extra taps on the primary windings. So this is non-isolated volts direct from the cable through the transformer — well not through the transformer, but it’s this tap on the transformer. And then those four pins go up to the PoE HAT, which then gives us the isolation required to generate then the 5V to power the Pi 5. My hunch is that it is unlikely to be your choice of Operating System that is doing the damage. But on the off-chance that it is, a forum run by Canonical - the developers and maintainers of Ubuntu - would be more appropriate. https://ubuntuforums.org/ The Raspberry Pi PoE+ HAT's overall dimensions are 56.5mm x 65mm (identical to the original PoE HAT). Eben 7:25: I remember the first time I saw one of those: I mean, it’s such a beautiful little space-age solid-state bit of stuff, right? It really does look beautiful.

Unfortunately the reduced schematics don't show the LAN9515 and the datasheet for that is not publicly available so only RPT could answer technical questions on its spec, how it's wired or configured.PoE delivery intelligent where it is designed to protect network equipment from overload, underpowering or incorrect installation. Ok, I think I remember seeing that bit now. I can be sure these RPI4s are dead then. Thanks for helping me find that.

Eben 9:17: Right. So it was a sort of bonus feature of the PoE HAT, was it also had a thermal solution for the CPU. When you fit the supplied screws for the spacers the Pi4 no longer fits into the official RPi case as they impact the locating posts! Possibly the same on other cases? Separate switch and injector are way more expensive. The TP-Link injector linked above is not even 802.3af but a kind of PoE-like poor man solution and still ends up costing more.And if it is the third-party PoE hardware you are using: similarly, it seems to be something you should take up with your hardware supplier. (In common with all prior models of RPi board an RPi4 does not need a fan for its own protection. So having a fan that does not perform as you expect should not of itself be fatal.) Extensive testing over all configurations, operating parameters, and use cases is the only way to minimise the likelihood of releasing a product with a hardware issue. Even relatively simple hardware can end up catching you out by throwing up some unexpected bug or issue. And even the big guys with huge development teams and test labs occasionally mess things up — anyone remember the Pentium FDIV bug? Now, before you get all excited, you have to make sure you have a PoE+ switch or injector. A lot of cheaper and older PoE devices only support the older af standard, so you'd still only get 13W. PoE+ Switch Eben 6:07: When I think about transformers, I think about a sort of a ferrite core with some windings —

The current global semiconductor shortage — which you’ll almost certainly have read about by now — is constraining our supply of the original PoE HAT. In general, we’re weathering the shortage very well, and the supply of mainline Raspberry Pi computers, Zeros and our other products have not been affected (we’re very good at pipelining). Unfortunately, the first-gen PoE HAT uses silicon that’s in short supply. Dominic 1:39: Aha! That takes the volts from the PoE — from your Ethernet cable, so it’s around 48V, and brings it out to those pins there then for the PoE HAT to take that, and convert it to the 5V, right? I repeated the experiment with the original PoE HAT, and you can review my raw results if you’d like. There are a couple minor caveats, mostly related to temperature measurement. My IR Thermometer doesn’t provide the rich data that a full IR camera does. Additionally, I was limited to measuring just one side of the PoE boards. I believe that the hottest spots on the original PoE HAT are on the underside of the board, while on the new HAT, seem to be on the side facing away from the Pi — that’s a win in itself. All that to say, my temperature measurements of the original HAT are probably quite a bit too low. More Launch Problems? Eben 8:21: So we’ve built, rather than buying a transformer from somebody else, we’ve actually built our own transformer on our own PCB, and we just put a ferrite around it. Do not handle the PoE+ HAT while it is powered, to avoid risk of injury from exposure to potential high voltages. Avoid handling the Raspberry Pi while it is connected to a power outlet; only handle by the edges to minimise the risk of electrostatic discharge damage. Additional informationEben 10:29: So we now have efficiency across the power consumption range, rather than concentrating that efficiency up at the top.