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

Product Information

Before installing the PoE+ HAT, you must attach the supplied spacers in the four corners of the board 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 information Dominic 4:00: Yes, yep. So that’s why there are four pins. So each pair ends up with a pin. And because of crossover cables, you end up with each pin could be positive or negative. Officially, it should only be in pairs, but if things go wrong, it could be anywhere. So there’s a very fancy bridge rectifier at the front. It’s an active bridge we use — Eben 5:28: Cool. Okay, so that’s PoE HATs, what they do. Are there any other — so let’s talk a little bit about the evolution from PoE HAT, to PoE+ HAT, to PoE+ HAT for Raspberry Pi 5: what were the technologies that were introduced in each of these — cause this isn’t just a mechanical thing, right? There’s also some new technology in this design. And there was some new technology in the PoE+ HAT originally. So what’s been introduced at each stage?

I am using passive PoE injector, should be compatible with 802.3 af. It powers other two devices in my network without issues, one being older rasberry pi with external PoE splitter.Dominic 1:10: I can’t say if that’s James’s plan or not. But that appears to be the starting point. I was thinking; the LAN9512 and LAN9514 don't use 5V so it's likely the LAN9515 on the 3B+ doesn't either. That means it's either over-currenting on its 3V3 ( which seems unlikely ), or it's getting an over-current signal from elsewhere, presumably whatever is switching, providing or regulating the 5V to USB devices. Did you know that a banana can be an instrument? A watermelon can be a controller for a game? This and lots more is made possible using the Adafruit Capacitive Touch HAT. For use with all 40pin GPIO Pi, this HAT has 12 crocodile clip connectors which can be connected to objects that are conductive. Furthermore, PoE can be easily moved around and reconnected. It is like plug and play where an entire network doesn’t have to be dismantled if you wish to move it around. May I know if this high temperature is expected? I have concern since I intend to deploy my Rpi for long term running in a non-airconditioned room.

The USB ports on the Pis only supply 1.2 amps. This is annoying, but isn’t a weakness of the PoE HAT at all. We can hope for a future Pi revision that raises that limit. Until then, the workaround of tapping power directly from the 5v rail works nicely. For this product to be used, the network it is connected to needs to have power-sourcing equipment installed. I’ve just bought 5 of them to replace the older v2 where the fans are noisy and for the extra power.Dominic 3:18: Through the switch. Yes. And then it applies a voltage to the cable, to then try and detect a resistor of a particular value. And if it can detect that, then it knows which power range available. There are more advanced methods for the higher, for PoE++ that we were referring to, but we don’t do that, so no need to describe how all that magic works. 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: But I tried running the test a few more times, and every time, the Pi would reset after a few seconds at full blast.

Our 5V USB output, denoted VBUS, is fed by the main 5V rail via a current-limiting switch. This switch is designed to protect the system by detecting short-circuit, over-current, or reverse-voltage events, and disconnecting the USB ports in response. Our current-limiting switch is set to a limit of just over 1A.Dominic 7:59: It’s probably eight, ten layers PCB. And what we’ve done now for the latest one is taken that, instead of having a separate PCB, we’ve now got one PCB, which then has the ferrite clamped on. And so that one PCB has the 40-pin connector on it, it has the four-pins power connector, and then also has the turns built in — Only power with PoE HAT works fine, RPI is working fine (no sudden restarts or anything like that), just eth0 link does not work. our board does not have any EPROM id because we want everybody to put their proper HATs on top of our shield There is no startup current limiting, it almost acts like a direct short from Vin to Vout at startup. Some even overshoots the target voltage by a considerable amount. Nothing wrong with what you have done, and I'm not criticising, just trying to get a feel for how closely what you measure may be with reality.