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

Take care when separating the HAT from the Pi.Pull evenly so that it detaches from all the pins at the same rate; do not pull one end of the connector off before the other! 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. 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.

The Raspberry Pi PoE+ HAT is an improved Power over Ethernet add-on board, compatible with any Raspberry Pi with PoE pins (including Raspberry Pi 3B+ and Raspberry Pi 4). 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?Do not expose the product to water or moisture, and do not place it on a conductive surface whilst it is in operation Tweaking the fan settings following the directions in my blog post Taking control of the Pi PoE HAT's overly-aggressive fan helps, though, because at low speeds, the new fan is actually a bit quieter than the old fan—32 dB on the PoE+ HAT, vs. 38 dB on the PoE HAT. Problems The Raspberry Pi 4 came along, and suddenly the board itself can pull over 7 watts at load. Combined with 6 watts of power for a hungry USB device or two, and we’ve exceeded the nominal 12.5 watt power budget. As a result, a handful of users that were trying to use the Pi 4 with POE were hitting power issues when powering something like dual SSD drives over USB. The obvious solution is to make the PoE HAT provide more power, but the original HAT was already at the limit of 802.3af PoE could provide, with a maximum power output of 12.95 watts. Before installing the PoE+ HAT, you must attach the supplied spacers in the four corners of the board

I was wondering why his Pi had that horrible sound, but mine didn't. Well, it turns out I just needed to plug in my hard drive. Then my Pi made the same sound. Dominic 10:01: And that has the fan. Yes. And so there’s been a lot of 3D work to make sure it all fits, and it’s all very compact, but you can now have a case with a built-in fan and a PoE solution, all nicely together. When getting PoE devices, be sure to take note of their PoE type as their power budget per device are different. PoE devices supply power according to the device IEEE 802.3 generation where the life-cycle generation is indicated by the extension: “af,” “at” or PoE+, and “bt” or “UPoE”. Here is the following power budget per device for each PoE type:

PoE allows you to mount devices in awkward or remote locations where it would be impractical to install power. We’ve tested a variety of pass-through headers and can recommend the 2×20 pin header from Pimoroni and the 4-way risers from RS and element14.

Does the HAT work with your Raspberry Pi? Every Raspberry Pi since 2014’s Raspberry Pi B+ features a 40 pin GPIO, and all HAT boards are designed for that. Raspberry Pi Zero W users may want to look for pHAT, smaller HATs designed for Zero form factor. If you are using a Raspberry Pi 400 then you will need a breakout board to access the GPIO. 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. Power over Ethernet is a widely adopted standard that places power on the Ethernet cable along with the data. It has no effect on the data, so you won’t lose bandwidth by using PoE. There are various standards of PoE; this HAT uses the most common standard 802.3af, which allows delivery of up to 15W. This means that the HAT is capable of providing all the power needed for running your Raspberry Pi. You will need power sourcing equipment to power your Pi. This is either provided by your network switch or with power injectors on an Ethernet cable.Or maybe 2.5W if voltage and/or current is peaking higher at times. The usual max for USB 2.0 is notionally 0.5A at 5V = 2.5W. At 5.08V just 0.493A would tip it past 2.5W which isn't far off what you measure. It would be worth seeing what happens if you can find a PSU which provides the same voltage on the Pi's 5V as the PoE HAT does, see how that compares, whether you get the same over-current failures. It’s embarrassing to have released a product with a bug like this, but it’s a lesson well-learned, and we will be improving our internal processes to prevent a recurrence. The solution Before installing the PoE HAT, you must attach the supplied spacers in the four corners of the board Power-sourcing equipment for an 802.3af Power over Ethernet network (such as a PoE Injector or PoE-compatible Router/Switch)

Some people asked if I could power the Pi via USB-C instead of over Ethernet while the HAT is attached. So I plugged in USB-C power with the HAT attached and... everything seemed to work just as well—at least, without any hard drives plugged in. Unlike other RPI, on a RPI4 the power LED is fully under the control of a GPIO expander, and when booting Raspbian resets this IO expander so causing the PWR LED to blink off on reboot. On booting the bootloader enables it again. But if the PWR LED goes off (blinks) at any other time it means have an unfit power supply/power cable. in short, the PWR LED should be always on except for a very short time just before a reboot happens.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. I planned to use one of them to pre-regulate a LiPoly charger IC’s input but somehow it ended up killing the charger IC after a few hours. An other one ended up drifting to 1.2V from the initially set 0.8V killing the device. The original PoE HAT implements the 802.3af standard, and can deliver a guaranteed minimum of 13W to the Raspberry Pi. This is enough to power a Raspberry Pi 4 at maximum load, but not quite enough to power the hungriest USB peripherals at the same time.