In case it comes up, yes, I have my PoE switch (Meraki MS220-24P) plugged into a UPS, but my comment above is about having an option to have PoE-powered Pis (ideally a hat, not a 3rd party splitter) also have onboard device-local UPS to keep the Pi running for 30 minutes or so until PoE is restored. The new fan, which is from a different manufacturer and outputs 0.2 CFM more air at max speed (12,000 rpm). The new fan is almost identical to the fan used in the Pi Case Fan kit, so I'm guessing the switch could be optimization of the supply change, or just related to parts availability. This is, once again, a machine transcription that has been edited by a human; if you spot anything that’s obviously off, drop us a note in the comments. 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. Eben 10:15: That’s very neat! Good. And how much more efficient is it than the previous design? Is it more efficient than the PoE+ design? Or is it —

Avoid handling the Raspberry Pi while it is connected to a power outlet; only handle by the edges to minimize the risk of electrostatic discharge damageIn 2018, the Pi Foundation introduced the PoE HAT for the Pi 3 B+. That initial version had a fatal flaw: on many Pi boards, it could only supply about 200 milliwatts of power to USB before the current limiter reset. Martin Rowan first documented how plugging in almost anything besides a keyboard and mouse would trigger the Pi's overcurrent protection. In the end I find it slightly ironic that James Adams said in the 2018 post announcing the original PoE HAT's revision, and I quote: Dominic 9:34: Yes, but we needed the area. If you have a look at it, it is quite a dense board. But because we’ve been able to simplify some of the electronics now and integrate things more, especially around the area of the transformer, we’ve got this L-shaped board. And that then allows us to put it in the new Pi 5 case as well. This outputs the current in microamps, meaning at the time of the reading, the PoE+ HAT was supplying 0.6A to the Pi (0.6A at 5V is 3W).

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.

Please note

Hopefully this coil whine or whatever it is doesn't indicate a deeper issue—I haven't had time to dig in much, but it's really unpleasant to hear in person. 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. 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. What is the HAT for?If it’s for a particular project, does it do what you need it for? If it is for a child, does the HAT have enough features to grow with their learning? 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.

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? And further, I'm wondering if I need to fundamentally rethink this project as it seems like the way I'm setting things up will always kill the Pi. The Raspberry Pi PoE+ HAT is a new version of the original Raspberry Pi PoE HAT, now with 5V 4A output for the most demanding Raspberry Pi applications! It is designed to replace the original PoE HAT in all new and existing designs and meets all requirements of the IEEE 802.3af (802.3at Type 1) specifications. Power-sourcing equipment for an 802.3af Power over Ethernet network (such as a PoE Injector or PoE-compatible Router/Switch) So, might not be a new issue, just a reoccurence of an old one. It may not be related to the PoE HAT, just that adding one is making the issue appear in these two cases.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. It would seem that I've managed to kill two Raspberry Pi 4's in a short period of time. I was trying to set one up as an internet gateway powering it with a PoE HAT from Waveshare. What about the original HAT? Well, I configured the exact same Pi with the exact same microSD card, and the exact same port on the switch (and tried two other ports too, to make sure it's not a fluke), and the original PoE HAT only used about 4.1W at idle, for the Pi plus the HAT!