Raspberry Pi's PoE HAT Ships For $20, Tosses in a Free Fan (linuxgizmos.com) 90
Raspberry Pi is offering a Power-over-Ethernet HAT board for the RPi 3 Model B+ for $20 that ships with a small fan. Per blog LinuxGizmo, the "802.3af-compliant 'Raspberry Pi PoE HAT' allows delivery of up to 15W over the RPi 3 B+'s USB-based GbE port without reducing the port's up to 300Mbps bandwidth." From the report: The Raspberry Pi PoE HAT features a fully isolated switched-mode power supply with 37-57V DC, Class 2 input and 5V/2.5A DC output. The HAT connects to both the 40-pin header and a new PoE-specific 4-pin header introduced with the B+ located near the USB ports. To enable PoE, you need power sourcing equipment, which is either "provided by your network switch or with power injectors on an Ethernet cable," writes the foundation in a blog post.
Re: Wait what (Score:5, Insightful)
Linux at its best
Has nothing at all to do with Linux, but the hardware on the Pi. Ethernet connections go though USB 2.0, which limits the bandwidth.
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Bad chipset then, good USB ethernet chipsets compress the datastream over USB, thus can get higher transmission speeds.
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Re:Wait what (Score:5, Informative)
The gigabit ethernet port is connected to the CPU via a USB 2.0 on the board, so that is your bottleneck.
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So all I/O is still over a single USB bus?
I understand there needs to be cost cutting somewhere in devices like this but it's the single component that has never been updated. PoE and network booting is really useful and I think I'll upgrade. More I/O bandwidth would kill the competition.
Re:Wait what (Score:5, Insightful)
The whole point of the Pi project was to make a learning tool for students as cheaply as possible. There are hundreds of other single board computers out there with more features and bandwidth. Use the right tool for the job.
Re:Wait what (Score:5, Insightful)
The whole point of the Pi project was to make a learning tool for students as cheaply as possible.
They've also been *incredibly* popular in industry. It's pretty common to need a SBC to do some shit and it's not performance sensitive. The fact there are cheaper and more powerful ones doesn't really matter: the Pi is well understood, easy to source next day, and well documented and available for long periods of time. Saving a few bucks is nothing compared to the engineer time not spent messing around.
Likewise the Arduino has revoloutionised vendor devkits.
Weirdly these threads seem to be full of people basically complaining you don't get a fast desktop for 25 dollars.
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Weirdly these threads seem to be full of people basically complaining you don't get a fast desktop for 25 dollars.
Or, these threads are full of low effort Trolls commenting on things they don't understand.
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It's GbE, but throughput is only 300 Mbps. that's f...ed up.
That's USB 2.0 limited speed which is how the Pi works for pretty much all it's basic IO ports. Love it or not, that's a Pi.
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It's a hardware limit based on the Pi's cheapness... Can you hear me now?
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That is the bad engineering found everywhere in the Raspberry Pi. The competition has native Ethernet or native GbE.
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That is the bad engineering found everywhere in the Raspberry Pi. The competition has native Ethernet or native GbE.
Great! If I ever need more than 300mb/s of bandwidth, I'll be sure to check out the competition. In the mean time, the Pi has proven more than powerful enough for every task I've used it for. In the mean time I'll stick to the Pi because it's well engineered enough, cheap enough, has a long product life and involves zero fucking around.
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Fun fact even 10BaseT works fairly well. Many would dream of symmetric 10/10 low latency Internet.
That is a very good point.
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the bad engineering found everywhere in the Raspberry Pi
So good engineering would have rewired the SoC's architecture?
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No, good engineering would, among other things, not have used an inferior Broadcom SoC in the first place. Seriously. Do you think they are the only ones that make SoCs of this class?
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Because performance is all that matters, and you get the performance for free, basically. Right?
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What are you talking about? This is not about performance, this is about interfaces.
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It's GbE, but throughput is only 300 Mbps. that's fucked up.
That is the bad engineering found everywhere in the Raspberry Pi
Throughput is performance.
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No, throughput is a specific aspect of performance called throughput (actually network-throughput to be exact). That is why there is a separate word for it. But that is not the real problem. The real problem is that networking over USB is basically a hack that causes numerous problems. And it is an entirely unnecessary hack as SoCs with integrated networking exist that are comparable or better in all other aspects. They are just not made by Broadcom, and the RasPi people are in bed with Broadcom. Also expla
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You can't be serious.
Throughput is performance
No, throughput is a specific aspect of performance
Yes, dimwit, throughput is the specific aspect of performance that we're talking about. It's not wrong to say we're talking about performance when throughput is an aspect of it.
I can't believe you're maliciously nitpicking in this way while also saying
But from your use of discussion-sabotage techniques I see you do not want to actually discuss facts. That is fine, just do not expect to be taken seriously.
I recommend you take a piece of your own advice and fuck off.
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It's limited by the USB link.
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The funny thing is the Raspberry Pi foundation resisted putting GigE on their Pis for years, because it only has a USB 2.0 bus and it wouldn't run anywhere near GBE speeds.
But all the competitors products had GigE (connected to a USB 2.0 bus), and their customers kept saying "we love the Pi, but why does it only have Fast (100M) Ethernet? Why can't you do GigE like every other single board computer?
I'm guessing they got sick of arguing the point and in the Pi 3 just went "Fine, you want GigE that runs at US
Probably the usual, really bad quality (Score:2)
This is VHS against Betamax all over,
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I'm just disappointed it's not really a hat. I thought this was a wearable joke computer and I clicked on the link so see what its power supply was.
Nice, but what's the temp specs? (Score:2)
A fan is nice, but what is this thing's environmental specs these days?
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If I'm looking at the pictures right, that fan also seems to cover the GPIO pins entirely... Wouldn't that kill a ton of use cases for someone deploying this thing remotely with a PoE setup?
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I admittedly skimmed it and missed that part. Still sounds stupid though, now you have to buy a second board to cover most of the use cases anyway? So now the cost is doubled at least (depending on how difficult/expensive the pass through headers are) and it isn't really an out of the box solution.
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You don't need to buy a second board. There aren't that many HATs for the RPi - most people just connect their peripherals directly to the lines themselves.
And passthrough headers are trivially easy to come by - t
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That sounds more workable then. I guess I need to get my Pi back out and play around with it again. I got a 3 a while back and it got mothballed because all the stuff I wanted to use it for became overly complicated really quickly. I liked the idea of being able to do PoE when I saw this, but guess I'm not familiar enough with the other parts for the boards.
any IO will slow the 1 USB bus on this (Score:2)
any IO will slow the 1 USB bus on this
Will it fit in a standard case? (Score:2)
Any ideas?
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Re: Will it fit in a standard case? (Score:2)
Wasn't the whole point of the RPi his price?? (Score:1)
If I wanted to pay $20 for a mere module, I would buy a whole PC.
Where are the disposable computers you can buy in a 12-pack at the discount store?
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A five port unmanaged 100Mbps 802.3af PoE switch delivered from Amazon will set you back just under 26GBP here in the UK. The cheapest 802.3af injector I could find would set you back 20GBP. If you want a Gigabit PoE switch they will set you back around double. Thar is hardly expensive.
Re: Not a bad price (Score:1)
I use a proper PoE adapter which plugs into the USB and Ethernet ports, it costed me 9 bucks.
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Two questions (Score:4, Funny)
I love my pi, but... (Score:2)
I get the impression the costs are slowly creeping on this thing and the features kinda stagnant.
Firstly, to my knowledge, it's STILL 100Mbit networking isn't it? Routed through USB somehow? For most Pi functions, this isn't going to impact people, but if you are an American / European running a Pi and using it as a regular speed test unit
https://www.google.com/search?... [google.com]
You'll see that anyone with a particularly beefy internet connection will be limited.
Also the CPU is almost good enough to perform ligh
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You're right, however,.......
"Gigabit Ethernet over USB 2.0 (maximum throughput 300 Mbps)"
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and the features kinda stagnant.
Counterargument: That's not the point. This isn't an iPhone keynote where hype generation is a part of the process. RasPi has been being on having an open source hardware design and a low barrier to entry that enables everything from amateur electronics with its GPIO to being an inexpensive first computer for programming and development to the ability to turn it into an appliance for anything from a Chromecast alternative to a home automation system powered by an Ocarina. It may not have whizbang features o
Stupidly blocks IO pins (Score:2)
Or you could get one that doesn't block all the IO pins https://amazon.com/NavoLabs-Ra... [amazon.com]
The I/O Reality of Pi (Score:1)
In our testing with Raspberry Pi's (Specifically The RPi 3 B+) total hardware I/O has never exceeded 22MB/s. On the note of better quality chips with a higher process tends to cost more on the hardware side, and kernel development to build around a newer chip will take time. It's a bit of a double-edged sword pushing a simple SBC from as cheap as $3 to make and pushing it to $75 or more to make completely negating the purpose of inexpensive computing solutions for small projects. No matter how you slice it,