13
votes
Best way to power multiple Raspberry Pi 4s?
The official Power Requirements of the Pi 4B is 5v, 3.0A - I.e. a total of 15W maximum power requirement from each of the Pis, so a 60W USB power supply, or larger, would be ideal. This is a maximum, ...
- 233
5
votes
RPI4 won't boot with powered USB hub
The issue could stem from the fact that some cheap USB hubs back-power an unpowered host when those hubs are powered: essentially, the 5V circuit of the hub is directly connected to the 5V line of the ...
- 28.2k
5
votes
Accepted
Powered USB3 Hub vs USB3 Y Power Cable
This answer is incorrect.
Depending on model & OS USB can supply 1.2A.
Typical Power Requirements
I doubt it would work, according to this page: USB - port power limits the Raspberry Pi USB ...
- 313
4
votes
Is it possible to prevent the Pi from receiving power from a powered USB hub?
Theoretically it is impossible to backpower a PI3 (or other modern models).
However tests by a member indicate that if the Pi is powered on, it will remain powered through the hub.
This is arguably ...
- 61.5k
4
votes
Accepted
USB ports stop working after a week, needs restart
Here's a method about controlling the power to ports on a USB hub,
using software - the hub-ctrl.c app from a question that another
post above links to.
It can be used to wake up the USB ports (at a ...
- 162
4
votes
Accepted
Raspberry pi zero refuses to detect USB hub - tried multiple hubs
I already have an OTG hub that works fine either powered or not as described here, but note when the hub is powered, it must be used to provide power to the Pi, since otherwise there would be two ...
- 60.1k
4
votes
Iot hub and rasberry pi
It looks like you are asking for a tailored solution for your DiY project. Well I think the following links can point you to right direction as these are tutorials for interfacing RaspPi to Azure IoT ...
4
votes
Accepted
Pi with multiple HDDs from a powered hub
Will the read speed of each hdd drop the more hdds I add due to the pi usb controller?
This is exactly what will happen. Connecting multiple HDDs (and the more so SSDs) to an RPi to increase disk ...
- 28.2k
4
votes
Accepted
Could the Raspberry Pi be programmed to be a smart USB Hub?
In order for the Raspberry Pi to be recognised as a USB peripheral (which a hub is) by another computer, it would have to act as an USB slave. The Raspberry Pi B can only act as a USB host, so you'd ...
- 156
3
votes
Is it possible to prevent the Pi from receiving power from a powered USB hub?
Thanks to gadgetoid and niko over on the Pimoroni forums it seems the fix was twofold:
Cut the 5v+ wire on the USB cable (assuming you're powering it separately than the Pi)
Add a 1k resistor between ...
- 173
3
votes
How to make a Raspberry Pi Hub yourself?
Note that the very same hub you have bought exists in OTG variant as well:
This one should work with RPi Zero just fine. Check out the shop you got your hub from: perhaps they have the OTG model as ...
- 28.2k
3
votes
How to make a Raspberry Pi Hub yourself?
You should be able to, although as per my comments it probably is not necessary; all you need is a commonplace OTG adapter. Based on the wikipedia description, however, you could make one yourself ...
- 60.1k
3
votes
Accepted
Multiple Raspberry Pi Zero to ethernet
Sorry, that wont work. Only the 'master' Pi0, plugged in to the 'uplink' port using a OTG cable can use the gadgets, among which all the other Pi0's and the builtin Ethernet adapter. You could ...
- 46
3
votes
RPI4 won't boot with powered USB hub
Had the same powered usb hub issues with my pi4.
If connected to pi + hdd+ power ----pi hangs.
If connected to pi + no HDD + power --- pi hangs / does not boot.
Note in the above cases pi was headless....
- 31
3
votes
Error when connecting more than ten USB devices on Raspberry Pi 4
The theoretical limit for USB is 127 devices. But, that is not really true.
First of all, the limit of 127 may not be 127, but 96. Yes it looks like a USB 1.1 hub in your log and the 96 limit is for ...
- 2,539
3
votes
How many HDDs can be connected to a raspberry pi zero 2w (by using usb hubs)?
The maximum number of USB devices on a bus is 127. From that number, you must substract the root-hub and all the other hubs that you need. Note that some hubs use more than one USB devices.
Also, some ...
- 2,539
3
votes
I broke SSH access to my Raspberry Pi
As pointed out by Jaromanda X, the ethernet NIC on the Pi 3 (and earlier models) is integrated with the USB controller. There is a bit of a clue in the first line of that uhubctl output ("5 ports&...
- 60.1k
2
votes
How to Boot from one usb drive but have multiple drives connected to hub
@conrad_heimbold is right, and editing /boot/cmdline.txt with the PARTUUID will actually boot your Pi.
However, he is wrong in one place. If you place quotemarks around the PARTUUID, your Pi will ...
- 21
2
votes
Accepted
Pi Zero W power through usb socket
I can't answer your question directly, as I don't have that particular OTG cable.
However, I do have a usb hub connected to my Pi Zero W USB data port, and the power from the hub is powering the Zero ...
- 36
2
votes
Pi Zero W power through usb socket
The Pi Zero W has two micro USB ports:
Micro USB On-The-Go, labeled "USB" - this is where the hub is connected
Micro USB power, labeled "PWR" - this is where the power supply for the Pi is connected
...
- 15.9k
2
votes
USB hub raspberryPi
Don't know what you mean when you say that "most of the [host-powered] hubs are built for the Raspberry Pi". But let us be clear: A host-powered USB hub is NOT generally what you want to use with a ...
- 22.9k
2
votes
RPI4 won't boot with powered USB hub
You have to make sure that you are getting consistent 5V from the USB hub, and at the very least 1 Amp in current... most usb hubs will only regulate to 500 mA which sounds like what you were getting ...
- 146
2
votes
Accepted
RPI4 won't boot with powered USB hub
I found the exact same issue in a Reddit post and the solution seems to be a frustrating one - find a more expensive powered USB hub. Oh well.
- 193
2
votes
RPI4 won't boot with powered USB hub
tldr; .. Chain it with an unpowered hub in between.
I had this problem, too. I believe I found a tenable solution. I happened to have a spare Ankur unpowered hub that I thought maybe could take the ...
- 121
2
votes
Best way to power multiple Raspberry Pi 4s?
Los Alamos labs looked at powering a huge cluster of RPi to cheaply simulate their supercomputer cluster . Out of that came the Bitscope blades which will mount 4 Rpi per blade and host IIRC ten ...
- 776
2
votes
Using USB hub to power external hard drive
Some USB hubs come with a port to connect to the host device, and a power cable that plugs into an outlet to power all the USB devices separate from the host device. Many USB 2.0 hubs use this, as USB ...
- 21
2
votes
Raspberry doesn't recognize me disconnecting a USB device
uhubctl author here - I have described this issue in uhubctl FAQ:
USB devices are not removed after port power down on Linux
After powering down USB port, udev does not get any event, so it keeps the ...
- 509
2
votes
Accepted
Disable USB driver on RPi Zero W
I've not been able to test this on a PiZero, but it does work on other RPi hardware. It may be worth a try - I'll leave that to you. In either case, please give us the courtesy of some feedback: ...
- 22.9k
2
votes
Accepted
Is it possible for a Raspberry Pi Zero to act as both a Usb Gadget and a Usb Host?
Maybe not all usb hubs support the feature?
None of the hubs support this feature. Hubs only have one upstream port, and it's impossible for the same hub port to be both upstream and downstream.
...
- 28.2k
2
votes
Accepted
Raspberry pi-4 powered usb hub backfeed issues
This is strictly not backfeeding, as you need to first boot the Pi from another power source, but still annoying.
Backfeeding was a problem with the Pi Model B (which had a very basic power circuit).
...
- 61.5k
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