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Questions tagged [hub]

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Hot pluggable CAN collections of devices

I'm trying to create a network of hot pluggable collections of iot devices into a bus (Containing Device 'A') that will always be present. There could be up to 50 collections with each collection ...
iBax's user avatar
  • 11
0 votes
1 answer
76 views

Connecting multiple USB-capable ICs to a single port

I am working on a circuit where multiple components (ICs) are USB-capable for the purposes of programming (MCU), diagnostics, or firmware updates. Ideally, I would like to avoid having multiple ports ...
ITMan's user avatar
  • 13
1 vote
1 answer
155 views

RGB Hub using MUX and PNP

I have 2 RGB controllers that I am trying to connect through a multiplexer that will be controlled from a GPIO pin on microcontroller (Seeed Xiao SAMD21) so I can freely switch between the controllers....
superN8's user avatar
  • 97
2 votes
2 answers
616 views

What determines the maximum number of devices that can be connected through a single port of a USB 3.0 switch?

I need to connect about 10 different electronic devices (lasers, cameras, motorized stages etc.) to two PCs, such that you can choose to control the whole setup from either one of those PCs. My first ...
srhslvmn's user avatar
  • 131
0 votes
2 answers
497 views

How can I configure an Ethernet switch to a hub to use with Wireshark? [closed]

I would like to use Wireshark to watch the communication between my device and the server. I basically need an Ethernet hub to deploy the environment of testing. My trouble is that Ethernet hubs are ...
Stan Huang at Taiwan's user avatar
0 votes
1 answer
2k views

why did my powered usb hub kill my computer's usb port? [closed]

Curiosity kill the computer port. But why? I bought a 4 port USB 2.0 hub. I removed Vcc and Gnd from the Type A connector of the hub. Then I powered the hub and inserted a USB stick into one of the ...
kevin zamora's user avatar
0 votes
2 answers
634 views

Are large decoupling capacitors necessary for USB hub plugs

At the bottom of this data sheet: https://datasheet.lcsc.com/lcsc/1811151645_CoreChips-SL2-1A_C192893.pdf the reference circuit diagram shows huge 100uf decoupling capacitors connected to the USB ...
Hamid's user avatar
  • 75
0 votes
1 answer
231 views

USB Downstream Port (with Power Charging) [closed]

I have a Dell UltraSharp 32 4K USB-C Monitor: U3219Q with a USB Downstream Port (with Power Charging). I have the monitor connected to my laptop via USB-C. If I connect a USB device (let's say an ...
JoaMika's user avatar
  • 101
1 vote
2 answers
286 views

Why does 10BASE-T require hubs?

As I understand it, some of the physical layer options for Ethernet include:\ 10BASE5 (now considered obsolete): a single length of thick coaxial cable. 10BASE2: thin coaxial cable, of which multiple ...
rwallace's user avatar
  • 563
3 votes
1 answer
2k views

Do we need an IC to make a USB hub?

I am planning to make a USB hub for my PC. I was thinking about just making it like this: When I search the internet for circuit diagrams, there are many circuit diagrams with an IC. Must an IC be ...
Warriorrev6300's user avatar
0 votes
0 answers
716 views

Designing 7 port USB hub for a custom project

I am attempting to design a basic 7 port USB hub that will be used in a custom 3D printed case. It will connect to a FPGA device and be powered by a 5V adapter through a barrel plug. I'm stuck on a ...
OnCor's user avatar
  • 11
3 votes
1 answer
171 views

Why can't you make a thunderbolt 3 hub?

So laptops with thunderbolt 3 are pretty common, docks are common, every other kind of USB seems to be able to be used with a hub. I know thunderbolt 3 can be daisy chained, theoretically eliminating ...
Delaney Fitzpatrick's user avatar
3 votes
2 answers
566 views

Adding HDMI to a USB Type-C hub design

I've been working on this design for a client for a little while now. I can't go into full specifics, but the basic design is a USB hub. The IC I picked at the time met the design requirements that ...
TokyoScarab's user avatar
1 vote
1 answer
135 views

Is it possible to use ethernet communication between MCUs without using a hub or switch?

Is it possible to connect some MCUs together in a star topology, without using any hub or switch? EDIT: There will be a main MCU in the star topology and it will be receiving 2 different GPS datas (...
Raxian's user avatar
  • 25
0 votes
2 answers
175 views

PCB with multiple Arduinos and onboard hub

I'm designing a PCB for an astronomical observatory which needs several Arduino Micro to control different devices. Since the circuit must fit a very small space, I'm putting an onboard USB hub to ...
marcocipriani01's user avatar
0 votes
0 answers
69 views

Should I use Multi Transaction Translator?

I'm designing a board which has two USB 2.0 Full-Speed (12 Mbps) USB-UART controller (CP2108). These controllers will be communicating with the PC via an USB2422 HUB. This hub has got a Single ...
slimcolt's user avatar
  • 319
1 vote
4 answers
2k views

In a Shimano dynamo hub with 6V regulator is the rest of the power being wasted?

I bought a Shimano hub dynamo that gives a maximum of 6 V with a regulator that they have provided. From what others here have said, the regulator is a Zener diode. The output voltage of the dynamo ...
MikePainter's user avatar
1 vote
0 answers
220 views

USB 2.0 Maximum current through hub

I have a question regarding USB2.0 power negotiation. I'm in the process of improving the design of a support equipment PCB that utilises an FT232H chip. The layout of the current board consists of ...
Amdixer's user avatar
  • 11
2 votes
1 answer
1k views

USB2517 USB hub unable to enumerate

I've made a USB hub PCB using a USB2517 controller, but it's not working. When I plug it into the host computer, I get a "not recognised" message on Windows and "unable to enumerate" message on Linux. ...
Villanut's user avatar
0 votes
0 answers
175 views

Why wont Micro USB Hub work with UVC Receiver?

I want to charge my phone and be able to receive wireless signal via a UVC Receiver. So I ordered a Micro USB Hub Adapter that supports OTG and charging. Well, I tested the hub adapter today, but the ...
st4rgut's user avatar
  • 213
0 votes
1 answer
180 views

USB3/2 hub cascading (reverse hierarchy)

I want to implement multiple USB ports using one USB3.0 and one USB2.0 hub with four ports each. The microprocessor I want to implement these ports for has just a single USB3.0 port left (of which the ...
0x4859's user avatar
  • 3
2 votes
3 answers
574 views

USB hub inside modular keyboard for comunication

I'm working on a personal project which consists on a keyboard that also serves as a hub in order to connect more keyboards. For example, I could have the main keyboard with the letters and symbols ...
edoelas's user avatar
  • 123
0 votes
3 answers
1k views

GL850G-SSOP28 datasheet - Ferrites values? [closed]

I have found a circuit for using the GL850G chip to build a powered USB 2.0 hub: http://pdf-file.ic37.com/uploadpdf_old/GENESYS/GL850G-SSOP28_datasheet_898289/146940/GL850G-SSOP28_datasheet.pdf ...
Guillaume's user avatar
  • 139
2 votes
1 answer
946 views

Bldc hub motor starting torque

am designing a BLDC hub motor (48V-500W-15A max) I have designed a three phase inverter and the motor run normally with smooth rotation and as the motor start running and I apply the load the motor ...
Osama's user avatar
  • 23
5 votes
3 answers
18k views

Can I Build My Own USB Hub? [closed]

Would it be possible to make a USB Hub from scratch? Like, designing a PCB, and hand soldering components on to it? What microchip would I have to use as the controller? Is there a simple controller ...
skillz21's user avatar
  • 506
-1 votes
1 answer
469 views

Hub usb connected to ATX of the same desktop pc [closed]

I am new here and I am newbie in electronic. I studied electronic a lot of years ago. I am attempting to connect my usb hub to 5V output of my ATX of desktop pc, as explained here: Can an ATX PSU ...
Joe's user avatar
  • 3
1 vote
1 answer
4k views

Cloning a USB signal - feed two USB hubs with one input port

I have a schematic for a 4 port USB hub (4 output ports, 1 input port). I'd like to make two of these hubs and connect them together, thus making a 7 or 8 port USB hub on a single PCB. I know there ...
LachoTomov's user avatar
2 votes
2 answers
395 views

LED hub purpose?

What is the main purpose of LED hub, is it used only for RGB matrices to connect shift registers for every color or there are some other applications? I'm working with HUB75 and that is the reason ...
user avatar
2 votes
1 answer
697 views

choosing diodes for a passive ethernet hub

I found several guidelines for building a passive ethernet hub, mostly quoting this. The guide specifies which diodes to use, but I cannot find them anywhere. What are the parameters I should search ...
Adam Trhon's user avatar
1 vote
3 answers
582 views

Wheel speed from Shimano dyamo hub using arduino

I'm trying to figure out a way to extrapolate wheel speed from the Dynamo hub I just purchased. I outputs 6V 3W AC, and I would like to potentially measure it using an arduino if possible, I' assuming ...
user379468's user avatar
0 votes
1 answer
2k views

Make simple 3 port ethernet switch/Hub [closed]

How can I make a simple cheap 3 port Switch? I have 30 10-base low speed Ethernet devices and I want to connect them together, how can these devices connects together with simple Bus topology? ...
Autumn's user avatar
  • 27
5 votes
2 answers
4k views

Homemade ethernet hub not working with three computers [closed]

I am trying to connect three computers in one network. I have connected the wires like the photo. I works with two computers but not three computers at the same time. For example, let's name the ...
mustafa öztürk's user avatar
1 vote
0 answers
334 views

USB hub acting differently towards another hub and device

I have a USB hub that supports individual port-switching. I'm shutting off a port using the libusb library. When there is nothing connected to the port, the power pin drops from 5V to 1.5V and slowly ...
m126531's user avatar
  • 89
0 votes
1 answer
570 views

Passive Ethernet Hub / Point to Multipoint Ethernet

I have a device which needs to connect to one of three devices using ethernet. When one device is connected, the other 2 will be powered down. Power consumption is a factor, so I'd like to use a ...
John's user avatar
  • 173
0 votes
1 answer
656 views

External powered USB hub

I am planning on building a quite large USB hub, which final use is to connect, charge and sync let's say 40 iPads. The iPad electrical specification from Apple states that each unit needs to have ...
Martí Gascó's user avatar
-2 votes
2 answers
602 views

raspberry pi + USB Hub [duplicate]

I bought a cheap USB Hub Powered to connect my Raspberry Pi and two External Seagate HD (USB 2.0/3.0), but obviously that 400 mA is not enough for all this things. So, I want to buy a new AC Adpater ...
Makah's user avatar
  • 97
5 votes
2 answers
891 views

Question related self powered USB Hub

We have a requirement, which is a normal self powered USB Hub, with individual power control of the ports, i.e in addition to a normal Hub, we want to remove the power to any of the downstream port on ...
user19579's user avatar
  • 1,398
8 votes
4 answers
5k views

Ethernet Without a Switch?

How do you wire up Ethernet electrically without a switch? An approximately equivalent phrasing of this question would be what is going on electrically inside an Ethernet Hub? To clarify, I'm not ...
vicatcu's user avatar
  • 22.8k