Questions tagged [hub]

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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 ...
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1answer
31 views

In a shimano dynamo hub with 6V regulator rest of power is 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. But the output voltage of the ...
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0answers
18 views

Communicate and charge both arduino board and android tablet

We want to connect and arduino to an android tablet via USB and charge both at the same time. We have the arduino talking to the tablet and the tablet is running a nice app to display the data from ...
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0answers
34 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 ...
1
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1answer
119 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. ...
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0answers
48 views

Segway motor not running after vel_setup command in odrive?

I am testing odrive to control segway motor. I finished the setup from documentation but the motor is not moving after sending this command in terminal:- ...
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0answers
39 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 ...
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1answer
43 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 ...
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3answers
250 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 ...
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3answers
744 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 ...
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1answer
466 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 ...
5
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3answers
11k 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 ...
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1answer
219 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 ...
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1answer
2k 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 ...
2
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2answers
310 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 ...
2
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1answer
534 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 ...
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3answers
486 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 ...
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1answer
1k 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? ...
5
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2answers
3k 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 ...
1
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0answers
317 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 ...
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1answer
500 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 ...
0
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1answer
577 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 ...
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2answers
580 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 ...
5
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2answers
712 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 ...
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4answers
3k 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 ...