USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.

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USB - SelectConfiguration request fails with Invalid Parameter error

I am trying to develop my own DisplayLink device with STM32F429 Discovery board. I have Lenovo LT1421 display also, which is an original DisplayLink device and I am using it as a template (usb ...
7
votes
3answers
185 views

How to Connect USB/Ethernet Shields to Chassis or Digital Grounds

I have a PCB with a few USB and RJ-45 Ethernet connectors on one side. I'm quite confused as to how exactly I'm supposed to be hooking up the SHIELD pins on them though. This is for a host device ...
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1answer
37 views

Fast write/read on NVRAM with Windows

I am trying to find a solution to create a 4MBit NVRAM module (FRAM or SRAM, doesn't matter) with a standard PC with Windows. I want to store up to 1MB of data in less than 1 second with 50-100 write ...
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0answers
27 views

OTG-USB: Can a device be charged and offer a USB and an ethernet conection at the same time? [migrated]

I have a device that supports OTG over it's micro usb port. I'm looking for a device that connects to that micro usb port and offers a female micro usb port for charging, a female USB port for flash ...
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1answer
40 views

How to power 12V LED Strip with 5V USB via Computer Mouse Controller?

I'm a electrical idiot, really appreciate it if you could explain in layman terms. I want to use the mouse electrical board, to power and control colours of my LED strip. This is for the chassis and ...
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0answers
76 views

Powering a Magic Mirror

Background: I am trying to create a magic mirror similar to this: Problem: I need to power two devices, one monitor and one raspberry pi. My approach was the same as in the article (which also ...
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1answer
60 views

Working on a high current USB charger

Title says it: I'm working on building a high current USB charger for my devices so that I can integrate USB ports into my headboard. However, I'm having a few glitches. When I plug in a device, the ...
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3answers
204 views

Regarding CPU speed required for USB applications

I am working on a project for developing a USB keyboard, and I am new to USB protocol and I did initial study regarding basics of data transmissions through USB. I am now checking for USB supported ...
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0answers
36 views

jlink This device cannot start. (Code 10) in win7 after update driver

I have one J-link ARM programmer, SO for first time i start it via KEIL software, and KEIL updated it's Driver, So after driver Updated , it's made crazy!!! and the led of its got down , so when i ...
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1answer
41 views

How can I send keyboard input to USB port or Serial Port?

Now, I am using Windows 8 and have made Arduino buttons to operate as an keyboard's 4 arrow keys(up,down, right and left). From this moment, I am going to send this keyboard input event out to the USB ...
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5answers
130 views

Baud rate vs. Bit rate

When we initialize a serial communication, we usually have to set the baud rate (e.g. 115200) I notice that many people assume that 115200 means 115200 bits per second. However, each baud(signal ...
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1answer
17 views

How to connect Phone to Robot while charging phone from external battery?

I am controlling a robot via usb from an Android phone running the robot's code. This phone has a poor battery and I need to extend its life with a USB charger (can't change phones). How can I charge ...
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2answers
75 views

Split External 5V PSU 4 ways

New here + reasonably new to electronics - can solder + hack, but anything finer I need help with! Building a games rig out of an old console case. I'm looking to have the PSU outside of the unit to ...
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1answer
38 views

Who opens pipes in USB communication?

I just need to know who in the USB communication must open the pipes. Endpoints are already configured, descriptors was sent and now there should be a process of pipes opening (between correct ...
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4answers
702 views

How do I decouple ground planes?

I have designed and built a motor controller circuit. The circuit has a microcontroller on which gets commands from a PC using an FT232R. Currently the FT232R is powered from the board's +5V supply. ...
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1answer
57 views

Convert USB3 to WIFI [closed]

What methods could be used to convert USB3 communication to WiFi, when there is no access to the device's OS?
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1answer
43 views

how can I current-limit a Raspberry Pi 2 USB host port so phones/tables do not try to charge

Although my use case is specific to Raspberry Pi, I think the question is a general USB Host port question. When a phone/tablet (especially iphone and ipad) is connected to a Raspberry Pi 2, if its ...
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2answers
83 views

Output data from computer to light up LEDs

I'm a complete newbie at this, but the idea is to have a circuit board with, say, 10 LEDs, connected via USB to a computer running Linux. This will periodically (e.g. every second) send data to the ...
2
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0answers
59 views

Software only USB implementation for ARM-M0/M0+?

Since I'm worried about the future of AVR, I've been looking into software USB for ARM cortex-M0/M0+ that is similar to V-USB. All I've found is a port of LUFA, which is for MCUs with internal USB ...
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votes
1answer
105 views

What does it mean when a charger has 5V 0.7A?

For my phone (Samsung Galaxy Note 2) I have several chargers. I noticed that with some of them it takes much longer to charge the phone, to the point that a whole night is not enough to charge it. So ...
4
votes
3answers
118 views

Why is USB type C connector hollow?

If we look, for instance, at a Lightning cable, its connector is shaped like "—", with receptacle being "=". Apparently, this construction contributes to durability, to the ease of use, and lowers ...
0
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2answers
112 views

Designing USB device [closed]

I want to build a USB peripheral device. The Device is to connect to an Android smartphone with USB OTG capabilities. The smartphone will be a host and will run an app that communicates with my ...
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0answers
39 views

Raspberry Pi 2 Arduino Mega USB Communication [migrated]

we are trying to control our rover via wifi. the idea is motor drivers are connected to arduino mega and the mega is connected to raspberry pi 2 (raspbian os) via USB. raspberry pi is receiving ...
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0answers
84 views

How to get a constant voltage (8.5 - 16 V) at 70mA from a USB port

I'm working on a project with a sensor that needs power voltage between 8.5v to 16 v, and need 70mA current for work. I searched on the internet and I found some ICs but I'm worried about the current ...
3
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1answer
322 views

Interfacing USB with a microcontroller

I am designing a development board for STM32F103 microcontroller. I plan to implement an on-board USB for interfacing with the uC. I referred a few designs online and have always found some pull up ...
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1answer
72 views

How to design a keyboard circuit that can use a passive USB-to-PS/2 adapter?

I'm designing a small device that will act as a USB HID keyboard, but it must also work with PS/2 hosts. I would really want to be able to use it with one of these nifty passive USB-to-PS/2 adapters ...
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0answers
33 views

Build USB demo for PIC24FJ64GB002

I am trying to build the simple MSD demo from the microchip application library by following what this person did here http://www.microchip.com/forums/m717252.aspx. To do this I took the ...
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1answer
238 views

Detecting When a USB Device Is Plugged In For Status LED

I've seen this asked a few times, but no definitive answers. I've also been Googling this for a couple days now with no definitive solutions. So time to ask... I'm building a fast charge USB charging ...
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1answer
32 views

SharkX6 Flight Controller USB data connection cable

I have a SharkX6 flight controller (FC) that I am using in a quadcopter that I am building. The flight controller came with a broken (the fried IC is to the left of the '100' component) power ...
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0answers
34 views

USB Power Cable Only [migrated]

I have the following device: http://www.delock.de/produkte/G_61883/merkmale.html?setLanguage=en The two connectors, when plugged in a USB 2.0 port should output 1A which is enough to power on any ...
0
votes
1answer
40 views

Sending multiple electrical signal to PC via Serial port

I am doing a project in which I want to control small toy car using EMG signals from my forearm. I want to send 4 electrical signals to the computer. I have made a processing circuit which contains ...
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2answers
44 views

Static Discharge on Metal Enclosure for Tablet causes restarts

The setup I currently have is a Aluminum enclosure for an Android Tablet. Inside the enclosure, a shielded USB cable is routed into the micro USB port and out through a small opening. This cable is ...
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0answers
16 views

Arduino with multiple buttons - will power be an issue? [migrated]

I have a, hopefully simple, question related to creating a circuit with an Arduino board; feel free to dismantle the idea, I'm, unfortunately, not well-versed in electronics. I have a spare Arduino ...
0
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1answer
62 views

Convert usb scale output to serial

I would like to convert the usb output of a scale to a serial format so I can read it through a com port. I saw this tutorial from adafruit Adafruit serial scale but that scale is not available ...
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0answers
44 views

USB interrupt bandwidth allocation

I read an article here related to interrupt driven USB. AFAIU, the bandwidth allocated for interrupt transfer is expresssed by the "bInterval" variable in the endpoint descriptor. But when i look at ...
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0answers
10 views

Using USB CDMA dongle with USB extension cable goes into cable unplugged loop. Need help [migrated]

I'm using ZTE AC3633 cdma dongle which gives me internet over EVDO network. If I connect the dongle direct to the macbook pro its working fine, but sometimes signal drops and have to go out and fetch ...
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0answers
53 views

orcad 16.6 4-layer pcb design

I'm new to four layer pcb design. I have designed two layer PCBs using orcad 16.6. So I'm somewhat familiar with orcad tools. But I'm going to design a circuit which includes ECG filter, USB lines, ...
6
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1answer
128 views

Two-sided connectorless USB on a PCB

This question is inspired by Connectorless USB on a PCB. I saw a cool USB LED on AliExpress that can be inserted in either direction: I'd like to build a board with a similar symmetric ...
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2answers
42 views

Which way do the white and green wires go in a usb connection?

I am making a system that requires the white wires and the green wires (in usb cables) need to kind of be on a diode. Which one goes to the computer and which goes to the USB device?
4
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1answer
42 views

Is it possible to split USB 2.0 control requests?

I'm developing an application for microcontroller with onboard USB. The application is supposed to be as portable as possible, so I can't just point to one family in particular. I'm in the process of ...
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3answers
60 views

Will Cutting the Data Lines of USB Still let power to go through?

A USB 2.0 Cable should have 4 cables. They are the Vcc, Data+, Data- and Ground. If I only cut the Data Wires and let the Vcc and Ground wires connected. Will it still be able to transfer power or ...
2
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2answers
50 views

Will cutting only the Power Lines damage the Data Lines or the Device?

A USB 2.0 Cable should have 4 cables. They are the Vcc, Data+, Data- and Ground. Will only disconnecting the Vcc OR Ground Wires damage the Connected Device or the Data Wires? I currently have a USB ...
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1answer
57 views

If a USB Cable is being used between two devices, are the power wires needed?

I am trying to figure out a way to give power to an android tablet and a DSLR camera at the same time (for a photo booth). I was able to purchase an AC adaptor "battery" plugin for the camera, but ...
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2answers
119 views

PIC32 acting as USB CDC HOST to FTDI

I'm hacking a design who is already made with a PIC32MX in order to attach a FTDI CHIP to the actual design. This FTDI it should serve a purpose to make a "bridge" between USB and UART in the way to ...
12
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2answers
373 views

USB signal routing - Swap data lines using vias?

I'm making my second USB design, but the D+/D- pins on the MCU (atemga16u2) aren't in the right order for the micro B connector. What's the best practice for routing these to go the right way? My ...
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0answers
48 views

How to amplify a USB signal for long range applications? [migrated]

I have a long range wired application (over 5 meters). I have tried using a wire extender, But the computer is not able to detect my device(a USB camera). I tried using a USB 2.0 Hub. The computer ...
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1answer
45 views

Question about FTDI USB-to-Serial Evaluation board [closed]

The evaluation board I am talking about the FTDI EVAL232R evaluation board which can be found at the bottom of this page. It employs a FT232RL IC. What I want to do I would like to connect a USB ...
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0answers
29 views

Detect connected Cellphone (USB) via Arduino

I have to detect a usb connected mobile phone via Arduino but still pass the data signal to another device. Now it works great if I just connect the USB directly to the Arduino and read the pull ...
0
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1answer
68 views

USB protocol PIC32mx

I am adapting a design using a PIC32MX (which is actually working) to put an extra add-on. The add-on is a fingerprint reader which communicates via UART. Regarding that I have the USB pins exposed in ...
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2answers
75 views

10 USB Hub ICs from 1 Crystal Oscillator?

I am designing a PCB with 10 individual USB hub ICs onboard. They all require a clock input and I am wondering if it is possible to drive all the clocks from a single crystal oscillator? The hub IC ...