Questions tagged [usb-device]

Quesions about the design of USB devices that connect to a USB host, such as a PC.

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0answers
205 views

Interfacing NAND flash with USBMSD

I'm trying to read files from a NAND flash (K9LAG08U0M) that I took off an old MP3 player, so far I've been able to read the NAND contents successfully by interfacing it to my PC as a USBMSD (Mass ...
16
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2answers
10k views

Does a self-powered USB device have to connect to VCC from the host port?

A self-powered USB peripheral provides its own power, so is it okay to connect just D+, D- and GND to the host port, or do you always have to connect +5V as well, then wait for the negotiation phase ...
20
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2answers
73k views

What exactly are the differences between a USB host and device

Came across some doubts: What exactly are the differences between a USB host and device? Is it just that who powers the bus? When two devices connect how the device say "hey I will be the host and ...
3
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1answer
5k views

Texas Instruments USB2ANY HPA665

I encountered device made by Texas Instruments with label USB2ANY HPA665. It has LED, mini USB and FloppyDiskDrive-like ports. I can't find any data-sheet, manual or resources what for and how to use ...
14
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1answer
1k views

How can V-USB screw up the built-in SPI of an ATmega328p?

I'm working on a V-USB project that shows up as a Keyboard using an ATmega328p. The USB part is working great (it's not my first V-USB project), but after I start the V-USB stack with ...
3
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2answers
3k views

USB serial emulation: CDC or vendor-specific?

When designing a device that requires communication with a PC via a virtual serial port over USB: When would one use usb-serial port emulation chips with vendor-specific drivers (e.g. FTDI) and when ...
3
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3answers
5k views

Solutions for implementing a USB Mass Storage Device

I'm trying to figure out a convenient way with which a PC can configure an embedded system. The PC will have a custom app. written that can 'talk' to the embedded uC and configure the various settings ...
0
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1answer
113 views

Help me interpret this part of the USB + Power Standard

It's the last two sentences of this section: What does the last sentence mean exactly? And how do I apply it? Basically I am building a USB + Power peripheral that will convert USB to RS-232 and ...
0
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1answer
45 views

bluetooth earphone with usb

I have a Sony bluetooth earphone. It has a usb terminal, which I thought it was only for the purpose of charging power. But when I connected it to a computer, it seems like it is detected as a usb ...
1
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2answers
3k views

High power LED's and a computer Power Supply?

Is it possible to dynamically power a multitude of approximately 1W LED lights via a computer/computer power supply. Ideally I would like to be able to control these LED's via a USB interface or ...
7
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1answer
396 views

If I change the chipset of a USB product, should I change idProduct or bcdDevice?

The product looks outwardly the same, with the same model number, but the USB brains have been completely replaced, and the circuitry's been modified to fit them. The operating system needs to see ...
5
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6answers
2k views

Need a device that can take single input and covert to a keyboard key press on USB

Let me explain what I'm doing currently. We have made a finger heart rate monitor, each time your heart pulses a transistor is switched on via its base. The collector and emitter of the transistor ...
5
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1answer
2k views

USB composite device driver

I am wondering if it possible to create a USB device (in following the device) composed from a custom circuit (eg arduino) and ...
2
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1answer
701 views

USB inrush current

This is related to a few different questions (question 1, question 2). From question 1, I have a device with rather high decoupling capacitance which exceeds the USB 2.0 ...
1
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3answers
745 views

Drawing 100mA / common ground for a bus-powered USB hub

I am trying to provide an external 5V power supply to a (previously) bus-powered USB hub. My first attempt at this was to just connect the USB host's data pins to the hub's data pins, and the ...
6
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1answer
6k views

How to make usb 3G modem signal stronger with aluminum foil antenna?

I'm in an area with weak signal reception, but I'd like to make my 3G connection better at very low cost. I heard using aluminum foil as reflecting surface and placing the modem in some way in front ...
5
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1answer
2k views

How do they calculate the output power?

I'm building a quadcopter using Cortex A8 and I would like to use this USB WIFI dongle. According to the description this is 3000 mW. What does this mean? 3000 mW consumption? In the USB 2.0 the ...
3
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3answers
10k views

How can I easily connect to my breadboard circuit using USB?

I'm looking to communicate with a circuit I have built on a breadboard. I would like to communicate using USB. Can anyone suggest an item that I can use to accomplish this? Are their any other ...
1
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2answers
542 views

USB Hub project

I have a D-Link 7 port USB 2.0 hub model DUB-H7 The hub has a AC power supply that came with it, 5v 3amp output. Problem, the hub will not supply 5v power to the 7 ports unless it is connected to a ...
1
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2answers
315 views

Anyone know of a good/cheep usb dongle to pick up ULF (.3 - 3kHz) radio?

I've bought a pack with 3 temperature senders and 1 receiver. But I want more, and I also want datalogging. Is there a USB dongle that let's me pick up on a given frequency, lets say '433.92 Hz' and ...
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3answers
9k views

Supply power to USB with external power supply

I have a device (pyro-electric array detector) that connects to the Pc vis a usb. The device itself has an additonal power supply as well. Now a strange thing happens: If I connect the device to a Pc-...
3
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2answers
2k views

Need Realtek's rtl8188cus (WiFi USB dongle) datasheet. Any advice?

I have to develop a driver for Realtek's rtl8188cus (WiFi USB dongle), but couldn't find any datasheet or any kind of how-to... I contacted RealTek but they don't seem to respond. Any advice ?
2
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1answer
1k views

iPad Doc connector: is it possible to using the camera connection kit while charging the ipad

I'm building a touch screen kiosk using an iPad and a USB BarCode Scanner (through the camera connection kit). the problem: The pinout here shows the USB pin that the scanner would connect to. ...
7
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6answers
4k views

Is it possible to make a USB device that would alter mouse data on the fly?

I have a friend who is struggling to find mouse drivers/manufacturers that support various options for dyslexia. Inverting the X and Y axes are a simple feature that most programs and drivers are ...
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3answers
11k views

Could a USB wifi dongle be used as an Arduino Wifi module?

I have seen many arduino compatible wifi modules that are rather expensive compared to some other types of modules. I am wondering what is the feasibility of using a consumer grade wifi usb dongle as ...
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4answers
408 views

Tips when choosing relays

I need to control 3 devices, via three relays. I wish to use a 4-relay/usb controller to do this. I currently use this device but I now need three relays: http://www.barix.com/Barionet_100/511/ My ...
17
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6answers
2k views

USB B, mini B, or micro B for product design

I'm trying to decide which connector I should use for a USB peripheral I'm designing. Is there a guide for choosing one? The device is a portable electronic scoreboard that's 16"x10"x1". It will be ...
5
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1answer
770 views

Serial data transfer from Omega DP80 legacy hardware to computer

Can anyone provide me with some guidance on setting up a legacy serial connection on an Omega (brand) thermocouple display? I would like to use the serial data interface (Omega DP80-Ser) to reliably ...
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3answers
21k views

FT232R eeprom problem .. how to make PC recognize it

it's my first time to use FT232R .. when i connected it to the USB for the first time .. my Windows recognized it well, and its drivers were successfully installed .. and even after programming it ...
10
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3answers
5k views

Reading a Micron 29F32G08QAA NAND Flash IC

It would be nice if this was a shopping question - but it is 99%+ likely to be an electronic construction question :-(. I wish to find the quickest / easiest / cheapest way to read a 4GB NAND Flash ...
13
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2answers
3k views

RS232 vs USB CDC quality of service / should messages contain a checksum?

Does USB have a quality of service guarantee for data sent between my USB-CDC device and the USB host? I know with traditional RS232 in a noisy situation (e.g. automotive diagnostic port) bad bits ...
4
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4answers
7k views

USB: what are the advantages (or disadvantages) or using HID over serial-over-USB?

Disclaimer: I'm a novice at electronics and even more so to working with USB, please bear with me if I misunderstand some of the essentials behind how USB works. Any correction welcome! The scenario: ...
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2answers
1k views

What type of USB Protocol for Datalogger

I am attempting to create a USB datalogger and would like to first start with creating a program that transmits Hello World over USB not using some kind of CDC communication. I am trying to figure ...
1
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1answer
2k views

USB barcode scanner and Arduino

I have a USB barcode scanner and I have difficulty getting the data out of it. What I did was to get one of these adapters, and followed this tutorial with no luck. When I connect the ports as shown, ...
6
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4answers
7k views

Is it possible to use a Microchip PIC32 as a USB host and device at the same time?

I'm designing a system and maybe (if I don't find better alternatives) I will need to use a PIC32 as a handler in between two USB devices and a host. My plan is to use the PIC32 to hide the devices, ...
1
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1answer
204 views

USB-device on SAM3-H256 - advice?

I want to build a device which should act as a USB keyboard. I've found a SAM3-H256 board to be fairly easily available in my country. I want the device to be: fully USB-powered (no additional power ...
23
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2answers
3k views

How do I make the Fairchild FSA9280/FSA9480/FSA880 BOOT pin trigger? (Samsung Galaxy S)

this is a bit of a long shot but I'm hoping someone has access to the full data sheet for one of the chips listed in the title, and can tell me what combination of VBUS_IN and resistors on ID_CON will ...
10
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3answers
10k views

Stability of USB +5V output

So i am designing a device that is supposed to connect to the PC via USB and draw power from the VBUS (+5v) of the USB. I am wondering if I need to put a voltage regulator in between the +5v from ...
4
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5answers
3k views

Weird Toyota Prius and USB behavior

My brother in law bought a Prius recently. He's experiencing something strange with his iPod. If he has his iPod plugged in via the USB cable to the Prius, everytime he starts up his car, it resets ...
4
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2answers
2k views

Arduino programming on Uno fails using USB download on Windows 2000

I have a number of W2K systems that we are trying to use to program the new Arduino Uno and Mega devices. These boards now come with a USB connection, an upgrade from the prior FTDI. I'm not able to ...
19
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3answers
15k views

How to limit inrush current?

I'm designing a device powered from USB. The device uses FTDI FT2232 chip for USB connection. Upon a command from a computer FT2232 chip should enable power via a MOSFET switch to rest of the circuit. ...
84
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10answers
146k views

How to get more than 100mA from a USB port

I heard that the current limit for a USB port is 100mA. However, I also heard that some devices can get up to 1.8A from a port. How do you get past the 100mA limit?
6
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2answers
938 views

Dual Role USB device on AVR

Is it possible to run both USB Host and USB Device controllers on top of an AVR (ATMega64)? Specifically, what I'm looking for is to receive data from a usb keyboard, and simultaneously sending ...