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

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-1
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0answers
30 views

Android Arduino USB [migrated]

I have a HCL ME U1 tablet. This has a built in USB Type A socket as well as USB Mini Type B socket. I have tested the Type A socket with a standard mouse and it works well. I have also tested it ...
1
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1answer
25 views

Is it possible to program AVR microcontrollers using USB-UART converter instead od USBasp?

Is it possible to program an AVR microcontroller (e.g. Atmega328P) using a USB-UART converter like this one: Instead of a usual USBasp ISP programmer: ? If yes, is the procedure the same as in ...
0
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0answers
52 views

Full Speed USB Isolator

Can anyone suggest a way to galvanicaly isolate a USB Full Speed (12Mb/s) signal with a solution height of less than 2mm? Parts like the ADUM3160 (link) and ADUM4160 exist but they are too tall for my ...
0
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0answers
28 views

Trying to create a USB dongle with OTG and charging capabilities

I'm trying to create a USB-OTG dongle that can pretty much do this: http://accessories.dell.com/sna/productdetail.aspx?c=us&cs=19&l=en&sku=470-abes That's the Dell Micro USB Dongle for ...
2
votes
1answer
99 views

Need help with a vertical mount, male A USB connector

I need to figure out a way to get a Male A USB connector to vertically attach to a PCB. Ideally, we wouldn't use a surface mount right angle connector. Any help would be greatly appreciated! Most ...
3
votes
2answers
117 views

Circuit to disconnect USB

I have a microcontroller with USB Host, and I need to be able to programmatically power-down the USB peripheral. The reason is that I need to power cycle the USB peripheral to reset it (a necessary ...
3
votes
1answer
56 views

Composite HID gamepad descriptor works on Windows but not on Linux

I am building an USB adapter for an old game controller. So far everything is working fine. My HID descriptor looks like this: ...
-2
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1answer
50 views

how to decode a USB signal on a breadboard [closed]

I would like read binary data that is not formatted. Is there any DIP to decode it?
0
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0answers
4 views

Ruined Surface Pro's USB port [migrated]

I bought a second hand Microsoft Surface Pro last saturday, and in only one day I managed to ruin the only USB 3.0 port in the device. I bought a cheap USB 3.0 hub. It didn't work. The HUB had input ...
3
votes
2answers
195 views

Did I choose the correct fuse for my USB powered circuit?

I need to drive a circuit (operational current 150mA) with a USB port. I would like to protect the port with a fuse and from this question I concluded, that what I want is a PTC fuse. Is that the ...
0
votes
1answer
33 views

5v DC 1.0A micro USB device hooked to an 5v DC 2.0A charger [closed]

I've bought an Power Bank rated 5v DC 1.0A in it's input but it's extremely slow to charge via USB port, which provides an maximum of 500mA as i read in internet. I have and outlet USB phone charger ...
2
votes
3answers
223 views

Can differential USB traces be routed relative to Power (not Ground) planes?

I would like to route my USB 2.0 (12MHz) signal on the bottom layer of a 4-layer PCB. However, the edge-coupled microstrips would then be referenced to the power plane, not the ground plane. The ...
2
votes
1answer
45 views

Connecting PC and embedded system via USB

I have embedded system with USB3300 PHY and FPGA, which I have to program as a Link. I want my system to be able to communicate with my PC but I am not sure if I have gathered all information. Here is ...
1
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2answers
63 views

RGB LED powered with USB Questions

I have a project in mind using an RGB LED (here: http://amzn.com/B007RO9X82). I would like it to be powered by USB. Since the LED is rated at 3.0-3.6V, I understand I'd need a resistor. What ...
0
votes
1answer
54 views

Connecting three keytars to the NES [closed]

Let's suppose I have three keytars, such as this model. I want to hook them up to the NES (Nintendo Entertainment System) in some fashion. The NES has a controller port I can use that is wired like ...
1
vote
0answers
28 views

Beaglebone black usb host current

I'm using a Beaglebone black + BBVIEW 4.3 LCD Display + Datalogic Magellan 110i usb scanner. The scanner is connected to the usb host port but when i read a bar code the scanner goes down and then up ...
0
votes
0answers
36 views

USB Busy when transmiting data

WHat should I do when I am sending data using USB, when the callback in my firmware gives me USB BUSY? Once, I received USB Busy state, I could no longer send data to my host from my firmware, but my ...
0
votes
1answer
62 views

How can I tell charge only usb cables from usb data cables

Like most computer hobbyists and programmers, I've amassed boxes of usb cables to connect usb, micro usb, and mini usb to chargers, computers, and gadgets. These cables are a mix of phone charger ...
0
votes
1answer
68 views

Why does USB signaling to microcontrollers need resistors

I'm currently trying to make a USB device with the ATMega16U2. On page 187 of the datasheet, there are unspecified resistors between the USB port and the pins of the microcontroller The Arduino Uno ...
0
votes
1answer
45 views

Connect / disconnect USB while external power source remains connected

I have some arduino mini pro collecting environment data, so they operate a long time collecting and I need to connect Gnd - Rx - Tx once in a while to transfer data to my PC, and then disconnect. I ...
0
votes
0answers
27 views

Atmega 168A fuse programming

I'm currently programming over an Atmega 168A micro controller through a USB Tiny programmer and an ISP interface. The micro controller is set up with an external oscillator and an external person ...
2
votes
1answer
33 views

Series Damping Resistor for Low-Speed USB

The USB 1.1 spec gives well-defined \$V/I\$ characteristics for full-speed output drivers, which can be used to find the series damping resistance, \$R_S\$. The low-speed output schematics also ...
2
votes
2answers
72 views

Is there a USB alternative to Mass Storage which works at the filesystem layer?

Is there a USB alternative to Mass Storage which works at the filesystem layer? The goal is to be make a USB device which is mountable as a filesystem, not a block device. The difference is that ...
1
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2answers
81 views

How to make a simple USB gadget without vendor and product ids'

I would like to control a simple servo or led with USB. I opened the cable up and connecting the red and black wires to the servo made it spin properly with about 5V, as those are VCC and GND. Ok. ...
0
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0answers
4 views

How to connect Arduino Pro Mini with PC? [migrated]

I'm about to buy Arduino Pro Mini (http://arduino.cc/en/Main/ArduinoBoardProMini). As far as I can see it requires FTDI or similar circuit to program it. Should FTDI be present for communication with ...
0
votes
2answers
65 views

How does USB superspeed electrical signaling work?

I've been reading a bunch, including the USB 3.0 spec, and I still don't get it. The transmit data lines are both capacitively coupled, so at the connector, SSTX are 0 V average? Yet the voltage ...
1
vote
0answers
29 views

Placement of ESD protection device on Motherboard and mating daughter PCB for PCB lines in plastic enclosure

I have a motherboard with a USB Hub IC. The USB lines are routed from the motherboard via a connector to a daughter board. This daughter board has the USB connector. The cards are inside a plastic ...
0
votes
0answers
40 views

stm32f0 USB keyboard LED controlling with DataOut or RxReady0 with endpoint 0

I am making a USB keyboard using stm32F0RBT6 micro-controller. I want to receive data from PC for Caps Lock and Scroll Lock leds. Do I need to initiate a callback funtion like those ones? ...
1
vote
2answers
48 views

Making a program that sends data to USB port [closed]

I want to create a program that is able to communicate to the USB port on my laptop. From this program I want to send data to the USB port constantly. Basically something like a hyperterminal, but ...
0
votes
0answers
47 views

Protect the USB supply

How can i protect the USB power line from external power line connections? what's happening when i connect 5V line from external power supply (such switching reg) together with 5V USB power line? I ...
0
votes
1answer
42 views

Un-shielded USB 2.0 Signal Connector

I am working on a project that requires that I transmit USB 2.0 over 0.1' headers due to an old design of a test board that used to use low speed USB. The 0.1' headers are an unshielded and I worry ...
0
votes
1answer
75 views

Can I use an electrolytic capacitor on UCAP?

I have a small board based on the ATmega32u4, which I'm assembling. I only have electrolytic capacitors in 1uF value sitting around. Can I use an electrolytic cap from UVCC to ground, instead of a ...
7
votes
1answer
607 views

What's this component?

What is this component?(U6) Source
1
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1answer
72 views

Why are there so many USB connector types?

Why are there so many different USB connector types? Is it just that they've gotten smaller as Moore's Law progressed and there was a need for smaller connectors, or is there something more?
-1
votes
1answer
69 views

We're making a bike-powered USB charger and we have (almost) no idea what we're doing

So my friend and I are going to build a USB charger powered by a dynamo. Here is a diagram of what we are planning to do. I have a few questions: 1.) How do we test if the dynamo and breadboard ...
5
votes
1answer
90 views

Placing Via's on PCB

I'm designing a PCB for USB 3.0, the specifications for Differential impedance comes at 90 ohms with a tolerance of +- 5 ohms. I've used different calculation tools but when I have to hold these ...
1
vote
2answers
59 views

USB not detected

I am designing an Atmega32U4 based board. The chip has a USB peripheral and I have made provision for that. But, the board is not detected in the device manager. I am attaching an image of the USB ...
0
votes
1answer
58 views

How to connect an 8 module relay with DAQ NI USB 6800?

I have been trying to figure out how to connect a 8 module relay to a DAQ NI USB 6800 device instead of an Arduino or a Raspberry Pi. Could somebody help me figure out the connections?
0
votes
0answers
56 views

Can a USB 5v 0.5A powered pcb sent data to a 3,5 mm jack using a 2nd usb port via usb-to-3,5mm converter wire?

I am designing a MCU for a device that is powered by USB. This device needs to send simple serial commands to an 3.5mm stereo port on a monitor. The wanted to use USB-to-3.5mm jack converter wire, ...
6
votes
2answers
153 views

Is USB-C a technically viable substitute for SATA Express connectors?

SATA Express, the successor to SATA, is too new to be widely used yet, but the advancing speed of SSDs appears to make it inevitable, the same as SATA replaced parallel IDE. Despite the name, it isn't ...
1
vote
1answer
73 views

Does the USB-C Alt Mode specification require support of the USB 3 protocol?

If a device is designed with a USB-C port that's intended for use exclusively in an alt mode such as Displayport or PCIe rather than for use as a general-purpose USB port, then the hardware to support ...
0
votes
1answer
137 views

Can I split a USB cable's male end, add a second male plug, and draw 10V from 2 ports instead of 5V from one port for a single device?

Say I have a device that accepts 10V @ 2A, and I have a wall-wart with two USB plugs that both output 5V @ 2A. Can I add a second male connector, connect both connectors to the wall-wart's two ports, ...
1
vote
2answers
103 views

Switching between USB power and single alkaline battery

I've read the numerous other questions addressing this topic, but I'm not sure if any of them apply to my situation. I am designing a device that will run off a 3.0-3.3V supply voltage and draw no ...
0
votes
0answers
27 views

Advice: how to integrate minipci cards to a board design

I'm designing a pcb card for one embedded device based on a Digi iMX28 module. In the design we included a couple of minipcie sockets to add 3G and wifi cards. However, there are two flavors of ...
1
vote
1answer
49 views

USB - Tolerable voltage drop

For a system I am designing I need go over 500mA limit for a very short time (30mSec). I have designed my system such that during the over 500mA period I am able to sustain my circuits using internal ...
0
votes
1answer
78 views

How can I use a greater USB charge current without device enumeration?

I'm designing a device with USB communications, using an STM32F105 microcontroller. It has a LiPo battery, which charges from the USB port using an LTC4077 charge controller. It will generally use a ...
2
votes
2answers
185 views

Why does Ethernet on UTP have much greater range than other modern protocols?

OCuLink, SATA, USB 3, and Displayport all provide on the order of a few Gbps per signaling pair, and are limited to a cable length of just a couple meters. Ethernet via comparable cabling provides ...
0
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2answers
86 views

Can I run a program, on an ATtiny85 with micronucleus bootloader, without usb connected?

I have managed to put micronucleus bootloader on an ATtiny85. Using it, I can successfully upload programs to my ATtiny through USB and they run as they should, as long as they are connected to USB. ...
0
votes
1answer
58 views

Shielding not connected to USB connector causes tablet restarts

I have a custom USB cable, USB type A male on one end and a DB-9 connector on the other end (only using 4 pins). The shielding of the cable is connected to the USB connector but not the DB-9 ...
2
votes
2answers
182 views

2.5mm Jack to USB data Cable

I was recently diagnosed with Type 1 diabetes. With the need to test my own blood upwards of 8 times a day I have a ton of data to keep track of. My testing unit has the ability to upload its data to ...