USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.
3
votes
1answer
265 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 ...
3
votes
2answers
559 views
Easiest way to create a USB HID device
I am working on hacking an RC remote controller I own. What I intend to do is open it up, and tap into the potentiometers. I want to read the analog values delivered by the potentiometers, and send ...
4
votes
3answers
196 views
Replacing a custom serial port connector with a Micro-USB 2 plug
I currently have a very fragile solution to connect my embedded device to a PC's serial port. This is mounted on the PCB: http://www.digikey.com/product-detail/en/DF13A-6P-1.25H(50)/H3384-ND/530681. ...
2
votes
1answer
359 views
How to connect USB barcode scanner to a PIC?
I've got a bog standard barcode scanner with a USB output and I'm trying to figure out how to connect it to a PIC.
Basically, the idea is that I use the scanner to scan a barcode and the barcode is ...
2
votes
2answers
629 views
USB data sniffing cable
I am looking for a way to sniff the data running between a PC ("A") and a USB device ("B") by using another PC ("C").
To do this, I spliced the cable going from A to B and soldered another USB cable ...
5
votes
4answers
593 views
Connectorless MicroUSB or miniUSB on PCB: Feasible?
This question extends upon "Connectorless USB on a PCB". Our requirements are for a smaller connector than standard USB, and also 5 leads instead of USB 1.0's 4. The connector will be used perhaps ...
2
votes
2answers
648 views
USB-MIDI Interface with STM32F4 Discovery?
I've got an STM32F4 Discovery Board and I'd like to use/configure it as an USBMIDI device but this standard device class is not (fully) supported by the USB libraries supplied by ST.
Any hint? Any ...
2
votes
1answer
149 views
USB I2C adapter and Cognimem on Mac OS X?
I am a newbie when it comes to electronics, but because of some things I'm being exposed to at work, I've grown a bit of an interest. I was given a Cognimem CM1K chip on a board, which is essentially ...
0
votes
2answers
336 views
V-USB with ATtiny2313 to communicate with Android
How would one interface a ATtiny2313 with usb to communicate with a android device? I know it involves using V-USB, but how does the circuitry work? Am I supposed to connect certain pins on the ...
0
votes
1answer
111 views
Static sound when running amplifier and usb charger off same battery [closed]
I am running a 12VDC 2A Lepai amplifier off an 18V Li Ion power tool battery using a 1.5 maxA step down voltage regulator. All was working fine until attempting to add in a 12V to 5V 1000mA USB ...
0
votes
1answer
311 views
charging multiple Android tablets at once (up to 12 units) [closed]
We're having problems charging multiple 7" Android tablets at once through a multi-port USB hub. We have two 7-port USB hubs from Belkin charging 4 Android tablets on each hub. Some seem to be ...
3
votes
1answer
164 views
Circuit explanation, role of the trimpot and capacitor, as shown in a part of the circuit
Here is a part of the IOIO circuit
.
Wondering if someone could explain the role played by the trimpot (R2) there (why not a fixed resistor?) and the role of the capacitor (C5).
3
votes
2answers
1k views
Throttling data from USB serial connection on STM32 microcontroller (flow control)
I've just integrated the code from ST's STM32 USB Virtual Com Port example (stm32_usb-fs-device_lib.zip from here) with my project in order to get the STM32 to appear as a Virtual Serial Port.
...
1
vote
2answers
219 views
How realistic is a 4 ports charging only USB hub mount inside a wall outlet box?
Here's a concept of a wall outlet variation. It's size of a wall outlet (occupies the same size standard box in a wall) but instead of mains outlet it has four USB ports for charging various devices.
...
2
votes
4answers
884 views
What microcontroller can connect directly to a USB port?
Essentially, i just need to send some data to the microcontroller via USB, then the microprocessor decodes the data and drives an LED light strip, which runs at 5 volts. I'm having trouble finding the ...
2
votes
0answers
73 views
USB to detect electrical charges [closed]
How would I go about making a simple board (preferably USB) to detect when electrical current is passing through? This information would have to be routed to, and readable by, a computer.
0
votes
0answers
940 views
USB-to-Serial Cable Based on the Prolific Chip - Windows 7 Driver Problem Fix
This problem drained a few hours for me, and after searching for miles on the Internet, I simply couldn't find the correct solution. The Prolific PL-2303 chip is used extensively for Serial to USB ...
1
vote
2answers
112 views
Removing USB Plugs Daily
I have a Mac Mini and a PC. Every day, I remove the HDMI wire, mouse, and keyboard wires and I connect them to my Mac Mini. I am constantly plugging wires into my USB ports. Will that harm my ...
1
vote
3answers
234 views
Are pull-down resistors included in the mbed USB ports?
For the mbed LPC 1768, I am trying to establish a USB connection with an external device (pins 31, 32, and 39 for D+, D-, and Vbus, respectively). According to USB in a NutShell: Connectors, a 15kΩ ...
3
votes
1answer
712 views
3.3V Power Failover Supply with USB Li-Ion Charger
I am currently designing a "3.3V@500mA Power Failover Supply with Integrated USB Li-Ion Charger" for a uC project. I want the circuit to draw power straight from USB power when available & switch ...
2
votes
1answer
2k views
How to connect together: Raspberry, Arduino, PC PSU, Usb Hub, Usb Hdd - without issues?
A pc psu provides power for:
arduino uno (via de standby 5v power + ground so it always has power)
raspberry pi (via a 5v + ground connection)
usb hub (via a second 5v + ground connection)
...
0
votes
1answer
87 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 ...
1
vote
1answer
143 views
Arduino USB host get raw events
For a project I'm planning, I'd like to be able to plug a USB device into an Arduino and capture the raw usb events (handshake, interrupts, etc) and reply to the device on an equally low level. I've ...
2
votes
1answer
198 views
Control a C program on a PC with external digital/analog inputs
I developed a code in DEV C++ which simulates graphically a the actions of a train driver. Basically I control the speed and some other functions of a train from my keyboard.
Now, instead of the ...
4
votes
1answer
657 views
How critical is the layout of USB data lines / how does my layout look?
I'm laying out the USB data lines on my board at the moment, and I'm just trying to get an idea of how well off my design is gonna fare. Here are the particulars:
4 layer board (from the top: ...
1
vote
1answer
210 views
Risk of overloading a usb charger
I just bought this product: "Jackson PT1USB" as an attemp to get a portable charger for my netbook, ipad 2 and smartphone.
Now I am bit worried after reading in the product "total connected load to ...
5
votes
1answer
110 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 ...
1
vote
3answers
2k views
Is it possible to make a usb charger to power multiple devices?
I was thinking how nice it would be to have a single wall plug with multiple (4-6) USB ports that would be capable of supplying enough power (at 5v) to charge say an iPad, smartphone, bluetooth ...
0
votes
1answer
47 views
usb2 specification - is it backwards compatible
Say I had usb port on my motherboard that only supports low speed devices, will full speed/ high speed devices not work on the low speed ports but at a lower speed?
18
votes
2answers
476 views
Solution for adapting to USB current draw limits?
Summary: I'm setting up a USB-powered Li-ion charging circuit and would of course like to draw the maximum charge current possible situationally -- but also want to ensure I don't violate the USB ...
0
votes
2answers
598 views
USB cable as +5v vcc source [duplicate]
Possible Duplicate:
Powering a breadboard with USB
I was wondering if it is possible to cut open a usb cable, and use its "sub" wires to get its 5v power and gnd.
I am currently doing a ...
2
votes
1answer
160 views
troubleshooting why adum4160 internal reg gives 5v instead of 3.3
The problem I have with my ADuM4160 circuit is that I'm getting 5v from VDD2 pin whilst getting roughly 3.3v on pin VDD1. Have I blown the chip?
It doesn't make sense for the VDD2 to be the same ...
2
votes
2answers
174 views
Can you charge a battery to run a device at 5V from the USB port?
Say you had a device that requires 5VDC to operate. It can actually run safely at about 4.8VDC. It normally runs off of USB power but I would like to rig it up to run off of a battery. Would it be ...
1
vote
3answers
284 views
“USB is also a serial communication method” is this true?
I'll repeat the title. Is it true that USB is also a serial communication method ? (a bit confused, someone told me @ facebook :D)
3
votes
2answers
164 views
Possible to reliably run USB over a non-standard USB cable?
I'm planning on building a device for my car that sits somewhere in the rain tray or behind the dashboard. It will use automotive connectors so that things are sealed, easily connected and ...
4
votes
5answers
422 views
USB micro B receptacle has 6 mounting tabs. How many do I actually need to ground?
This USB micro B has 6 mounting tabs. If I ground none or only 1 of them, will it ruin the signal? There is a pad for the signal ground that is separate from the mounting tabs.
Fyi USB 2.0 has a max ...
0
votes
0answers
168 views
making USB charger but it isn't pushing enough power to the USB ports
I am in the military and trying to use BA-5590s the radio batteries as a power source but when plugged in it isn't pushing enough power. I am thinking of switching the resistors they were 12V chargers ...
5
votes
1answer
210 views
What is a USB transceiver?
I'm in the process of learning how USB works. What is a USB transceiver and how is it different from the PHY logic of a host controller?
1
vote
1answer
399 views
Not getting any reading from FTDI UMFT201XB USB-to-I2C module
I got the FTDI UMFT201XB USB-to-I2C module in order to interface with an I2C peripheral through a USB port on my Windows 7 computer.
The VCP drivers seem to install correctly, and a COM port is ...
3
votes
1answer
392 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
votes
1answer
165 views
Programming to read X-10 over USB or Serial
Does anyone here have experience writing a program that would receive signals from Visonic, or other X10 sensors such as door detectors or motion detectors?
Essentially, I would like to write a ...
3
votes
1answer
1k views
Hello World with Arduino Leonardo
I have a Arduino Leonardo board. and i get an error : avrdude: stk500_getsync(): not in sync: resp: resp=0X54
I have ...
2
votes
1answer
219 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 ...
5
votes
1answer
199 views
What's the easiest way to create a software-controlled 220V electricity interruptor?
As the title says, I'm looking for an easy way to interrupt a 220V electrical cable and to write a software that controls the interruption.
I imagine there are some kind of relays or contactors which ...
1
vote
0answers
107 views
USB HUB Design Query [closed]
I am using an USB Hub in my PCB design. The Hub requires 3.3V & 1.2V power supplies, a reset & a 24MHz clock. I have given powers & reset to the IC.
I am using an external crystal as the ...
7
votes
2answers
656 views
Want a USB mini-microphone array. Is it possible?
I have been learning a lot about adaptive beam-forming, and have been mucking around with various sims in MATLAB, etc.
But what better way to understand something - truly understand it - than to ...
3
votes
1answer
169 views
How to determine USB hub speed type?
I'm developing a driver for multiple USB speeds and according to the universal specification, I'm allowed to draw a greater amount of current from a USB 3.0 hub than the other versions.
Is there a ...
3
votes
1answer
483 views
USB to 3-cell Lipo charger?
I have a data-logger project that needs to run from a 3-cell Lithium Polymer battery. It has 5v and 3.3v regulators to provide regulated power to the system.
I want to build the battery into the ...
-1
votes
1answer
863 views
Micro-B USB male to 2x Micro-B USB female Y splitter adapter [closed]
I'm looking for the above mentioned splitter.
It's like this, but Micro-B USB
and like this, but reverse the male/female.
By the way, I was able to use my Samsung Galaxy S3 phone with the Samsung MHL ...
5
votes
3answers
859 views
A simple on-circuit RS-232 to USB converter
I want to interface a PIC microcontroller (18f452) to a PC via the USB port. I learned that there is a USB class for serial communication so I will not have to write device drivers for it.
I want to ...
