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

learn more… | top users | synonyms

0
votes
1answer
37 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
105 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 ...
1
vote
1answer
45 views

USB current limiter and under/overvoltage protection

I know recent motherboards already provide these, but lately USB ports are also available in many different gizmos (smartphone chargers, TVs, standalone players, etc.), which I am often tempted to use ...
-2
votes
1answer
59 views

Can I read coax signal entering through a coax usb adapter through a program? [on hold]

I want to enter a coax signal through usb to my laptop and be able to read it so as to stream it through the web so that i can read it elsewhere reversly (using another usb coax adapter and take it ...
0
votes
1answer
51 views

ATtiny85. How do I burn a bootloader? What is the process?

I want to use all six I/O pins of an ATtiny85, that means also using the reset pin as an I/O pin, however, I found out that if I disable the RESET pin, I can no longer program the ATtiny using an ISP ...
0
votes
0answers
14 views

What is the difference between USB Mini A and Mini B? [migrated]

I have a bunch of USB A to Mini B cables and a single USB A to Mini A cable. I have lost track of where they come from. The two types both look exactly the same with the USB A side having a white ...
0
votes
1answer
35 views

lm2596 fixed 5 volts(usb) from 12v 10W solar panel

I have got a 10 Watt solar panel & a 10000 mha Battery bank. I plan to use the panel to charge the battery bank. I have a LM2596(variable configuration with pot), I plan to use it to charge my ...
0
votes
0answers
44 views

Noise on audio circuit when powered by USB

I built a simple microphone boost circuit which works well with a 3V coin cell however when I switch to USB to power it (battery removed, of course), there's a bit of noise in the 200Hz to 10KHz ...
0
votes
1answer
13 views

Can I use an Adafruit Trinket as a simple Android peripheral?

I want to control the standby state of an LCD panel through an android media PC. I'm thinking of using a Trinket as a cheap android USB peripheral. Is this possible? Or should I be looking at an FTDI ...
-2
votes
1answer
58 views

Controls for building a 3d Printer [closed]

Assume I'd like to build a 3D Printer. I know there would be many ways but I am looking for one that does not need an enormous amount of effort. Not that I am lazy, it's more about reliability. What ...
2
votes
0answers
39 views

USB termination on STM32F437xx

I'm about to layout the USB connection on our boards and wondering whether the termination resistors and pull-up on D+ are necessary when using the STM32F437xx. The datasheet tells: ...
0
votes
1answer
61 views

My take on an automatic source selector between USB and wall supply

This is my take on an automatic source selector between USB and a 12Vdc wall supply. There is something similiar in this post. The problem I have is the Voltage drop across the diode on the USB 5V. ...
0
votes
0answers
30 views

USB analyzer with trigger generation

We're trying to track down a really nasty problem. We have a microcontroller with an embedded USB device controller engine. Every once in a while, the device NAKs an incoming endpoint 0 Set_Report ...
0
votes
1answer
34 views

How to get USART and USB-Serial working on the STM32F4Discovery Board?

I'm programming a STM32F407VG chip on the STM32F4Discovery board using CooCox CoIDE. I've stitched together a program based on some examples and tutorials I found online to get USART1 through pins ...
0
votes
0answers
29 views

AC to DC converter for 5V USB Charger [duplicate]

I have been looking around to understand how phone chargers can pump out 1-2 Amps of current through the USB port in such a small package. I am sure they do use a transformer for isolation. One of ...
0
votes
0answers
38 views

Custom USB 7 port hub PCB dasiy-chain

I had a schematic laid out for a custom USB 2.0 7-port hub I needed to create for a project of mine. It currently uses Ethernet RJ45 sockets to provide power and data to each hub (2 Ethernet ports for ...
3
votes
1answer
108 views

Floating supply and USB ground

I have a somewhat complex circuit controlled by an Arduino, which is supplied by a self powered USB hub (earth grounded 5V supply). A part of the circuit has to be powered by 12-20V DC. When I plug ...
0
votes
2answers
58 views

FTDI cables confusion

I went to the store and asked for a FTDI cable however, I need a bit of assistance, apparently I didn't properly do my homework before shopping and I ended up with upper pic. I need an FTDI cable to ...
2
votes
1answer
53 views

STM32 USB: detecting connection and disconnection

Using STM32F4 USB Mass Storage Controller example in Device Mode, how do you detect connections and disconnections with a host controller? I tried polling the VBUS pin state yet it could be high from ...
0
votes
0answers
10 views

DIN 5 keyboard to USB? [migrated]

I have an old keyboard with a DIN 5 connector, I noticed that the wiring on a DIN 5 connector is basically identical to the USB based 4 contact wiring. Can I just blindly wire a DIN 5 ( starting from ...
1
vote
0answers
33 views

SPDIF digital audio to I2S to USB controller

I'm looking to take a digital S/PDIF audio signal, decode it as necessary, and send it to a USB controller chip configured as a USB Audio Class device so I have plug-and-play with standard OS-provided ...
0
votes
0answers
21 views

Piranha LED board connected to USB charger [duplicate]

Can I use this Piranha Light board to connect to a 5v power source like a USB charger? Do I need something extra (more than an USB-cable)? And can I connect more boards to the same circuit? (New to ...
11
votes
6answers
2k views

Is it possible to step-up the output of a laptop USB port to 12 watts?

I've got a USB device that requires 12 watts to charge. My laptop appears to output less that that. My question is: Is it possible to step-up the output of a laptop USB port to 12 watts?
0
votes
1answer
51 views

Drain Li-Ion battery by connecting USB +5V and GND

I have a sportswatch which can be connected to a PC via USB for downloading the training information, upgrading the firmware, etc. I have used those features for a year on weekly basis, but since ...
0
votes
1answer
26 views

USB OTG: Possible to perform emulation of slave device on master with drivers recognized?

I'm not exactly sure if this should be under a separate StackExchange topic altogether (programming maybe?), if it is, please move it and sorry for the inconvenience. I'm planning to build a device ...
0
votes
1answer
49 views

Digital Multimeter to RS232 Serial Port or USB - DT830D

I am new to Electronics and doing a hobby project. I want to take some readings and get them on the computer/laptop. I am ok with both RS232 (Serial) or USB (preferred). I have a DT830D Multimeter. I ...
0
votes
2answers
63 views

Can you turn a non-USB audio mixer into a USB mixer?

Ok. Pretty sure this sort of thing isn't possible but hey ho, I have a Behringer Eurorack UB1202 multi-channel mixer. I'm just curious if there is any way way to turn it into a USB ...
0
votes
0answers
18 views

Can I measure provided current/power by measuring voltage over resistor? [migrated]

Background I'm trying to get my scanner (CanoScan LIDE 100, USB 2.0, back says power input 5V/500mA) working with a Raspberry Pi. Whenever I issue a scan command it usually gives me a device I/O ...
0
votes
1answer
35 views

Apple iPod 30pin to micro usb

Not sure if this is off topic. I have an old ipod dock with a 30 pin male connect and I want to switch it out to a male micro usb. So that I can use the dock. I don't want to use an adapter as I want ...
0
votes
2answers
68 views

PIC USB host and device

I have been designing PIC based systems for several years, but this will be the first time that I am involved in a project based on USB communication. I don't exactly know where to start but I have ...
2
votes
1answer
99 views

How does a USB 2.0 Wall Charger negotiate current output?

I'm trying to use a mobile phone charger for my projects, and want a high current output. I have read this, however my measurements show something else. Here is a link to the Battery Charging ...
3
votes
1answer
87 views

Android Microchip Accessory Development Starter kit PIC24F

I have the PIC24F Android Accessory Development Starter Kit from Microchip. I am running Android 4.4.2 on a Samsung Galaxy S4, however I am unable to get the phone to recognize the USB device when ...
0
votes
1answer
52 views

USB Serial Communication for STM32F401C-Discovery using Keil uVision5

I have developed a STM32f401c-disco board using Keil, and next I would want to be able to send data out (say just a "hello" string) via the serial link USB-ed back to my PC and show it (I have ...
2
votes
0answers
52 views

STM32F103: not working USB when I turn on the timer

In my project the USB works, if do not use the timer 2. As soon as I enable the timer, the USB is not defined on the computer with an error -71. I use libopencm3; debian; gcc arm; what is the ...
0
votes
1answer
55 views

USB 2.0 vs USB 2.0 OTG

I am looking for some microcontrollers with USB capabilities and some are said to have USB 2.0 HS Host/Device with PHY others say ...
0
votes
1answer
49 views

UL listing for USB device with battery, detachable cord and transformer

I want to import a device (for resale) that comprises the following components: Wall transformer (already UL listed), USB wire, LED light assembly, rechargeable battery (already listed). The ...
1
vote
4answers
337 views

USB PC Current Limit

USB2.0 specification says a device can draw 500mA. In my new design, I like to build it such that with correct adapter the device can draw 1A. My concern is with equipment out there. I cannot build a ...
1
vote
1answer
86 views

Connecting two USB DP/DM

I use Stm32 and recently upgrading my design. Current product uses built in USB full speed and I do everything via this port. (Fw upgrade, service, other usual use cases). In the new design ...
-4
votes
1answer
69 views

What does those symbols on these wires mean? (USB)

I got this cable while fixing my Microphone (Audio Technica ATR2500-USB). It came from a USB B type connector at the bottom of the mic. Does anyone know what does these symbols on the wire correspond ...
0
votes
1answer
63 views

Power supply for usb devices

I had a question that I was hoping someone could help with. I am building a cluster of raspberry pis to do research on and I decided the best way to power all the nodes was through micro usbs. (I ...
1
vote
1answer
135 views

How to use k150 pic programmer on Linux?

I'm trying to start with PIC microcontrollers. I bought this programmer: http://www.kitsrus.com/pdf/k150v2.pdf and a 16F628A. But I'm not able to use it with my Arch Linux... How can I do that? Thx ...
-2
votes
1answer
61 views

LEDs and buttons - ready made [closed]

We want our first semester students to learn programming and see the results of their exercises on a LED matrix. Unfortunately, we can not start soldering with the guys in the first week, so we are ...
1
vote
2answers
85 views

Can I reasonably expect a USB connection manage a 3.7 Volt 6-8 Watt output at 1.9 Amps or less?

I am thinking about making a 510 Vape eCig mod that runs directly from USB. The cart I would like to attach to the 510 head has a 1.8 ohm resistance atomiser in it and wants to see under 2Amps (or it ...
5
votes
3answers
446 views

Are USB's Data+ and Data− needed when just charging?

Are the data + and − wires in a USB cable needed if you just want to charge something? Also what are the benefits and drawbacks of removing the data + and − wires?
0
votes
1answer
82 views

Designing Flash Memory to USB Mass Storage bridge

I've been scratching my head at this for a while now. I'm trying to build a device that records audio using a VS1053 encoder IC to some sort of SPI flash memory. I want to be able to download the ...
0
votes
2answers
80 views

Convert FTDI USB signal back to serial

I have a data logger with a USB output (FTDI FT232RL) and I'm trying to get the information remotely using a XBee modem, but my problem is that I need to "convert" the USB signal back to serial to ...
1
vote
0answers
98 views

Sending data C# to PIC by using USB

I want to send data, C# to PIC by using USB (UsbLibrary.dll). I am using below codes for sending data; ...
0
votes
1answer
63 views

Is it possible to connect arduino pro with an android phone with a usb cable?

I would like to read some potentiometers into my android phone. Is it possible to connect an arduino (ideally the arduino pro w/ USB-Serial-FTDI) to an android phone*? Other than the software part, ...
2
votes
1answer
174 views

USB 5v power filtering

I am creating a pcb that splits a single USB input into 3 outputs (one with data/power carried, two with just power), and I was wondering what is the best way to reduce noise on the power line as this ...
0
votes
1answer
45 views

Increasing USB 5V current the right way

USB2 is limited to 500mA. If you want more current you need an external PSU to pump in more juice. What would be the proper way to add another 5V PSU to the system? Connect the 5V from the PSU to ...