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

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27 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 ...
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0answers
31 views

Owon VDS1022 USB Oscilloscope 2x 25 MHz 100MS/s [on hold]

I would like to get comments on this USB DSO, found here: http://www.owon.com.hk/products_info.asp?ProID=175#sthash.JLOd6oxf.dpbs I will be using this for home based hobby circuits and small ...
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1answer
33 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 ...
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4answers
302 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 ...
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1answer
43 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 ...
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1answer
58 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 ...
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1answer
58 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 ...
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1answer
34 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 ...
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votes
1answer
59 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 ...
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2answers
81 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 ...
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0answers
35 views

USB Loopback Test [closed]

Are there any products out there on the market or is anyone familiar with any techniques for performing a USB loopback test to measure transmission speed and error rate of a USB-A port? For example, ...
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3answers
417 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?
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1answer
52 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
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1answer
54 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 ...
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0answers
66 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
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1answer
46 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
110 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
42 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 ...
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0answers
7 views

Troubleshooting a port in a USB 2.0 bracket [migrated]

I am currently troubleshooting a single port in a two-port USB 2.0 bracket (example here) that does not work. A USB bracket is a simple device (consisting only of cables and connectors) that connects ...
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2answers
51 views

Connect an ATmega328 to a Raspberry Pi

I've been stuck on this problem for a couple of months now and haven't had much luck finding the exact information that I need. So, I'm currently working on a project to make a handheld raspberry pi, ...
0
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1answer
29 views

Is it possible to connect FT2232D's 3V3OUT pin to VCCIO for USB-JTAG programming?

I want to design a USB-JTAG Programmer with FT2232D. And I want to program Xilinx spartan3 FPGA with it, so I need 3.3 volt logic for VCCIO. Datasheet indicates that FT2232D has an internal regulator ...
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3answers
94 views

How can some USB chargers produce larger total amperage than others?

From a quick survey of wall-mounted USB chargers with more than one USB port, it seems that the total amperage provided, for a given number of ports can vary significantly. For instance, I saw 2-port ...
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1answer
70 views

USB to RF bridge: Kettler Ergorace bike

I own a Kettler Ergorace indoor bike. It's possible to create exercises using the USB interface. When plugged into a PC, it is shown as a virtual com port (SiLabs CP2102) I would like to control it ...
0
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1answer
62 views

What's the easiest way to get fast USB serial communications?

What's the easiest way to get fast USB serial communications from an Atmel SAM microcontroller? I consider fast to be faster than 1 Mb/s. In my previous projects I've used an FTDI module, but I've ...
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2answers
304 views

Why FTDI and not AVR with built-in USB controller?

I made a simple program in Visual C# which communicates with AVR via FT232RL chip. PC <-> FTDI <-> MCU. I am using FTD2XX_NET.dll for direct access to USB Device. I'm wondering, what's the ...
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1answer
111 views

Is it possible to inject USB signals (with power) through Ethernet?

I'm just curious whether it is possible to inject USB through Ethernet in a way like POE does but with the additional data lines USB needs. As per my understanding Ethernet (at least the slower ...
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2answers
82 views

A simple device to remotely alert someone [closed]

We are developing a solution that can remotely alert someone around a relatively small area (around 300 meters). Each user will carry a sort of pager. The server will send an alert to the device. The ...
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0answers
46 views

Is USB UHCI polling-based or interrupt driven?

I've had a discussion with some colleagues whether USB is polling based or interrupt-driven. Some claim USB keyboards involve larger overhead than i.e. PS/2 keyboards due to the requirement of former ...
0
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1answer
37 views

Board or product to drive 15 PWM/analog outputs from USB/serial connection

Ok, Let me explain: I would like to drive 15 analogs (0-12V) signal from my computer (based on user interactions/other not-so-cool stuff). This hardware has to be controlled over USB or Serial port ...
2
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1answer
65 views

Passing USB signal over short SATA cable and connector

I am working on a prototype device and I will have a daughter-board mounted at an odd angle in a custom enclosure. I need to get a USB signal, and a few extra GPIO type wires, over to the board. I ...
17
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2answers
2k views

How does USB Type C handle reverse polarity

The new USB Type C connector doesn't have a physical reverse polarity protection anymore. You can plug it in any way you want on both ends, there is also no A and B end anymore, it's all the same. So ...
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1answer
51 views

Audio bluetooth board. RX and TX?

Looking at a usb bluetooth audio aux device board I saw RX and TX. What are these points for?
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1answer
95 views

USB interface with STM32

I'm experimenting with native USB in STM32. I've not found any "step by step", or a little more well structured tutorial, how to implement CDC or mass storage for example. I've found some examples, ...
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1answer
46 views

UART, USB… on cellular cards

Sierra Wireless and other manufacturer carry cellular cards in a variety of physical interfaces. There are different digital interfaces to hardware like USB, UART, USB OTG, HSIC... Additionally ...
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1answer
39 views

Beagleboard USB Packet sniffer

I had picked up a beagleboard a few weeks ago and had then looked into the USB sniffer project that had been created a while back. (https://gitorious.org/beagleboard-usbsniffer/) I understand that ...
0
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0answers
47 views

Connect two embedded devices with USB host with Ethernet?

I need to connect two microprocessors that only have USB host, not OTG or client. Obviously I would like to connect them as directly and quickly (ie 10's of Mbit up to 100) as possible. A USB to ...
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2answers
90 views

ATmega8 USB programmer

I bought this USB programmer: USBasp USBISP 3.3V / 5V AVR Programmer USB ATMEGA8 . But I can't understand how to connect it. This picture has got 9 circle inputs and 1 square input but all the ...
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1answer
48 views

Does BAFO “BF-810 USB to Serial Adapter (DB9)” supports full serial port?

Does BAFO BF-810 USB to Serial Adapter (DB9) support full serial port (hardware flow control) functionality? If not, how can I test full serial port functionality using serial port only with TX, RX?
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1answer
111 views

Connecting a microcontroller to USB interface

Currently I have the following microcontroller Atmel 89C61RD2 through a max 232 chip to RS232 interface. I would like to have an extra connection to a USB interface also. How can I do that? I would ...
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2answers
104 views

Dealing with USB VBUS on a 3.3v board

I have an STM32 board I am currently designing which is going to use the USB bus for communication and programming. The ground connector on the USB will be tied to the board ground, and the D+ and D- ...
1
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1answer
61 views

PIC18F24K50 vendor-defined USB device using libusb, what is needed?

I'm trying to learn how to communicate with a PIC18F24K50 through USB. I read somewhere that a vendor-defined device plus libusb/Winusb is to be referred over HID and CDC for cross-platform custom USB ...
0
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1answer
79 views

Serial Over IP or USB over IP?

Need to connect remotely to a device using cellular GPRS gateway. Device supports RS-232 and USB. It boils done to two options: 1.- Serial Over TCP/IP (Serial to Ethernet - to GPRS, or Serial to ...
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2answers
67 views

Will using a wallpowered usb cable to power a beaglebone black provide more power than on USB to computer?

I couldn't find anything about this specific situation, but will it work, and are there any side effects that could damage it? Also, will it treat the USB as a computer?
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1answer
71 views

How does USB 3.0 negotiate power states?

I noticed, in another question, a comment regarding USB power states. I know that USB 2.0 negotiated power by tying the D+ and D- lines to specific voltages but I can't seem to find any information ...
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1answer
73 views

how to increase output current? [closed]

I have several car chargers but all have 5v, 500-800mA output current. I want to increase the output current to 1A. So that my cell phone charges quickly. Help me what to change or add component to ...
1
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1answer
55 views

STM32F102 USB Programming

I am currently designing a board for a STM32F102 chip which needs to be able to use the USB bus to transfer data while the chip is running. However I also want to be able to program the chip through ...
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3answers
132 views

Can the power source for a USB device be different from the data source?

I was wondering if the data source (USB Host) for a USB device has to also deliver the power 5V circuit e.g. data and power need to have a common ground. Or can I connect the data lines to the data ...
0
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1answer
92 views

RAW USB data over IP even through WiFi

For very special project I need to transfer data from a USB device to another system remotely as RAW "commands". The source device is something like a security dongle (not exactly but is a good ...
1
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1answer
156 views

SRD-05VDC-SL-C 5V DC relay not working with XY-DJM-5V

I'm just a beginner and need some assistance. below is a diagram of a 4CH reciever which works fine with some leds and it reports 5V positive on Data0 when holding channel 0 on the transmitter. What's ...
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3answers
323 views

Why usb to serial port converter can’t program avr microcontroller?

With a serial port or parallel port in pc programming avr microcontroller is very easy and cheap. Problem is, no modern computer come with serial or parallel port. So, usb to serial converter should ...