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

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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 ...
-2
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1answer
31 views

Micro USB library for Eagle

I searched the major library sources but all I can find is mini USB library, can anyone share a micro USB library please? PS: I know how to design library for Eagle. If I can't find it, I will do it ...
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0answers
24 views

Is it possible to charge an android phone while it is on usb master mode? [on hold]

I own a Samsung Galaxy S4 and I want it to be charged at the same time it is connected to a USB hub as master (and the USB hub as slave). In a more practical way: I want to connect many peripherals ...
-2
votes
0answers
62 views

communicate with power supply using python [on hold]

We have got RIGOL DP832A in the lab and our task is to communicate it with same using python like to switch it on and off etc etc. can anyone tell me how should I approach to this one? We have to ...
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2answers
48 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, ...
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1answer
22 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
86 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
55 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 ...
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1answer
59 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 ...
5
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2answers
290 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
100 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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1answer
45 views

Feeling strong “static electricity” on external harddisk USB cable? [closed]

Whenever I connect my Seagate 2TB external harddisk to the power through its original transformer, I can feel something special at metal connector of the USB cable (which is used to connect to the ...
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2answers
77 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 ...
0
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0answers
40 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
26 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
votes
1answer
61 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
votes
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 ...
0
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0answers
8 views

arduino serial port programming [migrated]

I bought an arduino-on-breadboard kit. I have several pc with serial ports, now I'm being told I need a usb to serial converter? I thought I was ready to start uploading sketches, please advise. I'm ...
0
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1answer
38 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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0answers
57 views

How come all USB cables are not equivalent? [migrated]

It appears that not all USB cables (one end: USB, the other end - Micro-USB) are created equal: some can only charge devices (e.g., cell phones, e-readers), others can also sync them. Are there just ...
1
vote
1answer
74 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
43 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
34 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 ...
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0answers
40 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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3answers
70 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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0answers
4 views

Computer not detecting my Arduino MEGA 2560 R3 [migrated]

I've tried different USB cables, computers, ports and none of them can detect my possibly bricked Mega 2560 R3. Nothing shows up at all in the Device Manager, not even "Unknown Device". When the ...
0
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1answer
40 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?
0
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1answer
85 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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0answers
13 views

Can a UPC scanner talk to two POS systems at once? [migrated]

Is it possible to make a UPC (barcode) scanner talk to two POS systems independently and simultaneously, so when an item is scanned, the devise will send information to two different, non-integrated ...
2
votes
2answers
96 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
43 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
62 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
47 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
65 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
64 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
46 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 ...
1
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3answers
124 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
88 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
101 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
244 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 ...
1
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0answers
42 views

How to setup a usb Host device

How can i setup a usb host device with pic32MX795 with a pendrive as a device . I have been able to detect the pendrive and enumerate it partially , but cannot create a file on the pendrive . I am ...
4
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1answer
73 views

What is the ideal way to handle data pins D+ and D- on a USB power adapter to be compatible with fast charging on devices?

I have found that many USB wall chargers use a resistive voltage divider to set the D+ and D- pins to a specific voltage, usually between 2 and 3 volts. Other USB wall chargers short the D+ and D- ...
0
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1answer
66 views

Is an USB-to-UART converter different from an USB-to-RS232 converter? [duplicate]

I have a USB-to-RS232 converter. The GND, TX and Rx pins of the RS232 I connect to GND, Rx and Tx on a development board I have. I've set the right baud rate, flow control and other settings in my ...
3
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3answers
174 views

Why would the output voltage of a 5V SMPS (USB charger) increase with load?

I've been using a USB voltage/current measurement device to evaluate power consumption of USB devices and performance of USB chargers and batteries. Most of the USB power supplies I've used are ...
2
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1answer
51 views

USB Interrupt and Isochronous transfer bandwidth concept

I read in the USB spec and other USB materials on the web that interrupt transfer mechanisms (for devices like mice/keyboard) are guaranteed a 'bounded latency'. Whereas the isochronous transfers ...
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0answers
29 views

USB host bulk endpoint setup

Using PIC32MX795F512L as host , for MSD class trying to connect to a pen drive using MLA code , the enumeration is complete , but bulk transfer doesnt work .Cannot read the sector size . I faced ...
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1answer
33 views

USB max devices for host and hub

I am new to USB. I am studying the USB in a Nutshell Guide and the relevant parts of the USB2.0 spec. As per what I have read, a max of 127 devices can be connected to a single bus. As only one host ...
0
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1answer
69 views

Good volts and amps but phone still charging slowly

I am really new to the EE game and am still tinkering. I have built my own portable DC power source similar to a Minty Boost from scratch and plugged it into the USB port of my Galaxy S3 and it ...
1
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1answer
53 views

UM232H-B Breakout Module as a parallel port

I want to build something like UM232H-B Breakout Module. This configuration uses an FT232H, to convert usb to serial/parallel. I don't know whether it works with FPGA parallel port programming cable ...
0
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2answers
88 views

I want to send data to seven segment display without micro-controller

I'm new to embedded systems I want to send data to seven segment display from my pc could i connect the seven segment display to my pc via serial or usb port or i have to use a micro-controller ...