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

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1answer
30 views

USB 3.0 power levels on USB 2.0 device

Is it possible to negotiate a USB 3 power level, such as 900 mA, if the device is connected to a USB 3 port, without being a device capable of the higher speeds? I'd like to use this higher level if ...
0
votes
1answer
29 views

Can anyone understand why my USB 1.1 full speed HUB not work, electronic issue

Our USB ports design include one USB transiever(STOTG04EQTR) and USB HUB(TUSB2036VF).The circuit drawing as below But even the USB1.1 doesn't work. I tested the data line , the waveform really bad ...
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votes
0answers
32 views

Headphones bug (questionmark)

I know this doesnt really fit this forum, but I couldnt find another. I have a USB headset. Yesterday everything was working perfect, but today its not working! When I open the "sound device ...
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2answers
65 views

Detect if usb device is connected on the other side of the cable

Is it possible to detect that there is a device connected on the other side of the cable without using any current sensor? I simply want my arduino to do something when i plug my phone to charger. I ...
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2answers
55 views

Is it OK to use the USB 5v pin as power source?

I am doing some stuff in my case and I need a power source for one LED from inside my case. I looked up and there are two +5v pins on a USB header inside my case. Is it OK to use them as power ...
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0answers
80 views

Is USB charging such a hard problem? [on hold]

Is (universal) USB charging still a hard problem? I appreciate that USB negotiation is needed, but don't all devices comply with the USB protocol? I'm looking at a specific USB charger's compatible ...
-1
votes
1answer
62 views

Portable 1A battery phone charger

I want to make a little battery-powered portable phone charger with 2x AAs that outputs 1A. I have seen similar USB powered battery chargers such as the Mintyboost but it only outputs 500mA. For 1A ...
1
vote
1answer
41 views

What's the requirement to DIY PD aware USB connector?

According to some research, I should be able to pull +12v from a USB power source assuming my device is some how telling the power source that it is ready to receive +12v? I've seen a YouTube clip ...
0
votes
1answer
57 views

make a device for USB ejection

I want to make a device for USB which is connected through usb to PC and offers an usb port. The device should have a button which ejects (in Windows) the device plugged at the port of the device. ...
0
votes
1answer
17 views

Waveshare USB3300 board with stm32f429

I am trying to hook up the Waveshare USB3300 (http://www.wvshare.com/product/USB3300-USB-HS-Board.htm) to a stm32f429 discovery board. I have been having an issue getting it to work. It has two pins ...
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1answer
38 views

AtTiny84 with USB

I am having some problems with the ATTiny84 and USB. I am creating an "arduino clone" but I want a simple (and especially compact on the board) way to implement a USB serial interface. This will only ...
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0answers
34 views

How can I know if this USB hub can be supplied separately?

I have this usb hub: It's originally from a laptop cooler, but I'm using it for my project (DIY tablet). This hub has 2 plugs for the fans (I don't use them) and a principal plug (the big one) with ...
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2answers
77 views

What do I need to create a USB interface between a PC and a board? [on hold]

I am making a custom camera that will be interfaced through the USB port to the computer. Currently, the board contains all necessary circuitry to drive the image sensor. It outputs a parallel stream ...
1
vote
1answer
43 views

How do i turn multiple usb ports off based on multiple sensors

I'm looking for a way to turn a usb port on an off from an Arduino, I'm looking at purchasing something like this and somehow using a pressure or light sensor to turn the usb port on and off. I was ...
0
votes
1answer
49 views

USB data serial termination resistors. Need them for STM32F2 micro? If so, what wattage?

I'm a little confused. The STM32F2 datasheet says only this, vaguely stated in the features: HNP/SNP/IP inside (no need for any external resistor) Is that referring to the D+/D- termination ...
0
votes
1answer
28 views

Supplying two mutually exclusive boards with one power supply in parallel?

I'm putting together a wireless Qi charger for my car that covers a square section of my dash, so where ever I put my phone, I have a connection. For it to work, I need six coils. There are prebuit ...
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votes
0answers
50 views

Charging Samsung devices at 2A rate

I have build a custom USB charger for my phone and tablet that are Samsung products. I am struggling with the solution to fast charging for the Samsung tablet. I can not find any confirmed solution ...
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votes
2answers
65 views

What is the maximum Power that Smartphones charge with? 2400mAh? [closed]

I have seen chargers rated at up to 2400mA, so I wonder, whats the max that Smartphones will accept while charging? I ask because I want to buy a charger that is able to supply the absolute max my ...
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2answers
49 views

How to redirect USB output?

I want to connect 2 PCBs to the same USB cable switch so I can choose wich one is powered. What component should I use for the Switch? Is this possible? ...
-1
votes
1answer
33 views

oDevice to measure power available from charging point [closed]

When charging, I know that USB socket that you plug your microUSB cable into will charge your device at SOME rate. But that rate varies wildly, depending on the original source of the power (high ...
0
votes
1answer
64 views

Name of the Samsung Galaxy end of charger [closed]

This is probably a weird question to ask but I am looking for the end "jack" of the Samsung Galaxy S3, S4 etc charger name. Is not the USB side of the cable, is the actual bit which goes inside the ...
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vote
3answers
97 views

Using a 5V Optical Mouse USB Cable to Power a toy requiring 4 Size D batteries

I have a baby swing which requires 4 Size D batteries to get power. Here's a picture of such a thing - a human baby goes inside. Googling the information on Size D batteries, I found that 4 Size D ...
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0answers
24 views

How to wire this pn532 board to usb to serial converter?

I want to connect this board: To this Bus 001 Device 003: ID 1a86:7523 QinHeng Electronics HL-340 USB-Serial adapter Which syslog says is ch341-uart converter (with a DB9 connector). On db9 ...
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0answers
8 views

Arduino Serial Monitor shows strange ASCII characters [migrated]

I connected an ArduiMU v3+ via a FTDI-cable to my Mac (OS X 10.10) (latest VC FTDI driver is installed and loaded). Inside the Arduino-software the Serial Monitor (monitoring ...
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1answer
29 views

MAX14578 LDO connection not in use

I want to use MAX14578, I've looked into datasheet (http://datasheets.maximintegrated.com/en/ds/MAX14578AE-MAX14578E.pdf) and found it have an integrated LDO. But I don't need to use this LDO. Since I ...
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0answers
32 views

How to connect USB mini-b pins on a PCB?

I want to design a PCB which contains either PIC24FJ128GA010 or PIC24fj256gb110 (still haven't decided). Now the second contains a USB 2.0 on the go and the first one doesn't. I want to power the ...
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votes
1answer
47 views

Automatic distinction between PC-USB and Wall Adapter-USB

I want to ask if it's possible and an advice on how to make an automatic distinction between an PC-USB port and Wall-USB adapter. I've a battery charger IC (for example ...
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0answers
28 views

Internal Programmable ROM of CP2102 (USB to UART)

I am using CP2102 device (USB to UART) in my project. It has internal programmable ROM t0 configure product ID. I tried in there tool via USB and it works. Now, I want to programming the ROM via my ...
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0answers
46 views

5V USB Input and Output for Battery Charger

I am looking to create a 5V input 5V output storage device (kind of like a portable phone charger) but I am struggling to choose a battery which is suitable. The device will be used for mobile device ...
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votes
1answer
52 views

Battery charged over USB and powering DC motors

I need help with figuring out how to power DC motors in my project. I need to power two 12V DC motors (they are connected in series) that will be controlled with momentary switch. The idea is to have ...
2
votes
2answers
50 views

24V power supply for MCU+USB

I'm designing a home automation controller in college. The system is on 24V (relays and sensors). I'm using TI Cortex M3 MCU and i want to control it over USB. This picture of the system is currently ...
2
votes
1answer
54 views

How to Check if Micro-USB Cable has a Short? [closed]

Is there a way to test if my micro-USB cable has a short? I've got a multimeter. I'm having problems programming an Atmel 328 AVR using USBASP with Avrdude, and I want to make sure that my cable is ...
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votes
2answers
51 views

Transferable USB adapter for a broken flash drive [closed]

A couple of hours ago the USB adapter on my flash drive broke. After seeing if I could fix it easily, decided I couldn't. I wondered whether there was a USB adapter that could easily and simply go ...
1
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1answer
150 views

How should I interpret this USB packet in a human readable way?

Using a wixel (wireless transmitter/receiver with USB capability, "this "wixel" thingy is a general-purpose microcontroller board that includes, among other things, USB, 2 UART's, and a 2.4GHz ...
0
votes
1answer
58 views

USB cable current limit: wire or connector?

I am trying to power a device which requires 5V and 2A through a 5.5mm / 2.1 mm barrel jack connector. SInce I need the device to be portable I am using a battery bank like this: ...
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2answers
99 views

How to light an LED to indicate when a usb port has a plug in it?

I'm looking for a way to light a 3.0v-3.4v 20mA LED to indicate when a usb 2.0 port has a plug in it. The light should only be on when a device is plugged in. My usb 5v line is about 3.2 to 3.3 amps ...
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2answers
149 views

Is this pcb layout good practice?

I saw a PCB with something like this. A trace that connects the four holes on the corners. I assume that they do it to prevent some kind of noise. I am not sure if the connect that trace to GND Also, ...
0
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1answer
46 views

Informations about FT2232H as programmer

I was looking on a EVB that use FT2232H chip to program an SPI ram used in second time to programm another device. My question is, if I copy the circuit that programm this SPI ram and use the same ...
0
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1answer
47 views

Colour coding of wires on USB connector

I am new to circuits and electronics. I was building a portable mobile charger(Battery Bank) an had to connect a USB port. The tutorial I was watching had 2 wires , Red for +ve and White for -ve. The ...
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1answer
69 views

Connect PIC programmer to Linux

I have got a cheap USB PIC programmer but its CD has only drivers for windows is there ans way to work with it on ubuntu 14.04
0
votes
1answer
56 views

“Unable to open parallel port I/O driver” when trying to connect “RS232 to USB” cable on Linux

I have a JDM programmer for pic micro-controllers, but it came with RS232 port. I have bought a "RS232 to USB" cable with its driver for Windows only and I use Xubuntu 14.04 LTS. I have tried ...
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votes
1answer
61 views

How to create a USB-Wall power supply automatic selector [closed]

I need to create an automatic power supply selector that power supply my circuit. Problem is that components of power supply selector need to handle up to 5.5A when powered from external source. When ...
1
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1answer
42 views

USB switching power supply filter

Good afternoon fellow students of life, I have a particular question that relates to the use of a Duracell USB switching power supply as the main supply for a high sensitivity sensor board. Most of ...
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4answers
124 views

Does USB always supply 5.0V

I was wondering about this part of a circuit diagram. I believe the component marked as JP12 is a DC barrel connector, which I thought had three pins. One to detect input, one with V+ and one with ...
0
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0answers
54 views

2S LiPo Charger IC With Built-In Boost (allowing 5V voltage supply)

So before I get to my question, I wanted to give a bit of background info on what I am working with. Basically I have a device which is USB powered. It has an ATMega32u4, and two SN754410 H-Bridge ...
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0answers
38 views

controlling USB game device from AVR

I have this missile launcher. I successfully wrote Python script to handle it from my linux. My next step is to operate it from AVR (Atmega328). Is it possible to control USB device from AVR? It is ...
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2answers
179 views

USB Printer not sending Endpoints

I am working on ARM & based LPC2468 controller interfacing with USB printer.I have successfully configured a Printer and it is working Properly. Now i came across a new printer Manufactured by ...
0
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2answers
98 views

Can I convert my 3.7 volt lithium ion batteries into a usb charging power bank?

I have several high capacity 3.7 volt Li-ion batteries. How might I convert them into a USB charger for my phone? I'm not interested in the most elegant solution, or if this would be less financially ...
0
votes
1answer
37 views

USB and button power on solution

I've a circuit that have one input pin that should go LOW if one of two conditions is accomplished: USB is connected; Button OR Switch is pressed/slided; If USB is connected Button or Switch is ...
0
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2answers
52 views

What is the most physically robust USB connector for PCB?

Of the different types of USB connector that can be fitted to a PCB, which is the most physically robust type?