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

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1
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0answers
23 views

How to restrict power output to a USB client?

...or, how not to charge my phone when I'm using it as a GSM modem in USB tether mode? I've asked this on Unix&Linux but it seems there's no simple way to do it in software. The problem: In USB ...
0
votes
1answer
17 views

Switchable serial bridge (Bluetooth or USB -> Telemetry)

So I've got a simple serial bridge (wireless telemetry -> bluetooth). Now what I would like to do is to be able to use either USB or bluetooth to access the telemetry module (Not at the same time). ...
0
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0answers
36 views

Three point usb switching

I'm designing a device that have will play mp3 files either from an internal usb flash drive (not physically accessible to end user) or from an usb flash drive plugged on an external usb port Also, ...
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votes
1answer
72 views

Powering circuit from PC's USB port

I am working on a circuit connected to computer with FTDI FT232RL. The circuit have got some op-amps and one MCU. Total power consumption (including FTDI chip) is near by 80 mA /h (at 5V). My ...
2
votes
2answers
63 views

Best way to allocate boot loader memory space in the micro controller

I'm confused about how to allocate boot loader memory space in the pic18 micro controller and spend sometime researching on it and landed up here . I'll put my question : I have a controller whose ...
1
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0answers
43 views

How reliable is a daisy-chained USB bus? What are the risks and how can they be minimised?

Introduction USB has been around for quite a long time now, used extensively even in the automotive, marine and space industries to some extent. However certain communication ways are more reliable ...
0
votes
1answer
77 views

how to add a 5V USB output to the base of a mass produced custom table lamp to add phone and tablet charging capabilities

Hello I am a lighting designer that just released my first table/desk lamp design. I would like to add a USB charging port to the base, so people can light their desk and charge their phone or tablet. ...
2
votes
1answer
33 views

EMI/ESD protection for USB interface?

I'm a student making a simple Arduino-compatible board similar to the Pro Micro and am going to put a USB connector on the board. The schematic in the above link doesn't show any kind of EMI/ESD ...
0
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1answer
37 views

Power MUX for USB and AC adapter

I have a handheld, Li-ion battery powered project involving dual path power input (USB and AC). Initially, the circuit is wired like this: It wasn't before long I found the problem when both USB ...
0
votes
0answers
55 views

Sniff USB cable hardware [closed]

Hi somewhat of a noob but here goes.. I want to sniff the printer cable on my restaurant USB thermal printer so I can do a data dump and analyse it later. The main cable has bi-directional data ...
0
votes
0answers
23 views

Female USB charger in a car [duplicate]

I want to build a charger via USB in my car. I have a female USB but I want to know how to make this. I don't know how USB works for charging. I have also a cigar lighter in my car and a charger. ...
0
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0answers
31 views

Windows Embedded USB Client options

I am a very novice embedded developer and I am trying to develop a commercial product using Windows Embedded Compact and a Toradex Apalis T30 COM. Firstly just excuse me here, I am not a professional ...
0
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0answers
27 views

How to test USB 2.0 HS ULPI PHY through JTAG boundary scan?

To facilitate board testing, I need to test chip-to-chip connectivity between a CPU with a ULPI interface, and a USB 2.0 PHY. My goal is to do the entirety of the test trough the JTAG interface. The ...
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votes
1answer
59 views

I want to learn how to make USB drive [closed]

I would like to learn the process of USB manufacturing. I am a software engineer and have a little idea about embedded C and arduino, but I don't know what EXACTLY I should be using. Please would you ...
0
votes
0answers
28 views

Nested Vector Interrupt between USB interrupt and pin interrupt scheduling

I am making a software SPI for a sensor with stm32f072 microcontroller. I have to display it in PC and am using USB protocol for this. While sending data from sensor to USB is completely alright. But ...
0
votes
0answers
56 views

How to shield a USB device from high EMI

What is the best way to keep a USB device from disconnecting when exposed to a high EMI environment, such as when connected to a high voltage power supply under test? For example, in debugging a ...
0
votes
2answers
48 views

usbOTG can I invert the D+ and D- diff pair? [duplicate]

Can I invert the D+ and D- in a USB OTG connection?, would it work? I know that in some protocols like PCIe you can do it, but Im not sure about usbOTG.
0
votes
2answers
85 views

Can a digital multimeter damage a powered circuit when measuring resistance?

I wanted to make sure my ESD wrist-strap is in working order. So I tested like this: Connected the wrist-strap to household ground (via wall socket). Measured the resistance between the wrist-strap ...
0
votes
4answers
183 views

Which type of USB socket is this? [closed]

I am looking to replace this USB port on a new laptop which snapped inside the connector. I know it is a USB 3.0 socket, but not sure on the exact part number or type of socket. I found this ...
0
votes
1answer
47 views

Both USB and ESC power options

I am working on a flight control board inspired in this Sparkfun board: http://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/RedBoard-v21.pdf It is basically an Arduino UNO with a FTDI chip ...
0
votes
1answer
50 views

USB charging at 4.3 volts

I'm trying to create a charger that knows how to switch between OTG and charging mode. The OTG side is working, and my Samsung S4 goes into charging mode. However, charging is really slow. It even ...
0
votes
2answers
54 views

Current taken from USB by STM32F3 Discovery board?

I am trying to find out what the board draws from the USB supply at max MHz. I really don't want to cut cables if this info is available somewhere already
0
votes
1answer
41 views

speed of USB 3 when connected to several USB 2 devices

I am wondering what is the speed of a USB 3 hub when 2 or more USB 2 are connected to it? to be more specific: Assume that I have a USB 3 device which is connected to say 2 USB camera. Each USB ...
5
votes
1answer
69 views

Why are the USB signal pins always swapped on USB bridges?

So I've been looking around for quite some time for a USB<->UART transceiver that has the pins properly ordered. If you'll look at the picture here, you can see that the pin order of the connector ...
0
votes
1answer
29 views

accessing usb data lines in parallel

I am attempting a project that is a basic usb keyboard logger. I plan on using a PIC32 microcontroller that has built in USB host capabilities to interface to the keyboard. My question is, can i ...
3
votes
2answers
119 views

Why can't I solder to this micro USB adapter?

I cut the head off a micro USB power supply thinking I could improvise a full micro USB cable. I found only Vcc and gnd wires. So, I decided to tear into the connector itself. Inside the connector was ...
0
votes
1answer
87 views

Cheap and easy way to power MCU from Li-Ion, and keep it powered during charging

What is the cheap and easy way of powering MCU from Li-Ion battery, with automatic 3.3V regulator disconnect while charging, to properly charge the battery? I've came up with something like this: Is ...
1
vote
1answer
54 views

How to detect the power source when multiple power sources are available?

I have very little background in electronics, I'm from software background. I'm interested to design a system in which there is an 8-bit micro-controller which should get powered from two different ...
2
votes
0answers
92 views

DC 5V USB to replace AAA-battery source: down converter

I have a portable lithium battery-powered speaker which takes auxiliary sound input from a single AAA-battery powered pocket radio. The speaker includes a USB port for charging source devices: I ...
0
votes
1answer
41 views

Transient current limiting

I have a USB powered system. The system on occasion for a short period of time, needs more than 500mA. I have additional caps that can provide this current. The problem is, despite these caps have ...
2
votes
3answers
125 views

How can I add power to a USB socket?

I have a USB device that perfectly works when it's plugged into a Tower Windows-PC, but doesn't work when it is plugged into an old Linux Laptop. Is there a way to add more power to the USB device? ...
0
votes
3answers
136 views

Why does this big button require 12V DC for an LED?

I'm looking at the Spark Fun Big Dome Push button. The spec on the page (and other places selling it) says that the LED is 12VDC. Does this mean that I need 12V as a minimum? Am I not able to just ...
0
votes
2answers
93 views

How to connect atmega32u4 to USB

I want to use a USB connection with the ATmega32u4, but there are 6 pins in the datasheet (http://www.atmel.com/Images/doc7766.pdf) associated with the USB. I don't know which ones connect to the ...
0
votes
1answer
49 views

DisplayLink LCD Controller [closed]

I want a small portable monitor (7 in) that can connect to my USB drive for power and picture (DisplayLink). I've found some cheap lcd screens, such as ...
1
vote
2answers
49 views

I have a .75 Watt/8 ohm speaker. Do I need to use an amplifier, what specs should I look for?

I salvaged a pair of speaker drivers from USB-powered computer speakers that is .75 Watts/8 ohm per channel (2 channels total, L/R). I want to be able to drive audio through it and have volume ...
2
votes
2answers
172 views

how to implement Ethernet with PIC, PIC18F97J60, PIC32MX(795F512L), ENC624J600, LAN8720A

My project is a data logger board which must mount a PIC of some kind to provide USB and Ethernet as a means to communicating with the board. I can develop this system into two products a low-end ...
0
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2answers
44 views

Wiring design for USB voltage and current tester

With reference to this article USB Voltage and Current Tester, it shows a diagram as follows: May I know if it is the same as the following circuit diagram: This is because according to the ...
0
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2answers
68 views

Noise on power line when charging USB

For the starter: I have build device that use DTMF code to control LED light the device can be both power from USB charger or integrated on the board PoE module. The power is also used to power ...
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votes
1answer
94 views

How to program a msp430 without bootloader or ISP connector?

I'm looking for a way to program a msp430 microcontroller in-circuit and with all the components SMD, including the ISP connector. Could, in this case, USB still be an option?
0
votes
1answer
31 views

uC Datalogger to GUI for dataprocessing

So I looked around electronics.stackexchange for this one and here is where I landed: What type of USB Protocol for Datalogger Basically, I would like to sample a voltage (specifically, from a photo ...
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votes
2answers
65 views

Interface USB to micro controller [closed]

Following thing I want project. micro controller USB interface Ethernet Do I require external USB driver to get USB interface with microcontroller? Is it inbuilt in microcontroller? I am new to ...
0
votes
1answer
71 views

Arduino PC LED strip controller

I have an LED strip being controlled by an Arduino and powered by a molex connector within my PC. I'd like to have my Arduino connected to my computer via USB 24/7, however when I do this, the molex ...
-1
votes
1answer
47 views

Serial connection via 3.5 mm Jack

lately I have been experimenting with the Intel Galileo, the thing is that I can't get the serial connection to work so I can do the "Linux magic". Today I bought this cable and tried to establish a ...
-2
votes
1answer
188 views

Interfacing a USB webcam to an Arduino board

I'm trying to connect a USB webcam to an Arduino board (Intel Galileo), the Galileo is powered by a 400 Mhz processor, has 512 Mb of RAM and 8 Gb of external storage (SD Card). I'm a computer science ...
4
votes
2answers
86 views

USB multiplexer - swap pins?

I want to use the USB 2.0 multiplexer TI TS3USB221ARSER. But on the PCB the D+ and D- pins of one connection are crossed (see attached image). Is it okay to change the D+ and D- pins on all sides of ...
0
votes
0answers
39 views

Can I link Ethernet chips on PCB? [duplicate]

I read up on the Raspberry Pi Compute unit and wanted to link a hand full for networking. Unfortunately, they do not come with native Ethernet, but USB. So I was thinking of linking each compute ...
0
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0answers
55 views

USB port identification by system

I am trying to make a USB charger which charges devices connected to a USB hub. I want to uniquely identify which port the device is connected to and activate the charging circuit for that ...
1
vote
1answer
83 views

Is it possible to program AVR microcontrollers using USB-UART converter instead od USBasp?

Is it possible to program an AVR microcontroller (e.g. Atmega328P) using a USB-UART converter like this one: Instead of a usual USBasp ISP programmer: ? If yes, is the procedure the same as in ...
0
votes
0answers
55 views

Full Speed USB Isolator

Can anyone suggest a way to galvanicaly isolate a USB Full Speed (12Mb/s) signal with a solution height of less than 2mm? Parts like the ADUM3160 (link) and ADUM4160 exist but they are too tall for my ...
0
votes
0answers
56 views

Trying to create a USB dongle with OTG and charging capabilities

I'm trying to create a USB-OTG dongle that can pretty much do this: http://accessories.dell.com/sna/productdetail.aspx?c=us&cs=19&l=en&sku=470-abes That's the Dell Micro USB Dongle for ...