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

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0
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0answers
26 views

USB interfacing on MSP430

I'm currently doing a project on MSP430F5638. I want to implement USB on it. I got the code from TI website, but while running this code I am facing some problems. 1.values in ...
0
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2answers
16 views

will dual port usb :20 Watt/ 4.2 Amp (10watt.2.1amp each port) provide enough power [on hold]

im about to get garmin dashcam 20 soon and since it uses your average A-Male to Mini-B cable, i was wondering if i can use my usb car charger i have which has dual ports and i have run out of ...
2
votes
2answers
65 views

Temperature measurement into USB [on hold]

I am trying to get a couple of temperatures into my computer. In my little lab I have about 50 thermistors that look a bit like this NTC-Thermistor. I now would like to get the temperature of all of ...
2
votes
3answers
86 views

Quality of usb-cables [duplicate]

Some suppliers recommend to use the original micro-usb cables for usage with there device. One example is syncing via Samsung Kies. I also exerienced that some devices seem to be realy sensitive to ...
0
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2answers
57 views

Does a USB hub fall under the definition of 'backplane'?

I am just curious if a typical USB hub with a couple ports for devices falls under the definition of a backplane.
0
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0answers
35 views

High speed data from microcontrollers to pc using daisy chain

I have STM32F4 discovery boards. I have 30 such boards supporting maximum data of 128Mbps. The max data at any instance in complete system would be 300Mbps.I need to pick this data and send it to PC. ...
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0answers
3 views

Which components to built remapping keyboard via USB in + out (remapped) [migrated]

I know that it's fairly easy to change the emulate keyboard and mouse by Arduino. But I'm quite specific about the goal I would like to achieve hence I would appreciate if you could advise me which ...
0
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0answers
35 views

USB device to measures mains voltage [closed]

I'm looking for a usb device that I can connect to an outlet and measure the voltage. It doesn't have to have a high sample rate, once a second would be great. Resolution only needs to be about a ...
1
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0answers
22 views

PIC M-Stack “add . to include” confusion

I am experimenting with the open source USB stack called M-Stack for the first time. I decided to start by building the HID mouse sample application, but I had to create my own project configuration ...
0
votes
1answer
48 views

Power ATMEL ATMEGA328P directly from USB

im wondering if it is Ok to power an ATMEGA328P directly from an USB-Poweroutlet i.e. an Apple-USB-Charger. And I mean directy: VCC to Pin 7+20 GND to Pin 8+22 Peripherals should be powered from this ...
0
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0answers
12 views

USB 3.1 Alt-mode standards for PCI Express

Is there a central set of standards for USB 3.1 alt-modes? I have seen standards for DisplayPort and MHL but nothing else yet. Is PCI Express going to have a standard? I have seen suggestions that ...
1
vote
1answer
55 views

How to measure the quality of a USB charging cable?

I have a set of USB cables (data and charge) and I noticed that, for a given charger, the charge time differs by cable. What would be a good way to measure the charging fitness of a USB cable? ...
1
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2answers
62 views

Switching between power supplies - USB dominant

I'm trying to create a data logger. I want the data logger to be able to run in 2 modes. Bench mode (usb powered 5V) Field mode (externally powered 3.3 - 12V) Bench mode is active whenever power ...
1
vote
1answer
48 views

AVR USB to Serial Converter; Quick Question

I have a TI86 calculator that I've had for over 7 years now. Well I'm letting a lady friend on mine borrow it, and I was going to load it up with some apps for her. And the tradeoff is happening this ...
0
votes
1answer
27 views

How do I specify 3 interrupt transfers per microframe in high-speed USB?

I am sending interrupt transfers over USB 2.0 and trying to get the maximum bandwidth possible. According to various documents, they indicate that "the endpoint descriptor may specify up to 3 ...
-2
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0answers
42 views

Difference between FTDI and Prolific serial to USB converter

I am a software programmer but for my project I want to do hardware integration. I am connecting the hardware to my android unit using RS485 <-> USB converter. Can anyone tell me the difference ...
0
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0answers
31 views

CSI/DSI over one meter cabel

Imaging you have a smartphone where the display and the camera is attached with a one meter long cable. What would be the best and most power efficient way to transfer camera (CSI/I2C) and display ...
2
votes
3answers
57 views

What's the best way to add USB support to a project

It just so happened that I need to add a usb communication for my next project that I am working on.What's the best/cheapest way to do this. Should I be using a microcontroller with USB support like ...
0
votes
2answers
52 views

Can USB 3.0 SSTX lines be swapped with SSRX lines

It is given in the USB 3.0 specification that USB super-speed lines support "polarity inversion". That is SSRX_P can be swapped with SSRX_M (or SSTX_M with SSTX_P). ...
1
vote
1answer
24 views

Will the charging current decrease due to a higher input resistance?

I am trying to design a board with USB powered linear battery charger IC charging a 3.7v Li-ion battery. I am concerning about the the relationship between charging path resistance and the maximum ...
0
votes
0answers
49 views

what is the diffrence between hid and cdc usb device?

I was not able to get the difference after much googling.I am a newbie in microcontrollers and doing a project on Temperature controlled fan using LabVIEW and PIC18F4550. I need to know how ...
0
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0answers
51 views

One FTDI on Three Atmega [migrated]

I'm doing a schematic for an arduino project-based and I can not proceed. I'm facing a problem which I have no idea how can I solve it so that's the reason I'm writing back to you. The thing is: I ...
0
votes
1answer
49 views

Turn off device when USB power is present

I have a device I'd like to turn off when power is available via a USB socket. The device that needs to be turned on/off is powered by a 12v DC 0.5 amp adapter. USB sockets should have a max 5v 0.5 ...
1
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0answers
25 views

Creating a switch between USB and USB OTG for phones [duplicate]

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 ...
-1
votes
0answers
24 views

USB controller for USB Communications Device Class (RTL8188SU)

i need a USB host controller that will interface with an RTL8188SU (http://www.realtek.com.tw/products/productsView.aspx?Langid=1&PFid=48&Level=5&Conn=4&ProdID=228), which is a single ...
2
votes
1answer
62 views

how can I hack a usb charger to work with ALL phones and specifications

perhaps I am asking for too much. Please do tell. So I have a few usb chargers laying around. I realised that in these chargers I can charge iPhones and I can ...
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0answers
34 views

PDM or I2S over USB

I have a device that is connected to a computer using USB. In the device I want to put 4 microphones. The captured sound should be transferred to the computer where it will be analyzed, each channel ...
0
votes
1answer
62 views

What is non-micro USB connector? [closed]

I'm reading an article which is about wearable smart watches. To their credit, many of the manufacturers have made charging a non-micro USB charging affair, though Motorola’s Moto 360 is ...
0
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3answers
48 views

Is it possible to run 2 motors independently with USB?

Is it possible to run two motors independently in both directions with usb using no microcontroller but just some discrete components? I'm trying to create the cheapest possible robot that can just ...
1
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0answers
32 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
45 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
votes
1answer
49 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, ...
-2
votes
1answer
86 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
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2answers
88 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
54 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
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1answer
90 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
52 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
49 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
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0answers
25 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
35 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
38 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 ...
-5
votes
1answer
61 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
35 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
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0answers
62 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
52 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
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2answers
103 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
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4answers
184 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
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1answer
56 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
92 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
78 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