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Questions tagged [usb]

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

2
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4answers
154 views

Is the USB B connector still standard?

Nowadays, There are several kinds of USB connectors for USB connection. A type B type micro-B mini-B USB C Etc. The connector sizes are gradually smaller than before. It is a big advantage because ...
4
votes
4answers
4k views

Why doesn't my computer USB port break when I plug in a 2A device?

For typical AC to DC power adapters, I understand that the device draws the current it needs from the adapter. If it pulls more than the adapter can supply, this can cause overheating and lead to ...
-1
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0answers
29 views

Can I get a link to download the HID Descriptor Tool [closed]

The link for the HID Descriptor tool is down! I am in need of this tool ASAP. Would someone be able to provide me a link to download the tool? Maybe it is something on my end by here is the link to ...
1
vote
2answers
52 views

What are the limitations of the USB Composite device

I am looking at coding a USB device that is capable of encapsulating two USB devices. I would like to create a HID keyboard with a single extra USB port. A mass storage device would be connected to ...
2
votes
1answer
62 views

What to do with USB 3.0 ID pin?

I'm working on a simple front I/O board that connects to a PC motherboard. There is a standard connector in the "Intel Internal Connector And Cable Specification" that give a pin-out table of the ...
-1
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2answers
59 views

How to have USB act as a programmable power source? [closed]

I am interested in making a USB device that on 1 end, is a male usb that plugs into a PC like windows. On the other end is something that has a positive and negative terminal (or wire end). I want to ...
1
vote
1answer
97 views

USB shield for analog and digital ground?

I'm new to Mixed-signal design and I'm having trouble deciding how to connect my digital and analog ground. I'm doing a 4 layer design, so I have a split ground plane. As I understand, since I'm ...
1
vote
1answer
68 views

Reusing old laptops webcams to USB [closed]

I am trying to reuse two old webcams from old laptops and convert them to USB, but I cannot get the connections right. From reading other posts, I found out that the cams might not be USB compatible, ...
0
votes
1answer
86 views

2 Computers 1 USB Device (circuit help) [closed]

I have a project with a custom USB device that pumps out a stream of data every 1.125 seconds to a Raspberry Pi running Windows 10 IoT, and occasionally receives an 8-byte command. The USB device and ...
-2
votes
1answer
42 views

Cheap USB controlled DC voltage [closed]

Right now I'm using National Instruments DAQ boards, but I need to put together a few devices that require software control of a DC voltage in the 0-5v range. Update rate can be less than 1 Hz and 8 ...
1
vote
1answer
38 views

Optimal USB full speed ESD conditioning

Is a scheme like the one below better than the one listed above for meeting USB eye diagram specs for USB full speed? I'd imagine that ditching the capacitors would be a good idea.
0
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0answers
11 views

CSR8510 programming

I am working on a project where we need to develop a bluetooth keyboard. The keyboard itself is implemented using the nRF52832 microcontroller. We now are working on the usb bluetooth dongle ...
0
votes
1answer
47 views

In USB 2.0, what's the maximum delay between SETUP and DATA0 packets?

In the setup stage of a USB control transfer, the host sends both the SETUP and the DATA0 packets. Assuming that the device has received the SETUP packet, how long should it wait for the DATA0 packet? ...
0
votes
1answer
56 views

Can nRF52 simultaneously use Bluetooth and act as USB HID Keyboard?

I want to ask something related to the use of the nRF52 as a HID keyboard (USB host). I have already played around with the SDK example ble_app_hids_keyboard and tried to understand it as much as I ...
0
votes
0answers
39 views

Usb micro b 19V and 2.1A safe?

Is it safe to run 19V and 2.1A DC through a usb micro b with no arking and little heat. I know that usb can handle 5v and 2.1A but with the extra voltage can it handle this and not short.
2
votes
2answers
52 views

Calculating the frequency of data lines?

I read a calculation about determining the bandwidth of USB https://www.edn.com/electronics-blogs/all-aboard-/4425691/Rule-of-Thumb--2--Signal-bandwidth-from-clock-frequency Roughly what was said is: ...
0
votes
1answer
76 views

USB Broken problem

I have a problem with a device that I’ve built: It contains a LPC4300 microcontroller and it's supplied with 24V DC. I’ve noticed a strange problem when I connect it to a USB port. The device is used ...
0
votes
0answers
39 views

speed up USB VCP

How I can speed data transfer over USB VCP? I have h743zi-nucleo board. I have already set CDC_DATA_FS_MAX_PACKET_SIZE to 256. Is there any other room for making this thing faster? What can I do on PC ...
0
votes
3answers
53 views

Replace 3.5 mm AUX with USB

This might be a touchy subject, but bear with me. I have a 2.1 speaker set which has typical 3.5 mm AUX input and output. The problem is that sometimes the left and/or right audio channels cut out and ...
-1
votes
3answers
146 views

Change laptop 5.5mm barrel connector [closed]

I'm looking to replace the female 5.5mm barrel jack connector on my laptop with a female USB C connector. The replacement USB C port need only provide power and nothing further. I'm not sure how to go ...
0
votes
0answers
23 views

can't figure out why my micronucleus/V-USB setup doesn't work

I built a small attiny85-based board using vusb and essentially the schematic of the discontinued Sparkfun "AVR Stick" (at least on the usb/uC side; see https://www.sparkfun.com/datasheets/Widgets/AVR-...
-1
votes
3answers
228 views

Efficient way to selectively unpower USB ports

(Edited and expanded from original question for clarity) USB interfaces as a means of controlling external hardware from a desktop or laptop computer are ubiquitous; many thousands of hardware models ...
0
votes
1answer
47 views

Can i use a 220v power strip with usb ports on 110v? [closed]

My local power is 220v and i have a power strip that i bought locally. I'm travelling to a country that uses 110v and i wish to bring the power strip there. Is it safe to use my power strip there? ...
0
votes
2answers
60 views

joining up the USB outputs of a single phone charger to increase/amalgamate current capacity

Is there any problem with joining up the two USB outputs of a single 5V phone charger to increase/amalgamate the current capacity for several small varying loads? I have this device: https://www....
0
votes
0answers
32 views

USB 2.0 voltage check [on hold]

I am trying to repair a Gamepad which doesn't work 100% properly anymore. As I connect the usb to the PC, this one says that the device isn't recognized. I have started the troubleshooting checking ...
0
votes
1answer
37 views

USB interface while running micro at 2.5V

I'm doing a layout for someone who has asked for a USB interface on a micro that is running at 2.5V. As far as I can tell after researching this, you can't run USB down to 2.5V. So, I did a bit of ...
8
votes
3answers
1k views

What equipment do I need to test an eye diagram for USB?

I'd like to test USB full speed with a goal of testing high speed (480 Mbit/s), I have a tek scope that does 300 MHz (which I could upgrade to 500 MHz) and I'm looking at a 500 MHz differential probe. ...
0
votes
2answers
48 views

Using of USB Cables for charging from adapter

Can a USB cable to deliver 2A current or 10Watts(2A×5V) power to a load especially in the case of mobile phone charging? Are the USB Cables available in market with different ratings? Is there any ...
0
votes
0answers
24 views

How to use rn42 bluetooth module with dualshock 3

I have a rn42 Bluetooth module with HID features, now how do I use it to connect to a dualshock 3 or 4 controller with an arduino. Since the dualshock 3 pairs only to a particular mac address, how to ...
0
votes
3answers
111 views

I'm planning to put lots of phone chargers on one circuit, how to calculate this

This would be primarily for samsung S7 devices. Would like to be able to charge, say, 256 of them. They will work in groups of 16, trying to design the power flow of this. Was imagining that each ...
0
votes
2answers
61 views

Is it possible to blink an LED with just a USB data cable and a transistor?

Sorry if this is a dumb question, I am new to electronics and was looking at diagrams of USB cables and wondered, "Could you use the low voltage data wires on a usb and a MOSFET or something to ...
0
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0answers
16 views

USB OTG power circuit viability

I am designing a device with USB OTG that has some power-hungry components that should run only from an external supply, but the device still should be configurable from a PC via USB. I have come up ...
0
votes
1answer
51 views

How can I connect a USB keyboard to a DE1-SoC?

I recently got a DE1-SoC development board from Intel and I wanted to use it to instantiate a computer design I created while following along the Nand2Tetris course on Coursera. Unfortunately, this ...
0
votes
1answer
56 views

How can I power a USB cord from a 12v 2a power supply?

I'm new to the forums and have a problem I cannot find an answer to. I am making a lamp with LED strips inside powered by a 12v 2a power supply. I want to also power a USB cord with this power ...
-1
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1answer
59 views

How to use two USB power banks

I want to use two USB power banks for a camera to get longer battery life. Was thinking when the first one is drained, I would have a relay switching over to the other bank, using a comparator for ...
2
votes
0answers
59 views

Is there any standard (or even a de-facto standard) for TRRS to USB? [duplicate]

I've had a few MP3 players that used a single 3.5mm TRRS jack for both connection to earphones and for connection to a USB port (for transferring music files and re-charging the player.) To that end, ...
1
vote
0answers
21 views

Controlling GL646USB GPIO pins

I have this USB scanner from my dad that was made back in 2002, that apparently uses an old all-in-one GL646USB chip from Genesys to control the stepper motor, CCD sensor and provide some GPIO pins. ...
2
votes
1answer
116 views

Replacing USB-A with USB-C fails [closed]

What I did, step by step: Cut off the USB-A cable from a device. (smart card reader) Cut a USB-C to USB-A cable in half. (cable came with a phone) Soldered the USB-C part (see step 2) to the device (...
-1
votes
2answers
105 views

Extend USB ports on a smart phone

I want to connect a microcontroller to my smartphone through its(smartphone) only available micro USB port, and at the same time enable charging and data sync capability of the phone with the PC or ...
4
votes
3answers
2k views

How to transfer energy generated from electromagnetic induction to a USB port?

For a school project, I'm creating a shake-powered phone power bank that will generate current similarly to a Faraday flashlight, which will in turn power a usb port. A simple enough concept. Now to ...
0
votes
2answers
83 views

USB type-B sockets vs USB Mini-B sockets [closed]

Most Programmers hardware equipped with USB type-B connectors for connecting to PC. USB Mini-B connectors are much less used in device programmers. Have the USB type-B connectors any advantages or ...
2
votes
2answers
79 views

How to jumper differential pair wires for USB 3.0 Superspeed?

Building a USB 2.0 speed cable is almost trivial. Simply connecting D+ and D- through any sort of wiring seems to allow full 480 MBps speeds. Now I want to jumper a USB-C connector to a USB3.0 Type-A ...
1
vote
1answer
67 views

5V Tolerant Way To Generate Rising Edge Signal on USB Connection

I have a microcontroller device that can be awakened from deep sleep mode when it detects a rising edge signal on a wakeup pin. The wakeup pin is 5V tolerant and I'd like a connection to a USB port to ...
1
vote
2answers
47 views

DIY Android Auto Power Booster

first time using StackExchange so please be gentle (and pardon my ignorance with wiring and USB standards). I'm trying to create a USB power booster that allows Android Auto to function over my car's ...
0
votes
0answers
33 views

RFID Key Fob Reader SIEMENS From Car 12 Volt to USB

I'am trying to transform an Rfid reader from Car to usb. From the wiring Page 77 on Renault-Megane-II-Service-Manual I can identify the power wire 2 and ground wire 4 and I know the reader receive a ...
0
votes
0answers
67 views

How do I need to configure USB_FS in STM32H7 to use it as virtual serial port?

I have h743zi-nucleo board and I'm trying to configure USB_FS to use it as COM port. What I do now: In cubeMX: What I do now: Initialize all peripheral in Default mode (this is the dialogue option) ...
2
votes
1answer
71 views

Atmel Chip not recognized as USB device. How to troubleshoot

I've soldered the AT90USB1286 Chip on a PCB like on this circuit: Imgur If I measure the pins, caps, resistors etc. with a multimeter, everything seems to be powered and fine. Reset button pulls to ...
4
votes
3answers
571 views

How to test for USB dropouts on STM32F?

I've got a devices that is really strange, it drops USB periodically. By periodically I mean on a weekly (or biweekly) basis. By dropping out I mean windows loses the handle to the driver. Dropouts a ...
0
votes
0answers
62 views

CP2102 Disconnect when spark probe firing

I'm currently creating an inhouse programming cable for use with a Honeywell S4965. My current setup is a CP2102 chipset for USB to UART which I use with Honeywells programming software. The wiring ...
0
votes
1answer
35 views

Designing a 2S Li-ion charger with 5V 2A input

I'm interested in designing a few similar charging circuits based on the specs of the title which is getting a charging for 2 cells in series(or more) from a 5V input. Now my question is: Assuming I ...