Questions tagged [usb]

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

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chinese wemos d1 board randomly connecting/disconnecting from USB

How can I find out why my wemos D1 mini board is randomly connecting and disconnecting from USB to PC? I got three boards from a chinese retailer. When I plug them in a PC and check device manager, ...
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2answers
115 views

Python to trigger USB square wave pulse for camera

I'm sorry if this was posted somewhere, but I'm trying to trigger a FLIR camera for acquisition using a USB port. I already purchased a USB split cable, and have queried the ports, so I know exactly ...
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42 views

Separate powering for USB

I have a 7-port self-powered USB 2.0 hub and I want to use but I want to feed power from another source so that I can give all connected devices 500mA of power. I also want to have a switch for each ...
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11 views

Battery charging 1.2 Testing (BC 1.2)

USB IF has specified tests for devices with BC1.2 Ability. I am checking their original literature on the matter but it's just too complicated for my understanding. is there any link on these tests or ...
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3answers
54 views

signal eye voltage level too high USB 2.0 Upstream near end

I am using the ‘Allion USB HS Device Electrical Test Fixture’ with a Lecroy oscilloscope (4 GHz, 40 GS/s) in order to make a USB upstream Near-End Signal Eye measurement (for High Speed Measurement). ...
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37 views

Why USB-C Power Delivery charger and USB-IF cable is not charging the phone? [closed]

I have a USB-C charger with Power Delivery specification (it can charge 5/9/12/15V==3A and 20V==4.35A). Not sure if this is Power Delivery 2.0 or 3.0. I'm using a USB-IF Certified cable, up to 100W (...
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46 views

Looking for solution for recording SPI-ish data stream [closed]

My goal is the following: I have a laser 3D-printing machine, and for monitoring purposes I want to log the X- and Y-coordinates of the laser movement. The machine in question has a digital interface ...
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1answer
63 views

how to let dc only go one way

I'm planning to make a circuit that lets me switch my keyboard and mouse between 2 computers. this shows me how to do it. https://hackaday.com/2016/11/12/diy-kvm-switch-lets-you-use-one-keyboard-and-...
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39 views

Fix burnt USB port [closed]

I accidentally connected the 5V output of my arduino UNO with a 12V power adapter (I wanted to use a transistor as a switch for turning on some fans and touched the breadboard line). Unfortunately, ...
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0answers
37 views

Soldering wires in place of mini USB

I'm working on a project that I need to take up as less space as possible. One of the components included a mini USB port that I have desoldered. The only problem is that the pads are too small. I ...
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45 views

How to check if a usb port is charging? [closed]

I have a charging station for PS4 controllers (has 2 controller capacity). It has two led lights in front of it, I thought these were charging indicator lights but then realized that they are ...
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1answer
46 views

How to construct a switch that would switch between two USB outputs, controlled electrically?

Basically I have a Smart TV, Raspberry Pi connected to it and wireless mouse and keyboard, using a single dongle for connection. What I would like to achieve is to being able to remotely switch where ...
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46 views

USB cut off with N-MOSFET

I would like to use a N type mosfet in order to cut the current from a USB charger. The mosfet reference that I currently have is an IRLB8721. I have already done a similary thing to another project ...
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42 views

Need to branch USB data lines… what to do with unused ends?

I have a USB 2.0 low-speed connection design with an unusual constraint. On the host side the D+ and D- lines have a branch, a requirement of the connector and this cannot be changed. On the device ...
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26 views

How to program CH559 to use one USB as master the second one as slave?

I have found a video in youtube which uses CH559 to connect a normal mouse/keyboard or both at the same time in order to make inputs to arduino. These inputs can be visualized from the OLED ...
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29 views

USB 2.0 Signal Integrity Using HSETT

I am trying to test USB 2.0 Signal integrity (Eye Diagram). For doing that, USB IF Forum lets you download the EHCI HSETT Software from their website. However, I am not able to use it due to one ...
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1answer
54 views

Can a USB power source run 4 IR LEDs in series without a resistor?

USB is 5V, and the voltage drop across the 5mm IR LEDs I'm gonna use is around 1.2V, if I connect 4 IR LEDs in series and perhaps more in parallel, do I still need a series resistor? Will cooling ...
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1answer
43 views

MCP2221 circuit not showing up in device manager, let alone as a COM port

I have made a simple custom board based on an Atmega168A and a MCP2221 for the USB bridge. I have successfully programmed the Atmega to shine the on-board LED and display "hello" on the Serial bus (...
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1answer
41 views

Considerations for connecting 5 pin wire cables and interfaces to USB?

I found a module breakout board that has a generic looking 5 pin USB internal motherboard looking plug. The module comes with a 5 pin connector which is in the second picture below. My ultimate goal ...
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1answer
64 views

Converting a USB C into a Y-split USB A for chaging

I'm looking to split a USB-C (female) into two USB-A (female as well), strictly for charging. Would it by any chance be possible for me to solder the four voltage connector pins from the USB-c to ...
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2answers
54 views

Z-6170 USB cable

I need to make a USB communication cable for the Zebex Z-6170 barcode reader. I found a reader pin-out description but I can't understand it. It is about powering the reader from USB and pin 1 (USB ...
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89 views

Is it OK to have flying leads on a differential pair?

I'm designing a small daughterboard that contains a microcontroller and a USB port. This board also has a connector to allow it to connect to a motherboard. What I'd like to be able to do is to have ...
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1answer
48 views

STM32F4 :USB Mass Storage Write Low Speed Using FATFS Library

I am using fatfs library developed by http://elm-chan.org/ for reading/writing file system in usb mass storage using stm32f4.As I know, for improving speed throughput one should write data buffer in a ...
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1answer
96 views

What happens when a computer's USB is overloaded?

I believe USB ports on my computer are rated for 0.5A, 5V. According to Ohm's law, if I connect a 10 Ohms resistor to a port it will reach it's maximum current limit (5V / 0.5A = 10 Ohms). What will ...
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35 views

USB hub upstream power backfeed

I'm designing a board that implements a USB hub. The upstream port will be connected to an Android tablet (or something like that) and the downstream ports will feed some other devices. The board ...
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40 views

USB C 2 wire, how it works & Connector repair

I wanted to repair an usb cable from a charger which can output 3A max. So on my charger cable, I got 3 wires. I got another USB C cable which can support 3A (USB-A to USB-C) and it only has 2 wires. ...
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1answer
56 views

Issues with this USB ESD protection circuit?

I've used this ESD circuit on four boards for hobby projects. I have had no issues on two boards. On two others, the TVS diode for VBUS conducted when the board was plugged into a USB port, causing ...
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1answer
49 views

Power output neccesary to power multiple USB devices at once?

If I have a device that requires 5V and 2A to function, what kind of power supply would I need to power 4 of these devices at the same time to their full capacity? Here is an example setup: Power ...
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1answer
68 views

Steal 5v from USB Module in 3v Mode

My project includes an ESP8266 (runs at 3.3v) and a USB C-Serial breakout. The USB module can optionally run at either 5v or 3v, and there's are solderable jumper pads to make that switch. Here's ...
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1answer
70 views

How can I solder a 2nd connection to a mini USB?

I have a device that utilizes a mini USB port to send and receive data. I am trying to figure out how I can hook a micro controller to that mini USB port so that it can also send and receive data. ...
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33 views

Why wont Micro USB Hub work with UVC Receiver?

I want to charge my phone and be able to receive wireless signal via a UVC Receiver. So I ordered a Micro USB Hub Adapter that supports OTG and charging. Well, I tested the hub adapter today, but the ...
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2answers
80 views

Two USB ports for one IC

I have to get two USB 2.0 ports connected to a single chip delivering data and power. If only one port is connected, this connection and power should be forwarded to the IC and if both are connected ...
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110 views

Failed to connect to esp32: timed out waiting for packet header when flashing

I have using an esp32 wrover b chip, an esp32 adapter, and a USB-serial converter. I am trying to flash micropython onto the esp32 via the usb-serial connector, but have encountered a few connection ...
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1answer
60 views

Can I use headphone extension cord as USB 2.0 data to webcam? [closed]

I have read that "slow", presumable USB 2.0, can only run 3 meters, while fast USB can run 5 meters. I have a long headphone jack extension, and I'd like to use it to access a webcam in another room. ...
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13 views

USB Mini B THT Verical pin assignment

Good day. I have been going through the internet looking for pin assignment of USB-Mini B throughhole vertical, but came empty handed. I know those of SMT one. But they seem to be different from those ...
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43 views

USB Charger Voltage Specification - Transients

Is there a specification for a USB charger that discusses whether voltage transients are acceptable, is if so, under what conditions? Specifically, I know a USB charger needs to have a voltage of 5V +...
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2answers
94 views

Cutting a slot in a PCB using a hand file for a USB connector - are the planes exposed and shorting with the connector?

I'm making a HID keyboard which connects through micro-usb. Unfortunately I made an error in the PCB design and missed including a slot for the usb connector to fit in. Being the enterprising DIY ...
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2answers
93 views

Control USB power by USB power

I'm trying to power a Raspi from a Power Supply but I would like to switch it on and off depending on if the USB out from the TV is on or off (the USB from TV is not needed for anything except ...
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1answer
35 views

Who sends the USB SYNC/EOP fields, host or device?

I'm currently studying the USB spec and I have a question about who sends the SYNC and EOP fields in a packet. A typical GET_DESCRIPTOR transaction (say) consists of SETUP and DATA0 packets sent from ...
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1answer
83 views

What is happening when I apply 5V DC to the DC end of a 12V AC to DC adapter? [closed]

The question is in itself a little bit confusing but I will try my best. So I have a normal 12 volt (1 amp) AC to DC wall charger, nothing fancy about it. I use that to power a fan, which works great ...
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2answers
29 views

ESP32 Dev Board DTR/RTS

I recently got an ESP32 development board. I also found the schematic to this board online but I got an question. Can someone explain to me, what this part of the circuit is doing? Schematic: https://...
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2answers
91 views

Where can I look for USB 3.x superspeed mux chips for poor people that only have through-hole soldering tools?

I'm new to this realm of purchasing and I'm not exactly sure which of the different package names (SSOP, VQFN, etc.) are more friendly than others for basic through-hole soldering. I would also be ...
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1answer
60 views

Which is best converter (FT232RL vs PL2303). Reson? [closed]

Please tell me about the main reason for using the FT232R IC compared to the PL2303 IC. Which is the best IC, and for what reason?
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32 views

USB OTG device that always supplies +5V, any issues?

I recently came across an USB device that seems to have a broken USB OTG implementation. The device always provides +5V on its micro-USB port, and using the appropriate adapter, you can use other USB ...
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23 views

Is duplicate sequence number valid under 3.0?

I am trying to debug a USB 3.0 issue where device endpoints become unresponsive. I have a protocol analzyer, and I see the following at the moment of breakage: If I expand the packets, I noticed that ...
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1answer
165 views

P Channel MOSFET is not behaving with another MOSFET

This is a very simple (or so I thought) power switching circuit I made for an extremely low, power consumptive device. The device normally runs on a 3.6v lithium, but occasionally a user will plug it ...
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0answers
85 views

Infineon PMIC I2C connection for first programming

I want to use the Infineon IRPS5401, a Power Management IC with PMBUS functionality through the I2C protocol. Infineon suggests using the USB005 dongle https://www.infineon.com/dgdl/ug-usb005.pdf?...
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29 views

Integrating USB C Power Delivery into a PCB [duplicate]

I am aware of USB C Power Delivery trigger boards that uses PD protocol to output the desired voltage from a PD source. But I was curious if it would be possible and feasible to design and integrate a ...
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8answers
8k views

Why did they design new connectors for USB?

At the time when the USB standard was being developed, there were a number of widely-available connectors that they could have used instead of making a new custom connector. Why did they not use mini-...
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0answers
212 views

Will this reversible USB-A circuit work safely?

I'm working on a PCB USB stick with a reversible USB-A connector. This device should work reversibly with any normal USB host. I know that it works fine with just the topside, but I realized it ...

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