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

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Populating a list of connected ATMEGAs

I'm building some switchgear. Currently building a GUI to control an unknown number of PCBs based around the infamous ATMEGA328P, via a FT232R to the UART of the MCU. The current way of populating a ...
4
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2answers
1k views

Accidentally knocked a capacitor off a laptop motherboard seemingly related to USB

I accidentally knocked off a capacitor from my laptop motherboard (Lenovo Thinkpad S540, VIUS6 LA-A171P board). According to the circuit diagram, this capacitor (C2434) was something to do with the ...
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0answers
25 views

Problem when programming Atmel ATmega16U4 using USB

I'm having a problem when I'm programming the ATmega16U4 through USB port. I designed the PCB, but I will assume the hardware connections are good. It is because when I connect the chip to the ...
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0answers
22 views

Microchip DV102013 Not Recognized by Computer [migrated]

I am attempting to use the DV102013, a multi-touch PCAP by Mircochip, but when I connect it to the computer, there is no sign that the computer recognizes the device. The LED on the device lights up ...
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0answers
23 views

USB DCP Controllers [closed]

What are the possible USB DCP controllers available today? So far I found: MAX8895 TPS2511 & TSP2511-Q1 TPS2513 & TPS2513A-Q1 TPS2514 & TPS2514A Interested in creating a community ...
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0answers
53 views

Where can I find SOLDERLESS usb connectors? [closed]

I have been on the hunt for solderless USB connectors. I know they exist, as this website 1UP Keyboards has USB cable kits which contain the solderless connectors. I don't want to buy the kit and ...
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2answers
82 views

USB, UART, SPI difference and usage? [closed]

I am trying to enabling an embedded system built around Intel D1000 MCU. I am mainly from a software background and just starting to catch up with some hardware knowledge. I am trying to build ...
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0answers
28 views

Verifying that a USB-to-RS485 to RS485 wire are successfully wired [closed]

Good morning! The issue I received an IP camera HD Fully Integrated PTZ. I wired it to my computer through the Ethernet and USB ports. I can monitor it from the local server (by writing the camera ...
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1answer
236 views

Use ATX power source to power Raspberry Pi

I'm setting up several Raspberry Pi's and Arduinos connected together, and I'm looking for a way to power them. Would it be possible to adapt an ATX stock power source with female USB plugs using the ...
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0answers
64 views

How do I build an interface between MicroBlaze and the FTDI FT600

I would like to implement USB 3.0 communication (instead of UART) with a custom FPGA board using Microblaze. I have already testing basic communication functionality in verilog, writing and reading ...
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0answers
14 views

How many kinects my computer can handle [migrated]

I want to use many sensors at the same time, such as two kinects. And I want to make sure that my laptop can handle two sensors. I looked for some hardware requirements and my question if anyone can ...
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0answers
56 views

Atmel ARM, USB, and an SD Card as a MSD?

I'm currently trying to run the SAM L21 as both a CDC and an MSD over USB. Thankfully there is example code here to get me started. I can move files into the on-board ram just like any other storage ...
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1answer
79 views

How to capture USB data on the oscilloscope?

Using 2 channel oscilloscope (BK precision 2542B), channel 1 trigger on the triggered signal, channel 2 is on the Data+ of the USB port. After sending the triggered signal to the bar code scanner, I ...
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3answers
66 views

USB cables combining shield and power ground conductor

I see a lot of USB "charging" cables on the market with cutaways showing two small data conductors, one large power conductor, and shield. The implication is that power is conducted in the shield. ...
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0answers
20 views

Agilent 4155C/4156C Saving spreadsheet data directly to computer

I am using a Agilent 4155C Semiconductor Parameter Analyzer. Does anyone know how to save spreadsheet data using SCPI or FLEX commands directly to the computer instead of to a floppy (diskette) disk? ...
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3answers
59 views

switching 3A/5V with an optocoupler [closed]

I am planning to switch the 5V line to a USB load. I have being going around different suppliers looking for an optocoupler that can handle 3A at 5V. I have seen a few, but upon looking at the ...
0
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1answer
78 views

BeagleBone Black won't power up from USB

I have been successfully using BBB powered from the USB adapter until now. I had to do some restart, and then the board won't power up (the PWR led blinks once ...
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2answers
102 views

16 separate lines via USB

So let me start apologizing if the question doesn't make any sense at all, I'm a total noob and I haven't quite grasped most of the concepts yet. I have designed this small visual indicator, which ...
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0answers
4 views

Troubleshooting overheating USB Hub [migrated]

I have a Maxxtro MX-UCZ USB 3.0 Hub and recently it started getting hot for no apparent reason. After opening the enclosure and looking at the board from both sides I have seen that all solder joints ...
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2answers
133 views

What is the source of this shape on my USB eye diagram?

I have designed a USB device around an STM32F105. It is USB 2.0 Full Speed CDC device configured as a Virtual COM Port using ST's USB Library. It uses the STM32's built-in PHY, and runs at 12 Mbps. ...
0
votes
1answer
50 views

Homemade car socket USB charger - picking proper capacitors [duplicate]

So, I decided to make my own USB charger to use it in a car (even though I got it from China 2pcs for 1.4USD). I've started simple as possible, with using only 7805. Well, the effect was reached - my ...
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0answers
21 views

Mircro USB3.0 Mixing external 5V-Ground with the rest

So, my friend has a laptop whose only USB connection, a 10-pin micro USB3.0 connector has a broken VBUS (+5V) connector. I'm thinking to make an adapter where I can plug in a USB charger for +5V and ...
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1answer
65 views

Ground my body to DC (USB) [closed]

Does grounding body to DC power source makes sense, to get rid of any electrostatic(?) charges from my skin/body ? In my new house, when I'm standing on the floor, connect voltage meter (AC) and ...
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1answer
62 views

My printer injects hum into my USB ports [closed]

I have a Brother HL-L2305 laser printer. I love it. I also have a pair of KRK Rokit 6 G3 speakers that I run off of an MBox 3. Every time I plug the printer into any USB port, hub or not, a loud hum ...
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1answer
65 views

How does a USB Hub work?

I know google's answer and wikipedia's answer for the above question. But I have a more specific question on hand. USB hubs have many incoming and port and just one outgoing port, I am able to use ...
3
votes
1answer
88 views

Why does usb have start of frame packets?

I'm developing some high-speed USB firmware for the STM32F746VG, and on page 1411 (under section 37.16.3, step 2), it tells me that I should enable start of frame interrupts. I know that usb hosts ...
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1answer
53 views

USB Full-Speed driver's effect on transfer speed

I am experiencing problems with USB communications which seems driver related. My setup involves an embedded device set up as a virtual com port (CDC/ACM) with which I communicate over USB. The ...
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0answers
34 views

ESP8266 not responding with CP2102

I connected my esp8266 with USB to TTL CP2102 as follows: ...
4
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1answer
66 views

Can a USB device attempt to be bus-powered and then fall-back to self-powered?

The device has a battery, but it would be nice to be bus-powered when available. A computer will typically supply 500 mA, for instance, while a smartphone in OTG mode is only required to supply 8 mA. ...
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1answer
67 views

Is there supposed to be a voltage differential between V- and Earth Ground on my Power Supply? [closed]

I'm debugging something in my machine that's causing it to blow my communication chips (AtMEGA16U2 for USB connection) when I noticed a voltage differential of 0.3VDC-0.9VDC between V- and GND on the ...
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1answer
65 views

Building a USB Charging Circuit Using 120VAC

first time here. I've been working on developing a 3-port USB charging circuit coming out of a 120VAC wall outlet. Here is a basic schematic of what I'm following. I've been having some trouble ...
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1answer
25 views

Powering USB hub using fast charger

I'm working on a project where there will be 3 USB devices and a Qi transmitter that are hooked to a USB hub board. I just need USB High-Speed, not 3.0+. The 3 USB devices would consume total of ~1A. ...
2
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1answer
217 views

STM32 “USB Device” vs. “USB OTG HS” - what is the difference?

I recently downloaded the stm32 app for MCU search and found out that for example STM32F429 has "NO" in "USB Device" peripheral, while it says "YES" in "USB OTG FS" and "USB OTG HS". Which is quite ...
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3answers
45 views

Audio Signal Noise: Understanding & Troubleshooting

Today, I'm wearing a pair of active headphones for a change.. ( Running on 2x AAA batteries ). I've hooked them up to a synth and noticed this really annoying monotone buzz / hum in the background. ...
0
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1answer
38 views

Problem in circuit that charges tablet/cell phone via Micro-USB port

I am trying to design a circuit that can charge tablet/cell phone via micro-usb port. Attached is the circuit I put together. The basic idea is, take 6 ~ 12V DC from an AC-adapter, then step the ...
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0answers
44 views

tingly feeling when moving finger [duplicate]

while charging my Ipod or other USB based devices from a wall wart, i get a weird feeling, only when i move my finger against the metal surface. for example, the metal back panel of the ipod. Am sure ...
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1answer
48 views

Control USB powered light with PWM, would it work?

A few weeks ago, I asked about controlling a DC powered LED lamp using PWM here, I was told that if I can get a LED lamp that uses an external DC adapter to power up, I can use a MOSFET and control it ...
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0answers
34 views

Reading text from a USB drive connected to an ATMega1284

I am embarking on a project to create a very crude "crypto module" to learn some basics about how a hardware encryption module might be implemented. I understand right off the bat that on the whole ...
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1answer
39 views

Does it matter what the input voltage is to a DC/DC step-up converter?

I have a converter that outputs 5v and 1 amp. The input voltage can be 2.5-6 volts. Does it matter as long as it is in the range? Also, will the current draw from the batteries differ if I change the ...
0
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1answer
59 views

What are USB Connectors made of?

What type of metal are the tips of USB connectors/plugs typically made from? Aluminium? I've noticed they will often, quite-easily, oxidise/rust/corrode.
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1answer
67 views

Build own custom USB 'regulator' adapter board to solve Desktop boot hangs with KVM

My Desktop PC hangs in the BIOS boot phase when my KVM is attached. If I unplug the USB connecting the PC to the KVM, the PC boots without hanging. If the USB of the PC is connected directly to the ...
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0answers
34 views

System not working as expected - resistance measurement

I found a problem while measuring the resistance from PCB1. When both the FETs are enabled on System 1,the resistance is measured. PCB1 is powered from USB port 1 and system 1 is powered from ac-dc ...
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1answer
74 views

Switching USB connections between two devices?

I currently have plans to convert a keyboard to bluetooth using a bluefruit module, but I would also like to have a switch to make it wired if I ever want to plug it in. The bluefruit module is being ...
0
votes
1answer
89 views

Switching between two power supplies with a P channel Mosfet, Is VGS or VDS a problem?

So I am using the following circuit to switch between VIN 0-30v and USBVIN 5v. I thought I found the ideal solution until I realised the FET in the schematic only has a max VGS of 8V. But I don't ...
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0answers
36 views

Device descriptor stall on windows, works on linux microchip mla

I'm designing a USB device with Microchip's MLA v2015-08-10 on a PIC24FJ128GB202. The device works as expected on my Fedora 23 Linux system. It enumerates and is recognized as a HID device. On ...
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1answer
45 views

Is UL approval at all possible for low voltage USB and network LAN Cat6 patch cables

I am from a European distributor. Some of our customers, who export to the US are asking for UL approved Cat6 and USB patch cables. Is it even possible to UL approve these low volatage cables? i.e is ...
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1answer
74 views

How to connect micro-USB to voltage regulator for MSP430 microcontroller?

I am going to use a micro-USB to power my MSP430 microcontroller. That means I only need the 5v and the GROUND pin. However, after discussing that the other pins should be untouched.. my friend said ...