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

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2answers
37 views

Sense if USB is alive or dead ++

I'm using a 16 channel digital output module (NI 9375) from National Instruments which routes 24v (from a PSU) to several solenoid controlled pneumatic valves. So a valve is open when 24V is sent to ...
-1
votes
3answers
88 views

5V USB booster only giving 4.92V

I have a 0.9V-5V to 5V USB booster but I am only getting 4.92V. The product I'm using to needs 5V to charge. Is there anyway I can boost to voltage to 5.1V or 5.2V?
0
votes
0answers
14 views

OHCI implelementation, where to read device response from?

This is the last thing which I am not able to figure out. I am implementing OHCI for USB as a host on a AT91sam9G45, without any OS, baremetal. So, based on this protocol the Transfer Descriptor(TD) ...
0
votes
1answer
16 views

Can FTDI Basic Breakout and FTDI XBee Explorer USB be used alternatively?

I wonder if these two boards from sparkfun can be used alternatively for USB to Serial communication? The first: (FTDI Basic Breakout) https://www.sparkfun.com/products/9716 The second: (FTDI XBee ...
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0answers
18 views

USB-A Female to replace USB Mini Female

I have a 4 port USB hub that I tore apart to fit into a project. The data transfer is handled by a mini USB to the host device (computer). I replaced the mini USB female on the hub with a USB-A ...
1
vote
1answer
23 views

Cortex M3 debugging: Intermittent partial load of binary with pyOCD, then timeout

I'm debugging an embedded system and get intermittent binary loading errors when flashing the binary through gdb (well, arm-none-eabi-gdb, the toolchain gdb client). Here are the details of my setup: ...
0
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0answers
32 views

Smart phone micro USB port bypass charging.

The connection terminal inside the micro USB port on my phone is broken so I'm trying to bypass the port by wiring a harness from the charging posts. My battery is a HUAWEI "HB5V1HV 3.8V 2020mAh 7.7Wh ...
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0answers
50 views

why we are using USB termination as 90 ohm?

why we are using USB termination as 90 ohm? instead of that should we use 100 ohm differential what will happen, these impedance (90 ohm) purely based on USB Specification? or the external connecting ...
0
votes
1answer
35 views

What is a good strategy to read many button inputs while still doing USB?

I am trying to design a USB joystick with many different buttons. The board I am using right now has an ATmega32U4, USB port, and 16 I/O pins. I am using LUFA for a USB stack. I know that I can get ...
-1
votes
0answers
16 views

how to connect multiple USB GPIO module to single PC [closed]

How many USB 32 channel GPIO module can be connected parallely to a single computer and how to communicate with each modules through PC .And what are the steps to do this? and how to program this? and ...
0
votes
1answer
43 views

How to set baud rate 57600 with CH340G?

I'm working on android drivers (native code) for CH340G USB-to-serial chip. I've successfully tested it with baudrate 115200 and Arduino Uno CH340G but for some reason it does not work with baudrate ...
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1answer
33 views

Changing old batteries in handheld device and replacing the charger

I need them to power a small handheld soldering iron, which had an old battery that died. The original battery was NiCD 1200 mAh 2.4v I am replacing them with 2 NiMH-520rs in series First question: ...
0
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0answers
41 views

simple USB charging

I have a battery project that i want to charge via USB at around 300mA. If just using a wall wart then everything is easypeasy, but I want to make it compatible with a computer as well. What I've done ...
0
votes
1answer
66 views

Building a Generic Wireless USB Device [closed]

I'm trying to (re)learn STM32 MCU programming in C/C++ by doing a pet project. My goal is to build a generic framework for making wireless USB devices (e.g. keyboard, joystick, etc.). To a degree, I ...
1
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1answer
34 views

Testing FT230X USB i/f - best way?

I have designed in a FT230X chip to take RS232 Tx,Rx,CTS,RTS and convert to/from USB on a PC. The problem I am having is that I do not trust my terminal emulator RealTerm. I just cannot seem to get ...
0
votes
0answers
8 views

USB connector to Ethernet (and then a router) [migrated]

ok, i haven't really found an answer anywhere, but is it possible to have a usb cable transmit data through an Ethernet cable and by extension a router, basically what i would like to to is to have ...
1
vote
2answers
68 views

Splice high current charge source into USB cable?

Normal computer USB max current is much lower than needs of modern smartphone to charge while running, commonly needing ~2 amp chargers. I want to be able to have my phone connected to my computer ...
0
votes
1answer
103 views

Making USB power supply out of 5V 60A LED DC power adapter

first of all please sorry if my question would sound dumb, I'm new to electrical engineering I've did my first soldering of two wires just yesterday. So here goes the question: I have 5V 60A LED DC ...
-2
votes
1answer
71 views

How come portable phone chargers tend to use USBA?

How come most portable phone chargers use USBA rather than Micro USB for the output port? Is USBA supposed to be more tolerant? If they use Micro USB for the output (as well), the user could just use ...
0
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0answers
22 views

Getting started with CAD simulation

I'm playing around with CAD and drew lady ada's Powerboost 500's schematic, which is a USB battery booster. Typically when designing a booster like that, what sort of simulations/analyses are useful? ...
0
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0answers
11 views

Multi monitor thoroughput - getting my head around the numbers [migrated]

I want to link 12 Display Port (eDP) panels with 2048x1536 resolution each. The problem I have is with the hardware that will(theoretically at least) be needed to drive all this. I was told that an ...
0
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1answer
43 views

USB to 3v converter to power a battery powered FM transmitter?

I have a SCOSCHE FM Transmitter which practically eats up 2xAAA batteries, I was thinking of using my TV's USB power for the transmitter. My search lead me to this 3 in 1 DC-DC USB 5V to 3.3V ...
0
votes
1answer
76 views

USB to Optical Signal Conversion

I have a video signal coming from a composite video out (we can ignore audio at this point). Products such as EasyCAP can convert such signal to usb differential(d+/d-) signal. Arduino/raspberrypi can ...
0
votes
3answers
65 views

Help with dirt-simple led array

I am making a real simple 8x8 led array (each in parallel). According to this, can I just skip the resistor? Also, I have a usb charging port capable of 2.1A 5v. Can I just use the generic usb cable ...
1
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0answers
72 views

How to troubleshoot serial communication?

I connected my computer to a RM-BR300 controller to read its data, to try and mimic its functionality in the future. I'm using RealTerm and a USB to RS422 converter for the job - here's the result: ...
0
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0answers
47 views

Possible to power STM32 Nucleo boards with USB battery pack?

I have a wireless-transmitter module connected to a Nucleo board. The sensor draws power (~200 mA) from the Nucleo board's 3.3V out pin. Case A (successful): When I connect/power the Nucleo board ...
1
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0answers
45 views

USB connections, which is the most common and reliable?

I've found a lot of different ways to connect USB power and D+ D- in EVBoards and other kind of boards. I've summarized this ways in this schematic: (Right click and open image to zoom) As you ...
0
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0answers
50 views

How to use a 3.3V USB device?

I have a USB internal device (3.3V) to plug with a classic USB (5V). The device is a HP ENVY TouchSmart 17 t" touch screen with an eGalax EXC7920-SG11 chip. (documentation here) What is the best way ...
3
votes
3answers
165 views

Adding 90 ohm resistors to DIY USB cable?

I just started with electrics a few months ago, but now I am obsessed but still have MUCH to learn. What I am doing is essentially trial and error. I needed a longer USB cable to a printer so I took ...
1
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1answer
44 views

HP ENVY Touchscreen: USB device?

I'm building a DIY tablet with Orange Pi & A20 SoC (maybe I will change for LeMaker Bass) & Android 4.2.2 (v.5 with Bass). This is a 17.3' screen tablet. I already have a IPS screen, and all ...
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votes
2answers
23 views

relay for USB camera control

I need a little help with some electronic components: From my RC system a I get a signal which is 3.3V PWM, 5 volt and GND. I need to make a 5V PWM out of this for my camera. PWM values are ...
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4answers
56 views

Question about a phone wall adapter and it's current output

My phone charger (Male wall adapter to female USB) says it outputs 5V @ 2A on the back. I want to use it to plug a Male USB into. I guess my question is; is that 2A always being output? Or is it a ...
0
votes
1answer
46 views

Micro USB devices compliance for dock stations

Are there standards to define the micro USB plug front or back side to be compliance with dock stations ? Usually dock stations are designed to have a micro USB plug pointing up, and the plug is ...
0
votes
1answer
42 views

USB 3.0 power levels on USB 2.0 device

Is it possible to negotiate a USB 3 power level, such as 900 mA, if the device is connected to a USB 3 port, without being a device capable of the higher speeds? I'd like to use this higher level if ...
0
votes
1answer
37 views

Can anyone understand why my USB 1.1 full speed HUB not work, electronic issue

Our USB ports design include one USB transiever(STOTG04EQTR) and USB HUB(TUSB2036VF).The circuit drawing as below But even the USB1.1 doesn't work. I tested the data line , the waveform really bad ...
0
votes
2answers
96 views

Detect if usb device is connected on the other side of the cable

Is it possible to detect that there is a device connected on the other side of the cable without using any current sensor? I simply want my arduino to do something when i plug my phone to charger. I ...
0
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2answers
67 views

Is it OK to use the USB 5v pin as power source?

I am doing some stuff in my case and I need a power source for one LED from inside my case. I looked up and there are two +5v pins on a USB header inside my case. Is it OK to use them as power ...
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votes
1answer
76 views

Portable 1A battery phone charger

I want to make a little battery-powered portable phone charger with 2x AAs that outputs 1A. I have seen similar USB powered battery chargers such as the Mintyboost but it only outputs 500mA. For 1A ...
1
vote
1answer
47 views

What's the requirement to DIY PD aware USB connector?

According to some research, I should be able to pull +12v from a USB power source assuming my device is some how telling the power source that it is ready to receive +12v? I've seen a YouTube clip ...
0
votes
1answer
58 views

make a device for USB ejection [closed]

I want to make a device for USB which is connected through usb to PC and offers an usb port. The device should have a button which ejects (in Windows) the device plugged at the port of the device. ...
0
votes
1answer
28 views

Waveshare USB3300 board with stm32f429

I am trying to hook up the Waveshare USB3300 (http://www.wvshare.com/product/USB3300-USB-HS-Board.htm) to a stm32f429 discovery board. I have been having an issue getting it to work. It has two pins ...
1
vote
2answers
56 views

AtTiny84 with USB

I am having some problems with the ATTiny84 and USB. I am creating an "arduino clone" but I want a simple (and especially compact on the board) way to implement a USB serial interface. This will only ...
0
votes
0answers
35 views

How can I know if this USB hub can be supplied separately?

I have this usb hub: It's originally from a laptop cooler, but I'm using it for my project (DIY tablet). This hub has 2 plugs for the fans (I don't use them) and a principal plug (the big one) with ...
1
vote
2answers
78 views

What do I need to create a USB interface between a PC and a board? [closed]

I am making a custom camera that will be interfaced through the USB port to the computer. Currently, the board contains all necessary circuitry to drive the image sensor. It outputs a parallel stream ...
1
vote
1answer
45 views

How do i turn multiple usb ports off based on multiple sensors

I'm looking for a way to turn a usb port on an off from an Arduino, I'm looking at purchasing something like this and somehow using a pressure or light sensor to turn the usb port on and off. I was ...
0
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1answer
61 views

USB data serial termination resistors. Need them for STM32F2 micro? If so, what wattage?

I'm a little confused. The STM32F2 datasheet says only this, vaguely stated in the features: HNP/SNP/IP inside (no need for any external resistor) Is that referring to the D+/D- termination ...
-1
votes
2answers
92 views

What is the maximum Power that Smartphones charge with? 2400mAh? [closed]

I have seen chargers rated at up to 2400mA, so I wonder, whats the max that Smartphones will accept while charging? I ask because I want to buy a charger that is able to supply the absolute max my ...
-1
votes
2answers
50 views

How to redirect USB output?

I want to connect 2 PCBs to the same USB cable switch so I can choose wich one is powered. What component should I use for the Switch? Is this possible? ...
-1
votes
1answer
35 views

oDevice to measure power available from charging point [closed]

When charging, I know that USB socket that you plug your microUSB cable into will charge your device at SOME rate. But that rate varies wildly, depending on the original source of the power (high ...
0
votes
1answer
69 views

Name of the Samsung Galaxy end of charger [closed]

This is probably a weird question to ask but I am looking for the end "jack" of the Samsung Galaxy S3, S4 etc charger name. Is not the USB side of the cable, is the actual bit which goes inside the ...