USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.
1
vote
2answers
84 views
Where I can find an USB dongle to connect two devices with external power?
Can you please tell me where I can find an USB dongle which follows this diagram:
I have a tablet and a BobjGear USB to RJ45 Ethernet Adapter, but the battery will discharge while using the tablet ...
0
votes
0answers
39 views
Integrating USB Camera on TI Hercules Evaluation Kit (ARM Cortex R4)
I am using a TI Hercules Evaluation Kit, which can act as a USB Host.
Here's the link [http://www.ti.com/tool/tmdxrm48hdk]. It is a ARM Cortex R4 with 8 MB of SDRAM.
I want to use a Logitech Webcam ...
5
votes
1answer
136 views
What does the USB bootloader do in the PIC microcontroller
I was wondering what does a boot-loader do, there is one USB Bootloader for the PIC micro-controller and I was wondering as to what its purpose is. How is it different from creating some HID device ...
0
votes
2answers
116 views
In USB, what is the difference between a PHY and a transceiver?
I understand PHY to be the physical layer of the transceiver protocol stack. At the same time I understand that transceivers are devices that transmit serial data at a very high speed i.e >100Mbps.
...
2
votes
1answer
110 views
Control multiple LEDs using an IC and PC/Linux thru USB
I've already tried to search this topic but all Google results said that this isn't possible. Is there any chance of controlling multiple LEDs using a PC/Linux, through USB? The diagram might look ...
-2
votes
1answer
109 views
Are there any split USB cables that can power two devices? [closed]
https://www.adafruit.com/products/501
I wanted to use this to drive two devices simultaneously (raspberry pi and peripheral).
I would like to have a y-cable - one end with a male Micro USB B-Type ...
2
votes
0answers
92 views
JTAG Programming with LPC4330
Because the Example Virtual Serial Device project from NXPUSBLib contains a space in it's directory structure (specifically Example_VirtualSerialDevice/LPC43xx M4/...) I can not successfully download ...
0
votes
1answer
71 views
Debug ARM processor by USB
I want to be able to add code to this MCU by connecting it to my mac by USB connection. How could I do this?
2
votes
1answer
196 views
Interfacing barcode scanner with microcontroller
I am doing a project involving barcode scanner, netduino plus 2(microcontroller). I came across different types of interfaces(pin standard used such as USB etc..) for barcode scanners which are ...
0
votes
1answer
217 views
STM32 - PC serial sommunication
What are the available options or ways to connect the STM32 discovery board using UART to a PC via USB or the serial port ? What is the required hardware/cables ?
0
votes
1answer
144 views
A simple usb controlled switch
I'm not really a hardware guy but I am thinking that this might be a simple build. With some guidance.
Basically I want to hook a physical button switch to a controlled one for my camera. So that I ...
0
votes
1answer
183 views
Arduino printer emulation
I'm working on a project in which an arduino should emulate a thermal printer.
I'm currently using an Arduino UNO R3 board with ATmega16U2 controller to handle the communication between USB and the ...
2
votes
1answer
181 views
USB to GPIO module
I'm working on a project which involves having users press buttons on a webpage which the server needs to send onto a microcontroller in the form of a GPIO signal. The only ports available on the ...
3
votes
1answer
118 views
USB 2.0 PCB trace design restrictions
Thanks to the help from this community I am much closer to finishing my new design. Right now I am most worried about my USB 2.0 traces, and I want to make sure that I am doing everything right with ...
0
votes
1answer
98 views
Questions about connecting a passive infra-red sensor to the USB port
So, we are linking a sensor to a computer via USB, using a female USB connector and male USB wires. The sensor is connected to a circuit with 3 pins, vcc, ground, output signal. If I would want the ...
0
votes
1answer
79 views
How do I debug or visualise my ARM USB HID project on Mac
I've been looking around to try and find an application for Mac OS X that I can use to visualise the inputs of an USB HID device, like for example a game controller, or my USB HID STM32F4 Discovery ...
2
votes
3answers
311 views
arduino and bluethooth usb dongle
Is it posible to use a mini USB bluetooth dongle like this one
(image)
in order to improve my arduino UNO so it can comunicate with other bluetooth devices? If it is, how can I do that?
0
votes
4answers
156 views
Readying a New Design, would appreciate som feedback
I designed a Arduino shield compatible board around the NXP LPC4337JBD144. so far I have been unable to get the first revision to program.
In the first design the JTAG header was not setup ...
1
vote
2answers
190 views
Motors controlling Arduino usb question
simulate this circuit – Schematic created using CircuitLab
I made a RC car with an Arduino board, using an H-bridge to operate the motors. I connect them through a capacitor and a diode ...
4
votes
2answers
167 views
Question related self powered USB Hub
We have a requirement, which is a normal self powered USB Hub, with individual power control of the ports, i.e in addition to a normal Hub, we want to remove the power to any of the downstream port on ...
1
vote
1answer
124 views
Arduino board not detected when connected via USB
I have an Arduino clone called the InduinoX. It works with my mother's laptops and I can program it, but in my other laptop it goes undetected. It's last uploaded program works when connected ...
1
vote
0answers
759 views
STM32F4 USART USB communication with PC?
I am trying to use STM32 provided example of USART called "HyperLink" which basically runs USART1 on ports PA9 and PA10.
The problem is that my computer does not find any new COM ports.
Do I need ...
-3
votes
1answer
174 views
Schema for USB cable to charge old Nokia phone [closed]
I am looking to make a USB cable to charge my antique Nokia phone (Li-ion 3.7v 700mAh). I have searched and found a few articles but they have left me a little confused. The cable should work with a ...
3
votes
1answer
130 views
USB + Power: Isolate or not?
I am working on an adapter that will allow a device to be connected to both a PC and external power supply. I am wondering if I will need to isolate the 2 5V supplies with a DC/DC converter and some ...
1
vote
2answers
177 views
Controlling an electrical motor with my laptop
I want to control an electrical motor with my laptop, I want to start with the following:
a mini server connected through WiFi to my laptop
I want to connect an electrical engine to this mini server
...
-3
votes
1answer
104 views
Android phone USB charging has a mind of its own [closed]
I have a Sony Xperia phone. I have 2 USB-to-USB-micro cables, a power charge-only one and a data/charge one.
I connect the phone to my PC to charge the phone. When the PC is on, both cables charge ...
4
votes
2answers
173 views
USB3.0 Type A socket plastic insert
This question will probably be downvoted pretty quickly because it sounds like a shopping question, so let me start off by saying I am not looking for the lowest price, or even where to purchase this ...
2
votes
1answer
255 views
How config STM32 with two different Clock speeds
I'm using STM32F103RE for implementing a time-consuming operation. This device is connected to PC via USB port. I'm not expert in configuring these MCU, but seems when it configures to communicate via ...
1
vote
1answer
155 views
USB OTG, some questions
I am attempting a project with USB OTG functionality. I've read quite a number of documents already but there is some contradicting information out there, so I want to find out if anyone can shed some ...
0
votes
1answer
394 views
Connecting old webcam via USB
I have removed the webcam (Chicony CNF-9157) from an old laptop with the intention of connecting it up to a computer via USB. The webcam and the LCD were connected to the motherboard by LVDS. ...
1
vote
2answers
258 views
Would this USB detection circuit work as expected?
What I am trying to achieve is detect from MCU, whenever FTDI(FT232R) chip is connected to USB(not enumerated, just powered up from USB).
When ONLY USB is connected, MCU will get his power supply ...
-4
votes
1answer
216 views
12v lead acid to 5v USB using Car cigarette converter [closed]
I am trying to power up a Raspberry Pi outdoors. So I got a lead cell battery and a car cigarette lighter to USB converter (12v-to-5v step down converter). Unfortunately, before even connecting the ...
0
votes
2answers
139 views
to solder this wires or not?
Im making a USB adaptor for a Kinect sensor [to use on my computer].
here the schematic of what I did,
Now, the question,
I have soldered all cables with their color match, but There are 2 other ...
6
votes
2answers
372 views
What is the reason this USB battery charge circuit will not work without a diode?
I have a single cell, ~2100mAh rated Li-Ion battery. Something like 18650, I have taken it out from a laptop battery pack. I want to make a simple charging circuitry for it since I will use it in the ...
6
votes
2answers
172 views
USB vs Ethernet cable length
I was talking to a colleague about the limitations of USB cable length and as far as I could remember it was limited by the tight window the host requires the device to respond in (mentioned here).
...
4
votes
3answers
122 views
Digital Isolation comparison
I am currently using ADuM4160 by Analog Devices as a USB isolator.
However, this part is EXPENSIVE. I was wondering if anyone thinks it can be replaced with ADuM2200.
Any reason why this wouldn't ...
3
votes
1answer
167 views
Separating USB/MCU power buses
There are two power supply sources in the following diagram - USB and 12V. Only one power supply can be connected at the same time. I am trying to disable power to ...
-1
votes
1answer
125 views
Looking for easy USB Sound Card Chipset [closed]
Does anyone recommend a chipset for a USB Sound Card (w/input), with readily available drivers for both linux and windows.
I am making a phone line tap to record dial modem calls in the field, for ...
0
votes
1answer
148 views
FTDI/MCU design question to detect boot mode
MCU(ATMega 8 series) on my device has two operating modes
Bootloader mode
Normal operation
The firmware can be upgraded through MCU USART interface. To connect to PC I want to place ...
0
votes
1answer
162 views
FT232 DTR pin behavior
The question is whether DTR pin of FT232RL becomes active only if the chip is plugged into PC USB host where drivers are ...
-5
votes
2answers
121 views
Keyboard USB to USB 2.4Ghz RF conversion [closed]
Where to find information about "2.4Ghz" keyboards and mouses protocols? I'm investigating possibilities of creating (or buying, if such thing exists) of universal USB>2.4Ghz rf/ 2.4Ghz rf>USB for ...
0
votes
0answers
96 views
Controlling USB Power with External Voltage Source
I was trying to figure out a way to add a switch to the USB +5V wire, that could be controlled with another voltage source. I was thinking about using an optocoupler + mosfet to do it.
More ...
2
votes
3answers
254 views
Emulate USB device with USB host
Is it in principle possible to connect two computers with a USB A to USB A cable, and have one pretend to be a USB device, and the other act as host?
Assume I have complete control on the software ...
4
votes
1answer
697 views
Y USB Cable with external 5V supply
I just got a brand new Nexus 4 phone and am a bit dissappointed that it doesn't support USB OTG. One reason is that is doesn't supply 5 V out of its USB port, as opposed to other Android devices I ...
0
votes
1answer
108 views
Making dc barrel usb cable and can't find the positive polarity
I have found out that my dc barrel is tip positive. after cutting the the barrel I realized that there is on insulation inside the black insulation itself to identify which one is positive and which ...
2
votes
3answers
1k views
Communication between a USB/serial device and an AVR (atmega/Arduino) microcontroller
I have a device which provides a USB port. If I attach it to a Windows PC it is recognized as a "CP2103 USB to UART Bridge Controller". According to the device documentation, it should communicate in ...
-5
votes
1answer
139 views
Building an embedded system [closed]
I want to build an embedded system with USB and Wifi. I am going to use USB to load configuration and code. Wifi will be used to communicate with other similar systems. I would also like to program at ...
6
votes
1answer
189 views
Is it possible to make a power auto-selector (ORing) with just a Diode and Mosfet?
I know there are ways to create a simple auto-selector using a mosfet and op-amp, or even simpler using just Diodes, but is it possible to have this work:
The mosfet is P-Channel so floating gate ...
-1
votes
1answer
78 views
GSM Power Supply
http://www.powersystemsdesign.com/usb-modem-design
Can anyone tell me how the energy values in the table are calculated in the link above,
6
votes
1answer
642 views
TI Launchpad MSP430 on Serial in Linux
The MSP-EXP430G2 LaunchPad Experimenter Board User's Guide (Rev. C) in chapter 3.2 states:
The LaunchPad includes a pre-programmed MSP430G2553 device [...]
Press button P1.3 to switch the ...
