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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.

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Confusion with the meaning of virtual com port

As far as I read, plugging a USB mouse into a PC is not creating a virtual port; but plugging a serial to USB converter does. This is very confusing for me since from PC operating system's point of ...
user4444's user avatar
  • 371
0 votes
1 answer
69 views

USB cables being affected by manufacturing equipment [closed]

I am an IT guy, who enjoys learning about some of the electrical engineering side of things, but I don't have a good grasp of the jargon. We have a client with about 40 different smaller production ...
Matt Tisdel's user avatar
1 vote
1 answer
104 views

USB data does not work on my PCB [closed]

I've build a PCB based on RP2040 microcontroller. A modified version of PicoDVI board - with added memory chip. The board works fine, with just one problem - it is not being detected when plugged to a ...
smokku's user avatar
  • 173
15 votes
3 answers
3k views

USB A mechanical orientation?

This concerns a USB A socket on a PCB. Is there a standard or preferred orientation of the polarization tab, either up or down? The picture shows one with tab towards the top
Dirk Bruere's user avatar
0 votes
1 answer
64 views

Replace this USB power board [closed]

I have broken this board, its for USB powered lamp. I presume it is a power conditioner for usb power... As its before the light color/control board. Im not sure if it was USB or USB C - I presume its ...
Wan33's user avatar
  • 103
-1 votes
1 answer
64 views

5V on DP and DM pins on FT232RL?

Can I apply 5 volts to the DP and DM pins of the FT232RL, given that the technical sheet says that the maximum voltage of these pins is up to 3.8 volts?
Gerasim Neshovski's user avatar
4 votes
2 answers
521 views

USB Data communication issue on a panelized pcba hardware test platform

I need some help.. I developed a test platform for the hardware tests of an electronic board panelized in sets of 10. The boards are placed on the test platform in their panelized form. As shown in ...
OzkulA's user avatar
  • 195
0 votes
2 answers
62 views

Do FT232 come pre-programmed out of the package?

I'm working on a board which requires USB serial communication. For this I want to use an FT232RNL, however I'd like to know if I need to program it before I install it on the board. Also, do I need ...
hdaniu's user avatar
  • 31
2 votes
2 answers
43 views

12V through USB Type C without PD

Can I get 12V to my system through USB type C without PD or configuration CC lines or Using CC controller? If yes how can I do that .
Vinod J's user avatar
  • 21
2 votes
4 answers
123 views

How is CRC5 calculated in detail for a USB token?

How is CRC5 calculated in detail for a USB token? ...
hugo289's user avatar
  • 23
2 votes
1 answer
66 views

FT230X using USB-C receptacle not working for data transfer

I have tried to add a USB-C connection to my PCBA solely for data transfer. I have used a FT230XQ-R microchip (Datasheet) and followed their uploaded example for a USB-C receptacle. I have now ...
Prolik_'s user avatar
  • 43
0 votes
0 answers
72 views

Purpose of NPN transistors in this ESP32 circuit [duplicate]

I am wondering what is the purpose of the two NPN transistors Q4 in the circuit below. (full circuit schematic) In this circuit, which is from an eval board for the ESP32-S3 microcontroller, ...
jemalloc's user avatar
  • 720
0 votes
0 answers
28 views

DC isolation - 3 separate circuits with same power source and shared I2C

I am trying to build one small project and based on the needs I need to isolate few components but also keep them connected using I2C. I was doing a research and found few DC DC isolator converters ...
Peter Bašista's user avatar
1 vote
1 answer
43 views

A simple visual indicator (LED light?) when a USB fan is on

I have a USB fan, some distance away from me, which I use occasionally. It's plugged into a charger and it has a manual switch. I sometimes forget to turn it off, because it's very quiet so I can't ...
MrSparkly's user avatar
  • 265
2 votes
2 answers
82 views

Home made USB 2.0 device switcher (for mouse/keyboard only)

I did buy some off the shelf ones, but they seem to fail after a few months and or screwing up the USB ports. I opened the switch box up and noticed that the two power lines were always connected to ...
Newb Coder's user avatar
1 vote
0 answers
68 views

Making audio signals imitate USB flash drives [closed]

If there is a USB port designed for USB flash drives that plays the audio files in that drive when it is connected --such as the ones commonly found in cars-- is there any practical way to turn an ...
adam_Barfi's user avatar
0 votes
0 answers
23 views

ESP32, BQ25895 sharing usb data lines

Im building a portable device with a ESP32-S3 which will be interfaced with a SD card, and a BQ25895 charge controller. The ESP32 will connect to the computer as a mass storage device. The BQ25895 ...
Rufus Ahern's user avatar
1 vote
0 answers
40 views

Flashing ESP32-S3 directly over USB

Since the ESP32-S3 offers USB-OTG, am I right if I assume that I only need to turn on the chip by pulling EN to high (3.3V) and then connecting it via USB to my PC? Am I then able to flash it via ...
Tintenfisch's user avatar
0 votes
1 answer
33 views

USB bank + capacitor for flash gun

I have a camera flash (Godox TT350), which typically takes 2 AA cells. These cells do not last long, so I bought some dummy cells, which are connected to a USB plug. The USB is inserted into a battery ...
user2362098's user avatar
2 votes
1 answer
94 views

How to design a Hardware Solution for Duplicating Mouse Events to multiple devices

I'm looking for a solution where I can use a single USB mouse to control two devices simultaneously. I understand there are software solutions for computers, but I specifically need a hardware-based ...
Gustavo Gomes's user avatar
1 vote
1 answer
84 views

USB and RS485 on same lines for ESP32-S3

For an ESP32-S3 based PCB that I am developing, I would like to be able to share 1 connector for two different communication protocols. USB connection directly to IO19 and IO20 of the ESP32-S3-wroom1 ...
Wouter Van Rompaey's user avatar
0 votes
2 answers
103 views

ESP32: How can I use USB for data only, but always require external power?

I am creating a PCB where a ESP32-S3-WROOM-1 sits on, which shall be powered by an external power supply (and a NCP1117 3.3V LDO) and not by USB. However, I will use USB to flash the ESP32, so the PCB ...
Tintenfisch's user avatar
0 votes
4 answers
89 views

How to convert MEMS digital microphone to USB? [closed]

I have a camera + microphone combo PCB board removed from an all-in-one computer and I'm trying to reuse it. The camera is a standard USB device. The wires are even properly color coded. So I just ...
Deling Ren's user avatar
0 votes
1 answer
80 views

How do I design a USB interface to program a custom microcontroller?

I am trying to design a microcontroller board that I can program over USB (like an Arduino). I would like to use the STM32L412KBU3, and going through the data sheet I see that USB_DM and USB_DP are on ...
Lane Womack's user avatar
0 votes
0 answers
19 views

USB Type-C DFP Host Port implementation without Switch

I am currently designing a new board that has a four port USB 3.2 x1 Gen1 hub on it. I only need two ports and now thinkering how to best make use of the other two ports. The idea was to make at least ...
Philippe Schenker's user avatar
1 vote
1 answer
94 views

USB to TTL (CH340G) quickly becomes unreadable

I bought a CH340G based USB to TTL converter to interact with a new embedded system I got. The output starts out fine but becomes unreadable after a few lines ...
user1129682's user avatar
0 votes
2 answers
64 views

How to route USB signals to CP2102

For some reasons I don't understand, the CP2102's USB signals are reversed from most common USB connectors: Of course I can place a couple of vias in order to jump on the other side and reach the pad....
Mark's user avatar
  • 1,235
0 votes
1 answer
50 views

Question about DC pin in USB C module. Is it possible to connect two USB C and Micro USB connectors in parallel to charge the same battery?

Good morning everyone, I received help from several members of this page regarding my goal of adding a USB-C connector to a tablet that already has a micro USB connector for charging. After ...
condor12's user avatar
  • 145
0 votes
1 answer
50 views

Are the data pins necessary on a mini USB connector used only for charging a tablet? Is the ID pin used for OTG?

I have an older tablet, and I plan to replace the charging-only micro USB connector (which does not transmit data) with a USB-C connector. However, upon examining the pinout, I noticed that the two ...
condor12's user avatar
  • 145
0 votes
0 answers
27 views

Using V2DIP1-48?

I am trying send data (in the forms of int or strings) from a Teensy 4.1 via UART to USB (in my case, a Flash Drive). I am using a V2DIP1-48 to receive the data from the Teensy, convert it to UART, ...
Q Q's user avatar
  • 1
0 votes
0 answers
33 views

How to fix erased On-Board Usb-Blaster FPGA (MAX II EPM240T100C3 on board Terasic DE10-Lite)

I have Terasic DE10-Lite board (with Altera MAX10 fpga), which use Altera Max II EPM240T100C3N (and usb-b + ftdi chip) for on-board usb-blaster logic. After explore 8 pins jtag holes on the board, i ...
Lion's user avatar
  • 11
0 votes
0 answers
41 views

Replace battery by DC source (USB 5V)

I bought a Bluetooth audio receiver which is powered by 3.7V Li-ion battery. I tried to replace the battery source to a USB 5V with a buck converter and I managed to achieve it, here is my work around....
許書和's user avatar
0 votes
1 answer
66 views

Interface micro SD card with MCU and USB port at the same time [closed]

I'm designing a PCB and I would like an MCU (ESP32-S3) to be able to write periodically on a micro SD card (logs). I'm using SPI. I also would like to be able to get those logs through a USB port on ...
AyubowanPro's user avatar
0 votes
0 answers
31 views

Gibberish data with custom Atmega 2560 UARTs

So I have an issue with the UART configuration of my customized uC based on the ATmega2560. To establish serial communication, I'm using the FT232RL chip and the Arduino IDE. I don't have any issues ...
Wyufiyra's user avatar
1 vote
1 answer
185 views

Windows doesn't recognize ESP32-S3 with USB OTG Console on a custom PCB

I made my first custom PCB with an ESP32-S2FH4R2 (datasheet). Since I also want to use the integrated USB OTG Console of the ESP, I connected GPIO 20 to D+ and GPIO 19 to D-. When I connect my PCB to ...
Omega's user avatar
  • 11
0 votes
0 answers
29 views

[STM32F412]Flash writing problem with USB Host active

I've a problem on the STM32F412 with flash writing and USB Host initialized. When USB Host is active and I attempt to write to flash, the software execution blocking at FLASH_FlushCaches function, on ...
Stefano's user avatar
  • 13
0 votes
1 answer
97 views

How do I implement a USB-C connector onto a pcb to power a 3.3v Raspberry Pi Pico?

I've been looking into how to create my own pcb with a USB-C connector which breaks out into pins (VCC, D+, D- and GND) to then connect this to a Raspberry Pi Pico microcontroller but I have a few ...
cAYK's user avatar
  • 3
0 votes
0 answers
49 views

How should I select the ohm values for pull-up and pull-down resistors in a device with a USB Type-C connector used solely for power

Good morning, everyone. I am exploring the transition of the receptacle from a micro USB connector to a USB Type-C. Initially, my plan included implementing both sink and source capacity. However, ...
condor12's user avatar
  • 145
0 votes
3 answers
95 views

Did Micro-USB have protection against "loops"?

I have an older USB power brick from a reputable, well-known company (i.e., not rock-bottom re-branded cheapest-as-possible). It has a female USB-A connector as output, and a female micro-USB ...
AnoE's user avatar
  • 508
1 vote
0 answers
30 views

Making wired USB MIDI controller transmit data over Bluetooth

I want to make a USB MIDI controller more practical by passing the data via bluetooth. I'm don't have that much experience with electronics engineering, so I'm coming here ask for advice. Namely it is ...
steve d.'s user avatar
  • 175
0 votes
3 answers
44 views

Use digital sensor with USB to serial TTL converter?

I have a sensor (HC2A-S3A), which provides analog and digital output signals. The digital interface is UART (19200 baud, protocol RoASCII). Can I use a USB to Serial TTL Converter (chipset: FTDI ...
Pontis's user avatar
  • 101
0 votes
1 answer
24 views

Jetson Xavier USB HUB design

I created a custom carrier board for jetson xavier. In that i added one USB 2.0 HUB. So can i take one USB 2.0 Pair from HUB and other RX and TX connections directly from Jetson and make a USB 3.0 ...
besto's user avatar
  • 1
0 votes
1 answer
61 views

CB style PTT Mics to USB circuit

I need to design a circuit that takes the input from 2 different CB style (4-pin) push-to-talk microphones and pipes them out to USB. CB mics I have confirmed use regular XLR balanced level output. ...
Muscle Nerd Jerry's user avatar
0 votes
0 answers
41 views

Getting "Target not found" after programming an STM32H755 using an external debugger

I used to program and debug using the USB port on my STM32H755 Nucleo-144. After flashing the code with JTAG, I can't connect the board to my PC anymore; it says "No target found". Is there ...
Varshini's user avatar
0 votes
2 answers
65 views

When/why to use a power source selection switch?

I'm designing an automotive device that will be taking power from the car's battery. It also has a USB port that will be primarily used for firmware updates and possibly datalogging down the line. I ...
Alex Jegers's user avatar
1 vote
1 answer
54 views

Conducted emission test setup for USB powered device with no mains connection

I have a medical device that is a USB client and has no internal power source/battery. It draws 5V from USB and also communicates to the Host via same interface. Device is intended to be used only ...
anishp's user avatar
  • 13
0 votes
1 answer
41 views

SD/µSD card pins

I would like to make a µSD card to USB adapter using this chip and this connector but the SD data pins on the chip are SD_D[0-7] whereas on the connector it's 063 and a bunch of PCIe pins. Which pin ...
Jolia's user avatar
  • 1
0 votes
0 answers
40 views

Converting a USB HID K/M Composite Device to a USB HID Compound Device (or Two Seperate K/M Devices)

I want to connect a USB composite device (Raritan KX4-101) with keyboard and mouse descriptors to a USB matrix switch with a very picky HID keyboard and mouse emulation (Extron SMX USB). From what I ...
braxlan's user avatar
0 votes
1 answer
84 views

Convert RS232 signal to USB

I have an optical amplifier that uses RS232 and I want to convert to USB. I've purchased this chip, also here. There is little documentation on this chip and the supplier hasn't responded to questions....
andrewhunter's user avatar
0 votes
0 answers
38 views

Impedance controlled PCB for USB 2.0?

We're doing a PCB for a customer that has Impedance controlled tracks for a microcontroller that seemingly might be max USB2.0, judging from lack of multiple data lines and the fact it goes in a micro-...
Jakesan's user avatar
  • 320

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