1. A

    Problem with CH340C

    Hi I made a board that contains an ESP32-WROVER and an USB to serial adapter ch340c but it's not visible when I connect it to the PC (Windows 10). I tried to install the ch340 driver and I even tried 7 USB cables but the problem still remain. So maybe I have a mistake in the design ? PS: 3.3V...
  2. shibin_varghese

    Connecting USB with MCU

    Hi Friends, Here I am attaching the datasheet of an MCU of STMicroelectronics and a typical pin configuration of a USB 2.0. PA11 and PA12 of the controller are assumed for USB_DM and USB-DP respectively. Can I directly connect those pin to the USB through a series 15R resistor and a TVS Diode in...
  3. TimBav

    How to dim 4.5v fairy light LEDs on a USB supply?

    Hi folks, plea for help. I've wired my daughter's LED fairy lights to a USB-2 supply, but now they're much brighter than the 3 AA batteries made them (and we quite preferred when the batteries were half flat), so I've been trying to find a variable resistor to put in series to reduce the...
  4. P

    Panel mount female USB B to PCB (two grounds on Panel mount)

    Hello, I'm making a controller for PC. I have purchased the PCB but it is intended for a 4 pin USB connection. My panel mount female USB type B socket has 5 wires and two grounds for some reason... Is there special need to ground in two places or can I simply solder both black ground pins to...
  5. Villanut

    USB2517 unable to enumerate

    Hi ! I've made an usb hub pcb using a USB2517 controller but it's not working. When I plug it in the host computer I get a "not recognised" on Windows and "unable to enumerate" on Linux message. I'm not able to identify the problem. The USB2517 seems to power on at first (current consumption...
  6. Benzine

    How to add an USB hub to an existing circuit ?

    Hi everyone, I was looking for answers on google and stumbled upon this forum so I figured I might aswell directly ask my questions here =) I'm trying to mod a Guitar Hero controller (RedOctane Xplorer for Xbox 360) and part of what I wanted to do was adding a usb HUB inside the controller to...
  7. Macoleco

    How to configure a chip using UART-USB?

    Hi, I am using a USB-UART device (more specifically the Foca v2.2, FT232RT) to configure a Thorlabs chip (MTD415TE temperature controller), but I have no idea how do it. The chip's datasheet says to use commands such as "m?" to "Reads the version of hardware and software", or "Wx" to "Sets the...
  8. M

    USB Charger Circuit - Initial Consumption Before Power Negotiation - Timing?

    Hello, I have a voltage regulator (switching & boost regulator) who's output voltage is being set/controlled by a microcontroller. I can set the output voltage to anything between 4.5 volts and 6.5 volts. Under normal operation, the voltage is always going to be between 5.2 volts and 6.5 volts -...
  9. Mrunje96

    How to handle multiple LEDs on usb device

    Hi, im curious how to handle ,lets say 20-30, LEDs that could draw max 60mA each on USB device. As i know usb port could deliver about 0.5A and those used in full(white color) draw around 1.2A+ ... This question is about power not how to connect them. What is the trick to use them lets say all...
  10. J

    LDO crash when Lipo reaches full charge with USB still powering.

    Hello, I'm just now getting into creating PCB's as a hobby, and created a little board that simply consists of a BLE module powered by a tiny Lithium polymer battery (40mah). Since the max operating voltage of the module is 3.6V, I also have an LDO that will drop the voltage down to 3.3V...
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