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 comes from a ferrit bead.
View attachment 220379

hiii how are you!!!,
I'm facing the same problem with CH340C, the only difference with yours is tha I'm using "windows 11". so if you have solve this problem will you share with me please!

Mod: link to old thread.
https://forum.allaboutcircuits.com/threads/problem-with-ch340c.173654/post-1562134

 

hello! I am using "CH340C" connected with "DOIT ESP-WROOM-32E" through "UMH3N" to flash my DIY project board. the "CH340C" is powered by 5V(USB) separately. after I inspect my soldering with eye and multimeter for solder bridge and every thing seemed good (no short circuit shown). then when I connect to my PC nothing was shown (not detected) even on the device manager, then when I test the voltage by probing to the GND and VBUS it showed 00.0V, but when I disconnect the USB cable and test the resistance b/n GND & VBUS it shows no short circuit, and suddenly when I was trying another USB cable I measure 5V between GND & VBUS, but the device still not detected on my PC(windows 11). now I troubling to find where the problem is, I'll appreciate to your help. here is my schematic

 

Did you install the driver?

 

yes I install it, and when I click the "uninstall" to verify it shows like this

 

are you sure you are using correct driver? your chip is 340 but chosen driver is 341...
also are you sure you are using correct cable? it need to be data cable, not power cable. power cable only has wires for power but not data lines. also VUSB must be present, if not try another USB port or... another computer.