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.

 

Verify you have the correct package

 

Thanks for your answer , yes I verified the package , it's ch340c

 

hi ali,
I guess you may have already tried these fixes.
https://learn.sparkfun.com/tutorials/how-to-install-ch340-drivers/all

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hi ali,
I guess you may have already tried these fixes.
https://learn.sparkfun.com/tutorials/how-to-install-ch340-drivers/all

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Thank you for your answer.
Yes I tried it , I installed the driver on two PCs ( windows 10 ) but they didn't detect the board. There is no Com port detected in the device manager.

 

hi,
OK,
Under Devices > View > Hidden Devices... does it appear on that listing.?
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hi,
OK,
Under Devices > View > Hidden Devices... does it appear on that listing.?
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No, unfortunately it doesn't appear on the list

 

Have you probed for 3.3v on the board? It’s possible you have a bad solder joint. Please post a picture of your board.

 

hi ali,
Have you compared your CH340 connections to a regular Arduino Uno.
Are you using a 32bit or 64bit PC.?
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BTW: What is connected to X1 X0 on the CH340.???

Added CH340 d/s

 

I compared it to the Wemos LOLIN D32 Pro schematic.
Arduino Uno use the ch340g and 5v to power it . In my case , I use the ch340c (It doesn't require an external Oscillator) and 3.3v to power it.
I use 64 bit PC.

 

hi ali,
Read this link. note the reference to the V3 pin...
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https://github.com/UnfinishedStuff/CH340C

Clip:

 

It is mentionned in the datasheet that the decoupling capacitor 0.01 uF should be connected to V3 only when it is powered with 5v.

 

Have you probed for 3.3v on the board? It’s possible you have a bad solder joint. Please post a picture of your board.

the board have been manufactured by jlcpcb. I probed for 3.3v everything seems okay and the ch340c is powered up but the Pc don't detect it.

 

check all the solder joints with a meter. I’ve had some boards fail from poor reflow.