Invisible port Com even with Ch340 drivers - Leonardo

Development Tools IDE 1.x
1

Hi everybody,

I met problems to see the Port of Leonardo board in IDE, impossible to see it.
I have install CH340 Drivers.
I have also a Mega 2560 and I can see the port and configure it without problems.

Thanks for help.

2

The Leonardo does not have a CH340 (nor any other TTL-to-USB converter). It uses native USB built in the processor.

Start by the beginning: the IDE will not see the Leonardo if the operating system does not recognise it. So the question is if the operating system recognises it?

A very common problem is the the micro-USB cables cone in two flavours, charge-only cables and data/sync cables. So you might be using a charge-only cable if your ooerating system does not recognise the Leonardo. Try different cables, ones that are used to connect cellphones to computer for data transfer should work; buy one if not sure.

Questions in case different cables don't solve the issue

  1. Which operating system are you using?
  2. Does the L-LED fade in and out when you double tap the reset button on the Leonardo?
3

Hi, thanks for answer.

I think the wire is good, it's a new one and the packaging indicate it's for data not for only charging.

I'm under Windows 11
When it's plug to the PC, the On led is green and the L led blink in yellow slowly, When I press reset L led blinking fast.

4

So what does Windows device manager think of your board? Any yellow triangles / error indications when you connect the board?

I said "double tap" the reset button :wink: Try again. Also observe what happens in Windows device manager when you do the double tap reset.

5

I can't see the device in device manager. When I double tap it's the same the led blink fast and continue slow, nothing happen in device manager.

Something new happen from the begining. Now I can hear a sound from windows when I plug the board, like with my mega 2560. When I unplug it windows send a notification: USB device not recognize.

6

Fast blinking should not happen as far as I know. It should slowly fade in / out for 8 seconds. After that it should run the loaded sketch; I think that the "continue slow" that you mention is the blink sketch.

Is this a new board? Or did you use it before? If it's a new board, ask for a replacement.

The only other advice that I can give is to burn the bootloader using a programmer or your Mega.

7

Ok, I solve the problem.
I try the wire on a mac and it's working, I can see the board. With the PC I try an other wire plug in USB-C and it's working. I don't know if it's comming from USB-A from my PC or if the cable not working with my PC.
Conclusion: Try several wires or/and different kind of plug. A new and clean wire might don't work...

8

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