Im using arduino nano but im facing error like cannot set com state

Official Hardware Nano Family Classic Nano
1

how to resolve this i tried two different board and also two different cables

avrdude: ser_open(): can't set com-state for "\.\COM5"

2

Are you sure that this is the port of the Nano?

3

What do you see with these?
IDE >> Tools >> Port >> (your port)
IDE >> Tools >> Board >> (your board)
IDE >> Tools >> Processor >> Atmega328p
or for Nano with CH340 driver (and the board support package installed)
IDE >> Tools >> Processor >> Atmega328p (old bootloader)

4

Hi, @retro1210
What OS are you using>

What version IDE are you using?

Thanks.. Tom.. :grinning: :+1: :coffee: :australia:

5

Exactly the same thing happened to me yesterday when I plugged in a Nano clone bought on Aliexpress.

The solution for me was as described by @xfpd. Selecting the old bootloader option fixed it for me.

Ignore this - I was likely having a senior moment ..... :grinning:

6

I know that you know your stuff :wink: Was that indeed the "set com-state" error?

7

I've seen more reports recently; they always involved the CH340 TTL-to-USB converter. If your board indeed has the CH340, one solution that was mentioned was to re-install the driver.

For the record, which Windows version are you using?

8

Well that's strange. I can't reproduce that error message again simply by selecting the standard ATmega328P processor option. Now I have the usual "programmer is not responding".

I wonder if I did indeed download newer CH340 drivers and blanked that memory due to uttering various 4-letter incantations!

9

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