Hai everyone i have some issue with my arduino nano.
i have install driver CH340 on my pc but arduino nano wont detected on my pc.
so i start press hold reset button on arduino nano and i open Device manager and my arduino detected on Com 7
but if i release reset button my arduino not detect anymore
everyone know whats happen?
What's all connected to your Nano? Is that controlled by the last sketch that you did upload?
yes, everything is controlled through the previous sketch, can you help me with the problem I'm facing?
double tap the reset button.
when i press twice my computer reads usb in, but after that my computer doesn't show usb ch340
So it is just the nano connected via USB cable to your PC and NOTHING else connected to the nano?
only nano nothing else
What is everything? How is it powered?
My suggestion is to disconnect everything and try the upload.
i just plugged the usb cable into my computer and nano didn't read it, but when i press and hold the reset button nano will read on my computer but when i try to upload a new sketch arduino ide is stuck in uploading
That's odd. I can't think of any sketch that could turn off the CH340 on the nano.
Are you using an USB hub? If so, you could try to plug the cable directly in the PC.
I don't use a usb hub, I tried all the usb ports on my computer but I haven't tried to replace the usb cable
btw all led turn on while i plug usb cable to pc
Please answer the question what thatb "evevrything" is. Motors, solenoids,displays .... ?
We know that.
I suspect that something is drawing too much current; it might be the main processor (328P). I would start by measuring the 5V pin under the normal circumstances and when reset is pressed.
Just a guess...Did you try using the "old bootloader" option?
It's my understanding that the board is not recognised (except when it'sin reset). The bootloader has no effect till the board is recognised 
I recall that I had this trouble with a nano and using the old bootloader option solved that. It is possible that the bootloader contains the ID code that the Arduino IDE needs.
Which ID code? VID and PID are in the CH340 and the operating system needs the to use the correct driver. Atmel chip ID is baked in the processor and does not change for a 328P (e.f. Uno vs Nano).
Although the bootloaders are different (I do not know the exact details), one difference is the communication speed (57600 for the old one, 115200 for the new one).
I do not know the details either. I had trouble with a nano, and I got a "song and dance" from my supplier about using a laptop (Oh, too bad) and Windows (Oh, you're using that one, too bad!) so I tried "old bootloader" and it worked. I'm just sharing a suggestion. I think it's worth a try.
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