Hi. Since Arduino only has one usb and the bootloader used it to listen for sketch upload. Is there any smarter bootloader, so my pc program can send something to my sketch using that usb-virtual-com-port? thanks
Send what?
If you want to send data, no problem.
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You can send the data directly to the sketch, the bootloader is not needed for this.
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sorry guys, i was stupid, i can communicate via Serial.write() and pc program can get it.
Your PC program also can send data, and arduino will receive it with Serial.read()
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