'avrdude: ser_open(): can't set com-state for "\\.\COM3"

I've seen other posts with the same error message, but couldn't find any solution that works for me. I'm using windows 10. I've done all the required steps, but the error still pops up. Please help.

arduinowindows-10arduino-ide


Solution 1:[1]

This error says: another app using COM3 port or on COM3 is not connected device.

You can try:

  • Diconnect and connect arduino
  • Close app using COM3 (if you know)
  • Close serial monitor in arduino ide
  • Check arduino connection
  • Check port, check which port arduino is connected to

Solution 2:[2]

just unplug the micro controller and plug it again

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1 Brambora0
Solution 2 Musab Salimuddin Inamdar

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