I have tried to make the folllowing project
The error message is
Sketch uses 3302 bytes (10%) of program storage space. Maximum is 32256 bytes.
Global variables use 71 bytes (3%) of dynamic memory, leaving 1977 bytes for local variables. Maximum is 2048 bytes.
avrdude: ser_open(): can't open device "\.\COM3": The system cannot find the file specified.
Can you help me?