I am using a 3rd party Arduino board made by Stensat (from their experimenters kit). The documentation that comes with it says that in the Arduino environment, the board that should be selected is the ATmega328 5V.
I cannot, however, open the serial monitor in my program. It gives me the error message "Board at COM3 is unavailable." I have not had a problem using the serial monitor before in other sketches but now it's not working. I can't even select what port to use; the option is grayed out. I checked and made sure that the board I have selected is correct as well. Please help!