A while back, I ordered an IEIK Uno board. I received the wrong board, the seller didn’t respond, I got a refund and got to keep the board. I have a legit Uno now, and I want to try messing around with I2C. When I try to upload something to the knockoff board, it get an error message that says:
avrdude: ser_open(): can’t open device “\.\COM4”: The system cannot find the file specified.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
The troubleshooting guide doesn’t help. Any suggestions?