I am using a 2009 iMac with a arduino uno R3. I purchased the board off eBay, and followed all the directions to use the programmer. I can get my Sanghololu board to connect to my arduino, but when I connect my uno to the computer the serial port goes away and all that I am left with is bluetooth. Ho do I get the board to connect to the computer correctly? I am using a Yellow Arduino R3 with the older style DIP ATmega328P chip changed to flat package chip. It also uses a CH340 USB-to-serial interface chip instead of a 16U2. Any help will be appreciated.
What you describe is some clone version of an R3. Arduinos were never yellow nor did they use CH340 as the USB/Serial interface. And where does Bluetooth come in?
'328P in DIP is still the current form factor.
bnoggle:
It also uses a CH340 USB-to-serial interface chip instead of a 16U2. Any help will be appreciated.
You need to find and install the CH340 driver for your OS. I'd try a Google search.