I bought a digispark off of eBay for $3 dollars but have had no luck uploading sketches to it. When i try to select the port it only gives me bluetooth ports. I heard that the usb ports on MacBooks are sunk in too much for the digispark to make contact? So i tried using an extension lead with no success. I'm sure its something simple because my teacher had the same problem but has got it working now with a new computer.