Okay guys, I'm in a bit of a pickle here. I have the following circuit:
As you can see, pin 3 is my only output. I've actually already had this board printed, so there's not much room for modification. I'm taking a reading from an analog pressure sensor, doing an A/D conversion and then I want to send that value to an Arduino. Is there ANY way I can send this over just pin 3? If so, how? If not, can someone give me a quick SPI or Bit Bang code example? I'm using a PIC12F675.
Edit: Here's a link to the full size image.