Trying to read analog signal with digital pin using outside ADC Is there a way to route an analog signal from a simple temperature sensor through an ADC, MCP3008, into a digital pin. I have used all the analog pins on my Arduino  Mega 2560 and am trying to utilize all the digital I/Os. 

Any insights on the matter would be greatly appreciated.
The MCP3008 is an SPI device. You connect it to the SPI pins of your Arduino. Then you can read 8 analog channels through it.

It requires 4 pins: MISO, MOSI, SCK and a chip select pin.