user15407: I am working on an Arduino project where I need more digital and analofgpins than the Uno offers. I was wondering how to hook up multiple Arduinos (4) together so I can use their digital and analog pins. Thanks in advance.

user15684: I suggest using a single Arduino Mega.  It offers 54 digital I/O and 16 analogue inputs.
I suppose you could also use I2C or SPI to communicate between multiple Uno's.

15407: <p>I am working on an Arduino project where I need more digital and analofgpins than the Uno offers. I was wondering how to hook up multiple Arduinos (4) together so I can use their digital and analog pins. Thanks in advance.</p>
 15684: <p>I suggest using a single <a href="https://www.arduino.cc/en/Main/ArduinoBoardMega2560" rel="nofollow">Arduino Mega</a>.  It offers 54 digital I/O and 16 analogue inputs.</p>

<p>I suppose you could also use I2C or SPI to communicate between multiple Uno's.</p>
