Read the Analog Inputs — MakingThings: "Autosend
First, choose whether you want the Make Controller to send messages to you over USB or Ethernet. If you want Ethernet, send it the message
The board will send messages wherever it last received a message from. If you want USB, send the message
Next, decide how often you want the Make Controller Kit to send you messages. We'll have it look every 10 milliseconds, or 100 times a second. To do this, send the message
Lastly, turn the analog inputs autosend on. We'll turn on autosend for all 8 of the analogin channels by sending the message
Now, anytime the value changes on one of your inputs, the Make Controller will send you a message. Read on below to see how to deal with the incoming messages."