5) Use it!
Now that you know how to trigger a cacophony with an XBee radio, take a look at our input tutorials for activation ideas. Just be sure that the the transmitter’s address is set as the receiver’s I/O input address setting (ATIA). The video above was made with a pushbutton switch acting as a direct remote control. You can also hook up to the XBee Internet Gateway to fire off monkey madness from anyplace on the Internet.
For an escalating alert why not start with a scent, and then move to a light? After that if your stock is still going down, or your freezer temperature is still going up, then let loose with a primate performance that is certain to seize attention!