Mouse in the House
This is the test-tube version of our Mouse in the House invention. The way it works is that a laser is directed into a light sensor, and when the light is broken it automatically sends you a text message saying that something passed through the light.
The project uses an Arduino with a wifi shield so that the trip-wire does not need to be connected to a computer. We are using a service called Temboo that delivers a message from the Arduino to your phone when something passes in front of the light.