The assignment was to create a doorbell by means of ZigBee communication, using XBees, Arduino, a buzzer, and a switch. We explored ways to enhance the interaction by adding a feedback round-trip. In the first iteration we just added a function that we allow the visitor to know that the buzzer has rung by LED light on output. In the second iteration we add an additional nap mode. This doorbell works only for insistent visitors, who will push the switch 5 times in sequence…..

Finally, we create an advanced “doorbell” with practical interaction. Given the growing threats of computers thefts, we decided to create an alert application for computer users at ITP. The ‘doorbell” turned into an alarm set. On one hand of the network there is the Force sensor, which is placed under a computer, once the computer is lifted (an attempt to steal it), it will buzz on the other end – a wireless buzzer box.