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You are called in by a building manager who wants to turn his building into a "Smart Building". He

She wants to deploy a number of low-power wireless motes around his her building, and connected to sensors and actuators. He She wants to be able to dynamically (re)configure the interactions between the nodes. For now, he she wants the following interactions:

• if the temperature drops below 20C, the heater switches on; if it above 20C, the heater switches off.

  Info
  You will use an LED to reflect the state of the heating system.

• when someone opens the exit door, the alarm sounds; it stops when the door is closed.

  Info
  You will use an buzzer to reflect the state of the alarm.