Control systems can often be improved with the introduction of sensors.

A sensor will take in information from its environment to provide feedback which can then determine an action.

An example of a system with a sensor is a burglar alarm. A burglar alarm may use a motion sensor. The alarm is set off according to the feedback given from the sesnor.   Go to http://home.howstuffworks.com/burglar-alarm2.htm and answer the following questions.   What type of waves are used by the motion sensor? What happens when a person enters the room? What happens if no-one is in the room?

Sensors can sense many things

• Light
• Heat
• Movement (motion)
• smoke
• pressure

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Match the sensors to the appropriate descriptions.