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A real-world example of a control system – protecting against intruders A jewellery store uses three main control systems to keep the jewellery they sell safe and secure. These systems are vital to the security of the jewellery and the store heavily relies on them. Their first security control system detects if an intruder enters the store through a door or window. Infrared beams of light are run across each doorway and window. If one of these beams is broken, an alarm will sound and metal bars will close every door and window, trapping the intruder inside the room Their second security control system detects if a window is broken by an intruder trying to enter. The sound of any breaking glass is measured. If the sound of breaking glass is detected, the alarm will sound again.The jewellers' third security control system detects if any of the jewellery glass cabinets are opened by an intruder. The weight of the glass for each cabinet is 5 kg. If any of the glass is lifted up the alarm will sound and the bars will close every door and window. | Quizalize