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An automatic door has a controller, an electrical sensor and a motor. The sensor detects an approach to the door either by the interruption of a laser beam or by a pressure pad. This is set up to send a signal to the controller which triggers the motor on the door which moves the door to the open position. The motor then closes the door after a set time period unless the sensor is re-triggered in that time.

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Q: What makes an atomatic door open atomatically?
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