Party organizer from programming, ultrasonic sensor. Function study of the ultrasonic sensor. By counting the number of people coming in and out through the door, and the Arduino MEGA 2560 per circuit to control and test the on - off automatic To be able to count the number of people in and out of the room by the study. The ultrasonic sensor can be used to count the number of people in and out. Fire can be opened automatically when someone enters the room and closed automatically when no man is inside the room.
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