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+---- Thread: automatic door opener (/showthread.php?tid=54951)
automatic door opener - balasubramani - 10-04-2017
the idea suggested by sa4eed
This project is making an automatic door, which uses ultrasonic
frequency. generated by a ultra sonic module. and here didn't used any
micro controller. but used comparator to compare the voltage from the
ultrasonic receiver after reflecting. The comparator output s taken to
logic gates. and used a servo motor to open the door.