a common complaint about local universities

(1)The automatic opening and closing of the door is cheap and the elevator is cheap.
(2)It is installed in front of it, so it frequently repeats unnecessary opening and closing operations. In addition, the electromagnet of the opening and closing device is ONOFFed at the maximum output, making the sound of the latch hitting very loud. This phenomenon is more painful than the noise of the washing machine because it repeats at bedtime, so we need to take action quickly.
(3)For example, you can change the electromagnet’s strength for a long enough time to reduce the impact on the latch and buffer it to reduce the impact. In addition, to prevent repeated movement of the sensor, use a better one than the PIR sensor to prevent frequent opening and closing operations, and exclude the sensor’s installation location detection range in front of the elevator.
(4)KAIST Hwaam Living Center