I used this website to make my auto light switch and everything works, that is, when you enter the room, the switch turns on, but I don’t know how to make it so that when you leave the room, the light turns off
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Right on that page, it says:
"This can be modified to turn off the light also, but for that, you'll need two ultrasonic sensors to count the people entered the room and how many of them left the room so that it can operate accordingly."
Whilst someone is in the room the sensor can be arranged so it keeps triggering off the person - that can be used to keep the light on .
Just arrange for the light to time out and switch off if no trigger signal is detected .
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