hello I am a new user of Arduino
I wonder if it is possible thanks to a presence detector, to start a program when a person passes the sensors in an area Delimited
sorry for my english (I'm french)
If possible, could someone explain to me how you?
thank you very much
A PIR (Passive Infrared) sensor will detect the motion of warm bodies, typically humans.
An ultrasonic sensor will detect the distance to an object.
A laser tripwire will detect a object blocking a laser beam.
If none of those are sufficient individually you might want to combine them.