How to dectect presence/absence of something?

Is it possible to use Arduino to detect the presence/absence of stuff, human, animal, or something else? and how to do it?

Answer

Yes, there are many ways to detect presence/absence. The choice depends on the specific application. The belows show some ways to do it.

Using the force sensor

Using the IR beam sensor

Using the reed switch

Using the GPS module

Using the accelerometer and gyroscope sensor

Using the PIR motion sensor

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