First of all I'm a beginner. I wanted to make a project that will automatically turn off fan when there is no person around using IR, Relay and Arduino, is this possible?
Please help me step-by-step, thanks :).
Basically, yes.
Google is a wonderful tool for finding inspiration, if you use it.
For detecting something "around", PIR is often used.
To detect non moving person "around" you need mmWave presence sensor.
IR will not be the best. Sunshine changes might make trouble.
Motion detection or distance checking might be better depending on the shape of the area being watched.
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