Activating a door bell inside apartment after motion sensor outside detects movement
There are 120 volt single stroke bells. These ring once when the circuit is completed.



This bell would need to be wired in parallel with the lights that the motion sensor controls. Simply add the the bell's hot lead to the black wire that carries the switched hot from the motion detector to the light (both light and bell will be connected to this wire). Then connect the bell''s neutral to the neutral feeding the light (again, both bell and light will be attached to the neutral). 

When the motion sensor triggers the lights, it will also trigger the bell to ring once.

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