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help please to create a digital circuit

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gonajenia

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We want to design a system that sounds a buzzer inside our home whenever motion outside is
detected at night. Assuming we have a motion sensor with output M that indicates whether
motion is detected (M=1 means motion detected) and a light sensor with output L that indicates
if light is detected (L=1 means light is detected). The buzzer inside the home has a
single input B that when 1 creates a loud warning sound. Using AND, OR, and NOT gates,
create a simple digital circuit to implement the motion detector at night system.
 

Jestin_cubetech

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Y= M OR L
M= PIR Motion Detector [active high logic]
L= LDR [active high logic]

 

gonajenia

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In circuit that you give there is only NOT gates. Am I right? and where are the AND and OR gates?
 

gonajenia

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Thanks for your help. And can I ask 1 question?
How can we know that it is the motion detector at night system.?

I know about it a little and I want to understand... please if you can , tell me
 

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