Step 3: Okay. Let's crack open the motion sensor and have a look see...
Well, I labeled everything. The photocell (not shown, but trust me, it's there) is to prevent the light (LED) from coming on during the daytime, and therefore prolongs the battery life.
The Fresnel lens is there to provide a wide field-of view for the motion sensor. Fresnel is pronounced frie-nel, look it up on Wikipedia for more info.
The Fresnel lens is there to provide a wide field-of view for the motion sensor. Fresnel is pronounced frie-nel, look it up on Wikipedia for more info.
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