LDR in a dimmer circuit? Need advice

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hello, have several questions. possible use ldr in led dimmer circuit? idea ultrasonic sensor senses person , because senses person, light goes in brightness 25% or 50%, , after maybe minute or two, if sensor still detects person within range, brightness goes hundred percent? know potentiometer common in dimmer circuits i'm looking automatically changes brightness level.

and also, possible use smartphone los controller (or imagine remote controller) , detected color sensor?

thank , have day :)

i don't understand ldr come it. can achieved without one.

what sort of lights, mains incandescent or leds?

what los controller?

please read how use forum sticky post information on how ask question here.


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