what is the distance that LDR sensor can detect ( what is the distance between LDR sensor and the object that make the LDR change its status) what is the distance that LDR sensor can detect ( what is the distance between LDR sensor and the object that make the LDR change its status) what is the distance that LDR sensor can detect ( what is the distance between LDR sensor and the object that make the LDR change its status) Solution LDR means ligjt dependent resistors, its having resistance and it is changes when light is falling.. The light itensity is the inversely propotional to square of the distance from the light source. That is, E=1/r^2. here r is the distance between them.