automatic headlight beam circuit diagram

[mohammad0932]

I wana know if its possible to get the circuit diagram of automatic dipper for . i want to use Arduino mega 2560 to program the circuit .Im looking for better circuit diagram .
Also Im doing a research base on where is the best place to put the sensor on the car , some of the sensors are located in the headlight some in upper dash panel ,... i wana know if there is any calculation or any theory.. .

thank you