| Summary: | 碩士 === 國立勤益科技大學 === 電機工程系 === 101 === LED has the advantages of small, low power consumption and long lifecycle. Due to the increase of illumination efficiency, it has been adopted to car headlights. And this thesis is to describe how high power light level simulates car headlights and to save the energy in a intelligent controls way. Through distance sensor to measure the distance between vehicles, the light brightness is gradually adjusted based on the distance between cars. This system has adaptive front-lighting system which will not tire the front-car driver’s eyes, besides; it can also efficiently decrease power loss and extend the battery lifecycle.
The system use Microchip microcontroller on control system design, through the ultrasonic sensor, by advancing time the method, the distance measurement between the measuring vehicles. The system is deigned to detect the further distance, using time gain control adjusts every feedback signal gain, this can suppress near-distanced feedback signal saturation phenomenon and enhanced far-distanced feedback signal amplitude. In addition to, through dynamic reference voltage comparison methods controls trigger signal, achieve the long-range detection capability.
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