Abstract
In order to intelligentize the LED lighting systems,this system adopts the Freescale series MC9S08AC16 as the controller, senses the light environment induced by the photoresistor and uses the SS-101 pyroelectric infrared sensors to sense the presence of people. In addition, it uses LM3404 chip to drive LED headlamp unit and by changing the duty cycle of PWM to achieve the switches and automatic adjustment of brightness of LED lights. Experiments show that the light source brightness provided by this system is stable and reliable and the combination of infrared sensing technology and PWM technology achieves the intelligence of LED lights. Moreover, it has high application value.
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