摘要
LED做为绿色高效的新一代照明光源应用越来越广,对LED自适应调光技术的需求会更加强烈。本文采用了基于I2C总线的光传感芯片TSL2561的测光技术,以ARM作为控制器,采用PWM方式调节MOS管,达到调节LED的发光亮度的目的,实现了LED的自适应调光。本文完成了相应的硬件设计和软件编程并调试成功,最终能使整个系统具备相应的功能。
LED has aroused world wide interest because of its high efficiency,green and other advantage,and it is applied in many kinds of illuminance situation.LED adaptive dimming technique is needed more strongly.In this paper,the photo sensor chip TSL2561 based on I2C bus was used to measure the ambient illuminance.It used ARM as the controller,and adjusted the MOS in the way of PWM to regulate the lightness of LED.Finally,the ambient illuminance can be maintained at the setting level.The hardware design and software programme is completed in the paper,and LED adaptive dimming system can run successfully.
出处
《现代科学仪器》
2010年第6期48-51,共4页
Modern Scientific Instruments
基金
天津市科技支持计划重点项目(09ZCKFGX02100)
天津高校双五科技计划项目(SW20080006)
