LED （发光二极管）作为一种新型光源，具有高效节能、绿色环保、使用寿命长等其



他光源无法比拟的优点，代表着未来照明技术的发展方向。本文设计了一种以AT89S51 单



片机为核心的家用多功能白光LED 台灯系统，采用PT4115 大功率LED 恒流驱动方案，可



实现对LED 台灯的PWM 多级调光控制；同时，系统兼有时间日历、温度检测、液晶显示、



声光闹钟等多项功能。本文详细给出系统的硬件与软件设计过程。实验证明，该多功能LED



台灯稳定高效，功能丰富，能够满足家庭实际应用的要求。-LED (light emitting diode) as a novel light source, with high efficiency energy saving, environmental protection, long life and other sources can not match the advantages of lighting technology represents the future direction of development. This paper presents a AT89S51 microcontroller to function as the core of the home white LED lamp system, using high-power LED constant current driver programs PT4115, LED lamp can be realized multi-level PWM dimming control　the same time, the system both time calendar, temperature measurement, liquid crystal display, sound and light alarm clock and many other features. This article details the hardware and software design process. Experiments show that the multi-function LED lamp stable and efficient, feature-rich, practical applications to meet the requirements of the family.