With the development of electronic

With the development of electronic technology, the lighting tools in people's life are changing greatly. With the deterioration of environmental problems, the reduction of energy, energy-saving Green Table Lamp, gradually into people's lives. Before the use of a single desk lamp, but now people need a multi-functional intelligent desk lamp. Therefore, the use of knowledge to design a multi-functional green table lamp is a good direction. This paper introduces a design of intelligent desk lamp based on PWM dimming. The single-chip technology and PWM dimming technology combined to achieve the table lamp intensity adjustment. That is, without changing the PWM square wave cycle, the use of single-chip microcomputer control PWM duty cycle, thereby changing the size of the voltage to achieve the adjustment of light brightness. When the human body is in the range of the desk lamp and the ambient light is weak, the lamp is automatically switched on, and the brightness of the lamp is automatically adjusted with the change of the ambient light. Once the human body is out of the range of the desk lamp, that is, when the infrared heat release sensor can not detect someone, lights out in one minute. When the body is too close to the desktop, the BUZZER will also issue a warning to correct the sitting posture, to prevent Myopia. The design through the brightness of the automatic adjustment and human detection control desk lamp switch to achieve the effect of green energy saving. At the same time in order to improve the scope of application of this design, but also added to prevent short-sighted distance detection and manual control mode, in manual control mode, table lamp brightness by the button adjustment, so that the table lamp in some special circumstances can also be applicable.