关键词
红外发射;红外接收;单片机
Abstract
In this paper, the principle of infrared emitter and receiver has been introduced as well as its characteristics, and a simple circuit of its application has been presented. A simple infrared remote-control alarm circuit based on the single-chip microprocessor of AT89C51 has been designed. The infrared ray has the advantages of low cost, controllable transmission range and direction, without electromagnetic interference, etc. and has been widely used in various technical fields.