本设计的指导思想是利用红外发光管发射红外线，红外接收管接收此红外线，并将其放大、整流形成高电平信号.当有人或物挡住红外光时，接收管没有接收到红外信号，放大器将输出低电平，同时将这个电平信号送入单片机进行控制计数，并经译码驱动电路使数码管显示数值。这样就得到要统计的人或物的数量。-The design of the guiding idea is to use infrared emission infrared LED and infrared receiver to receive the infrared control and its amplification, rectification form a line level signal. When there is someone or something to block infrared light, the receiver does not receive infrared control signals, the amplifier output low, while the level control signals into single chip count, and driven by the decoding circuit to digital display value. This will be the number of persons or things to statistics.