7400 QUAD 2-INPUT NAND GATES 与非门 7401 QUAD 2-INPUT NAND GATES OC 与非门 7402 QUAD 2-INPUT NOR GATES 或非门 7403 QUAD 2-INPUT NAND GATES 与非门 7404 HEX INVERTING GATES 反向器 7406 HEX INVERTING GATES HV 高输出反向器 7408 QUAD 2-INPUT AND GATE 与门 7

主要由单片机系统及显示电路、超声波发射电路和超声波检测接收电路三部分组成。采用STC89C51来实现对CX20106A红外接收芯片和7404的控制-Mainly by the SCM system and the display circuit, ultrasonic transmitter and ultrasonic detection circuit receiving circuit consists of three parts. STC89C51 to achieve the CX2