利用超声波传感器与AT89C51单片机来进行液体流量测量。一、 超声波发射电路：二、 超声波检测接收电路三、 流量显示电路四、 超声波测量流量应用仪的工作原理：-The use of ultrasonic sensors with AT89C51 single-chip for liquid flow measurement. First, ultrasonic transmitter: the Second, ultrasonic detection circuit to receive th

使用孔板测煤气流量汇编的程序。本程序是使用7位数码显示，可以显示瞬时流量，实时压力，实时温度及累计流量。-Gas flow measurement using orifice assembly process. This procedure is to use 7-bit digital display, can display instantaneous flow, real pressure, real-time temperature and accumulated traffic.