采用c语言完成了超声波通信系统，通过采用半双工的收发模式，实现两个超声波系统的收发，采用键盘模式发送短信或者字符，通过液晶显示发送端和接收端是否一样-C language using ultrasonic communication system is completed through the use of half-duplex transceiver mode, both send and receive ultrasound system to send text messages us