I have already passed the actual test to improve the ultrasonic ranging program on the basis of other people's mistakes, and I hope it will be helpful to you

超声波测距及报警程序
....................\Last Loaded ultrasonic.DBK
....................\Last Loaded 超声波模拟.DBK
....................\Lcd1602.h
....................\main.c
....................\main.LST
....................\main.OBJ
....................\STARTUP.A51
....................\STARTUP.LST
....................\STARTUP.OBJ
....................\ultrasonic.DSN
....................\ultrasonic.PWI
....................\超声波-1602.PWI
....................\超声波-C
....................\超声波-C.hex
....................\超声波-C.lnp
....................\超声波-C.M51
....................\超声波-C.Opt
....................\超声波-C.plg
....................\超声波-C.Uv2
....................\超声波-C_Opt.Bak
....................\超声波-C_Uv2.Bak
....................\超声波模拟.PWI

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