Propagation of sound in the medium is defined as the longitudinal wave. When the sound waves by the large size of its wavelength blocking occurs when the object reflected, the reflected wave is called echo. If the sound wave propagation speed in the medium is known, and the sound from a sound source reaches the target time and then return to the sound source can be measured, then you can calculate the distance from the sound waves to the target. This is the measuring principle of this system. This sound wave propagation medium is air, the use of ultrasound is not visible.

超声波测距模组V2.0\Demo Code\ultrasonic_long\DataOS_A.asm
..................\.........\...............\Device.env
..................\.........\...............\hardware.asm
..................\.........\...............\hardware.h
..................\.........\...............\hardware.inc
..................\.........\...............\IRQ.c
..................\.........\...............\isr.asm
..................\.........\...............\key.asm
..................\.........\...............\main.c
..................\.........\...............\Makefile
..................\.........\...............\Passpoint_Register.txt
..................\.........\...............\Passpoint_Result.txt
..................\.........\...............\Resource.asm
..................\.........\...............\Resource.inc
..................\.........\...............\S480.h
..................\.........\...............\s480.inc
..................\.........\...............\sacmv26e.lib
..................\.........\...............\SPCE061A.h
..................\.........\...............\SPCE061A.inc
..................\.........\...............\Speech.c
..................\.........\...............\ultrasonic_App.c
..................\.........\...............\ultrasonic_App.h
..................\.........\...............\ultrasonic_long.env
..................\.........\...............\ultrasonic_long.h
..................\.........\...............\ultrasonic_long.lik
..................\.........\...............\ultrasonic_long.opt
..................\.........\...............\ultrasonic_long.rc
..................\.........\...............\ultrasonic_long.set
..................\.........\...............\ultrasonic_long.spj
..................\.........\...............\voice\0.72k
..................\.........\...............\.....\1.72k
..................\.........\...............\.....\2.72k
..................\.........\...............\.....\3.72k
..................\.........\...............\.....\4.72k
..................\.........\...............\.....\5.72k
..................\.........\...............\.....\6.72k
..................\.........\...............\.....\7.72k
..................\.........\...............\.....\8.72k
..................\.........\...............\.....\9.72k
..................\.........\...............\.....\BEGIN.72k
..................\.........\...............\.....\CHECK.72k
..................\.........\...............\.....\DOT.72k
..................\.........\...............\.....\ERROR.72k
..................\.........\...............\.....\ERRORS.72k
..................\.........\...............\.....\M.72k
..................\.........\...............\.....\MEASURE.72k
..................\.........\...............\.....\PUSH.72k
..................\.........\...............\.....\RESULT.72k
..................\.........\.............w\DataOS_A.asm
..................\.........\..............\Device.env
..................\.........\..............\hardware.asm
..................\.........\..............\hardware.h
..................\.........\..............\IRQ.c
..................\.........\..............\isr.asm
..................\.........\..............\key.asm
..................\.........\..............\main.c
..................\.........\..............\Makefile
..................\.........\..............\Passpoint_Register.txt
..................\.........\..............\Passpoint_Result.txt
..................\.........\..............\Resource.asm
..................\.........\..............\Resource.inc
..................\.........\..............\S480.h
..................\.........\..............\s480.inc
..................\.........\..............\sacmv26e.lib
..................\.........\..............\SPCE061A.h
..................\.........\..............\SPCE061A.inc
..................\.........\..............\Speech.c
..................\.........\..............\ultrasonic_App.c
..................\.........\..............\ultrasonic_App.h
..................\.........\..............\ultrasonic_low.env
..................\.........\.....

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