Ultrasonic generator internal structure has two piezoelectric chip and a sounding board. When it is applied bipolar pulse signal having a frequency equal to the natural oscillation frequency of the piezoelectric wafer when the piezoelectric wafer will resonate and drive plate vibration resonance, it generates ultrasonic waves.

HC-SR04-stm8s\Debug\Exe\HC-SR04.hex
.............\.....\...\HC-SR04.out
.............\.....\List\HC-SR04.map
.............\.....\....\main.lst
.............\.....\....\main.s
.............\.....\....\TM1628.lst
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.............\.....\Obj\HC-SR04.pbd
.............\.....\...\main.o
.............\.....\...\TM1628.o
.............\HC-SR04.dep
.............\HC-SR04.ewd
.............\HC-SR04.ewp
.............\HC-SR04.eww
.............\main.c
.............\settings\HC-SR04.cspy.bat
.............\........\HC-SR04.dbgdt
.............\........\HC-SR04.dni
.............\........\HC-SR04.wsdt
.............\TM1628.c
.............\TM1628.h
.............\Debug\Exe
.............\.....\List
.............\.....\Obj
.............\Debug
.............\settings
HC-SR04-stm8s

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