An ultrasonic rangefinder design, including program and schematic, you can download the reference, I hope some help

123456\插图
......\....\图17.4~5 超声波测距.SCHDOC
......\....\第17章.PRJPCB
......\....\第17章.vsd
......\程序
......\....\daoche.xmp
......\....\ocm4x8c.c
123456

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