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how use ping altrasonic to compute range wih pic16f877a pic16f877a
I would suggest choosing a PIC microcontroller with CTMU. The CTMU is the perfect peripheral for such applications (e.g. measure very short time pulses).
A very good material is at the following link:
http://ww1.microchip.com/downloads/en/AppNotes/CTMU%2001375a.pdf
