Re: ultrasonic distance measurement using 89c51

I'd guess your biggest difficulty is going to be with your minimum
distance. It's going to be difficult to separate sensing the chirp
echo from the chirp itself at that distance. If you were to change
your specs to, say, 4" to 100", it will be a pretty simple project.
the short distance problem can relative simply be solved,
by a piece of cardboard, foam or whatever blocks sound,
place it in such a way,
so half of the soundwave has travel distance x,
and the other half of the wave has distance x + half wavelength.

cheers,
Stef Mientki
.

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