Re: ultrasonic distance measurement using 89c51

On Feb 4, 5:08 pm, Stef Mientki <S.Mientki-nos...@xxxxxxxxxxxxxx>
wrote:
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

Hi, Stef. Underpromise, overperform. I'm thinking the OP might be
looking at doing a school project. As a practical matter, it is
usually difficult to get close-in measurements with standard send/
receive 40KHz transducers. I'm hoping he can tweak his project spec
to make things easier for himself.

But if not, it's not outside the realm of possibility, as you
mention. It's just more difficult. Class projects should be
straightforward if at all possible.

Cheers
Chris

.

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