In general, when I look at a schematic I see interconnected
blocks and sub-assemblies. But it depends on what you are
doing and how your own mind best perceives things. When
troubleshooting sometimes it makes more sense to look at
"send" circuits independently from "receive" circuits. It is
a flexible tool which you can usually make fit whatever you
want it to do. You need to try a lot of different views and
find out what makes the most sense to you.

Averaging is frequently a good way to account for noise. In
this case you might also try modulating the signal so you
are more certain that is what you are reading back. Start
simple first. Get it working. If modulation or other things
are necessary add them later.

Allen

> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of Lindy Mayfield
> Sent: Monday, October 21, 2013 3:50 PM
> To: Microcontroller discussion list - Public.
> Subject: RE: [EE] Help understanding how these transducers
> work
>=20
> That's super.  That a great and simple starting point.  I
think
> that now that I have a USB oscilloscope I can understand
it a
> bit better.  (it's a great page as well)
>=20
> When you look at that schematic, how do you make sense
> of it?  Do you start at one point, like the PWM side and
> follow it from one point to the other?  Or do you look at
it in
> blocks or sections that are connected together in certain
> ways?
>=20
> Sometimes simplistic elegance is difficult to understand.
If I
> managed to break it apart into send and receive, would
that
> make more sense to me?
>=20
> I do now understand how it works programmatically.  I send
> a pulse and then measure the time it takes to receive it.
> Perhaps in bursts of 3 (or another number or pattern) in
> order to filter out other noise.
>=20
> Lindy
>=20
> -----Original Message-----
> From: piclist-bounces@mit.edu [mailto:piclist-
> bounces@mit.edu] On Behalf Of Allen Mulvey
> Sent: Monday, October 21, 2013 9:44 PM
> To: 'Microcontroller discussion list - Public.'
> Subject: RE: [EE] Help understanding how these transducers
> work
>=20
> I think this article will answer most of your questions:
> http://www.micro-examples.com/public/microex-
> navig/doc/090-u
> ltrasonic-ranger.html
>=20
> You're right about that datasheet. I've never seen one
that
> doesn't even give a pinout or reference circuit.
>=20
> Allen
>=20
>=20
> --
> http://www.piclist.com/techref/piclist PIC/SX FAQ & list
> archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist


--=20
http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.