That's super.  That a great and simple starting point.  I think that now th=
at I have a USB oscilloscope I can understand it a bit better.  (it's a gre=
at page as well)

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?

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 anoth=
er number or pattern) in order to filter out other noise.=20

Lindy

-----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

I think this article will answer most of your questions:
http://www.micro-examples.com/public/microex-navig/doc/090-u
ltrasonic-ranger.html

You're right about that datasheet. I've never seen one that doesn't even gi=
ve a pinout or reference circuit.

Allen


--=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
.