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'16C84 StandAlone Sonar'
1997\11\30@002948 by jrswedd

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Hi All,

Can the 16C84 Pic Chip be made into a Standalone Sonar System??
Has this subject been brought up before??
I have an idea, but i don't know if it would work.

             16C84
     pin 1>  .----.
             .    .
             .    .  ..........Data Line......>
             .    .  .
             .    .  .
    ..........    .  .      Transducers 1=2           +
    .  .......    .  .                                +
    .  .     .    .  .         ...2                   +
    .  .     .    ....     ..... .<<<<<<pause rec.<<<<+ W
    .  .      ----         .   ...                    + A
    .  .....................                          + L
    .                           ...1                  + L
    ............................. .>>>>>>>pause out>>>+
                                ...                   +
                                                      +
                                                      +


 And I would need a program, how would i start it???

                            thank you for your help
                                     Jim
                             spam_OUTjrsweddTakeThisOuTspamici.net


'16C84 StandAlone Sonar'
1997\12\04@134454 by John Piccirillo
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>Can the 16C84 Pic Chip be made into a Standalone Sonar System??
>Has this subject been brought up before??
>I have an idea, but i don't know if it would work.


Don't see why not.  I have something similar to this breadboarded and it
works fine, for my requirements.  The transmitter/receiver transducer pair
costs about $ 3.50.  However, you may need a few more parts, especially to
drive the transmitter.  I paralleled several gates from two CMOS 4049
inverters and drove the transmitter lines in opposite phase, conveniently
arranged with an inverter gate, like so:

                     |\
                 |---| xo--+
          |\     |   |/    |
 PIC--+---| xo---+         |------------+
      |   |/     |   |\    |            |
      |          |---| xo--+            |
      |              |/                 |
      |                               sonar
      |                              transmitter
      |                                 |
      |             |\                 ___
      |         |---| xo--+            ___    small cap.
      |         |   |/    |             |
      +---------+         |-------------+
                |   |\    |
                |---| xo--+
                    |/


Only where you see two inverters paralleled there are really 5!  This gives
nearly a quarter of an amp available per pulse and the range is about 14
feet, for good reflectors.  I used another PIC line to transmit the
distance, or elapsed instruction cycles, to an LCD for display.  Also, you
need some op amps on the receiver to amplify and detect the return.  I used
a quad Op Amp package, TL074 I think.  One more thing.  The transducers are
rated for 12 volts, so I used a couple of transistors to convert the PIC 5
v. out to 12 v. for the drivers, and to convert the receiver pulse from 12
v. back to 5 v. for the PIC.
   Since only a few pins are needed, one of the 8-pin PICs would be all
that's needed to receive a serial input commanding the sonar on, the
transducer interfaces, and a serial out to capture the distance measured.

>  And I would need a program, how would i start it???

   I ping the transmitter for 7 cycles at 40 kHz, set by appropriately
scaling the PIC timer, than wait for a return.  During the wait, the PIC is
in a loop and increments a counter.  The return signal causes an interrupt
which terminates the loop.  The timer is also used to establish a max time
out, in case no return is received.  It's been a few months  since I fooled
with it, if you're interested I'll check the details.


John-


'16C84 StandAlone Sonar'
1998\12\05@011521 by Bob Wake
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Hi All,
>
> Can the 16C84 Pic Chip be made into a Standalone Sonar System??
> Has this subject been brought up before??
> I have an idea, but i don't know if it would work.

Microchip has an app note I think it's AN597 all about using the PIC to control
a Polaroid Ultrasonic ranging system.
A more simple way of doing it is by some guy at a site called wizard.org. He us
es cheap transducers and even provides the schematics and code!

-----
See the original message at http://www.egroups.com/list/piclist/?start=16907

1998\12\05@130635 by Michael J. Ghormley

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Bob Wake wrote:
>
> > Can the 16C84 Pic Chip be made into a Standalone Sonar System??
> > Has this subject been brought up before??
> > I have an idea, but i don't know if it would work.
>
> Microchip has an app note I think it's AN597 all about using the PIC to contro
l a
> Polaroid Ultrasonic ranging system.
> A more simple way of doing it is by some guy at a site called wizard.org. He u
ses
> cheap transducers and even provides the schematics and code!

Don't forget Paul's Cheap Sonar at:
       http://www.hamjudo.com/sonar/

and the Serial Sonar Unit (SSU) at:
       http://www.pacificnet.net/notesguy/

Michael

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Men must learn to pretend to be wise and good.  --  Lao Tzu
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