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'Sonar sources'
1996\04\29@175252 by Daniel Holt

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Does anyone out there know of a current source for the sonar sensors
built into the old instant cameras.  I am interested in using a PIC to
create a rangefinder that will 'see' at least 30 feet.   Thanks.

---
Daniel Holt
spam_OUTholtTakeThisOuTspammail.sdsu.edu

1996\04\29@232341 by Ben L Wirz

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Daniel,

       As a coincidence, I just did a Bulk Buy of the Polaroid Sonar
modules and have several extras in stock.  They have a range of 6" to 35
ft, and would quite easily interface with a PIC.  I plan to create a PIC
controlled array of 5 Sonar Modules for my robot.  Please see my WEB page
for more detaisl, the address is in my Sig.

Ben,

Ben Wirz                Check out My Home Page for Great Deals on Bulk Buy's
                       Nitinol Wire, LMD 18200 H Bridge and 10 Mhz PIC 16C84
.....blw2KILLspamspam@spam@cec.wustl.edu      http://cec.wustl.edu/~blw2/index.html

On Mon, 29 Apr 1996, Daniel Holt wrote:

> Does anyone out there know of a current source for the sonar sensors
> built into the old instant cameras.  I am interested in using a PIC to
> create a rangefinder that will 'see' at least 30 feet.   Thanks.
>
> ---
> Daniel Holt
> holtspamKILLspammail.sdsu.edu
>

1996\04\30@093539 by Bruce Bowling

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~ Does anyone out there know of a current source for the sonar sensors
~ built into the old instant cameras.  I am interested in using a PIC to
~ create a rangefinder that will 'see' at least 30 feet.   Thanks.
~
~ ---
~ Daniel Holt
~ .....holtKILLspamspam.....mail.sdsu.edu
~
It just so happens I posted the following question on sci.electronics.design
yesterday (with no responses yet) - maybe someone here can help with this
question:



--------------------------------------------------------------------------------
-
Post to sci.electronics.design:

I have been playing with the Polaroid Ultrasonic Rangefinder
module, and have been having a problem.  I got the rangefinder
module from an old Polaroid camera, hoping that what they use
in the cameras were the same as what is available as experimenters
boards.

I have a schematic for the experimenter board, and it is identical
to the camera board, except that the connector pinout is different,
and the schematic uses a TL851 IC, but the board uses a SN28888.
I assume these are identical parts (?).  I traced the schematic
against the board to determing the pinout on the camera board.

On the board, I am using a simple interface with INIT and ECHO only.
BLNK and BINH are grounded, and I have a pullup resistor on the ECHO output.

The *problem* is that I can only get the unit to put out one range pulse,
and then have to cycle the power to get it to put out another pulse.
My sequence is:

1) Make INIT input low, Turn on power. Wait 0.5 seconds
2) bring INIT high
3) wait for ECHO to go high to get range.
4) 0.5 seconds after I set INIT high (#2 above), I set INIT low
5) wait for 0.5 seconds with INIT low,
6) go to (2) above.

Steps 1 thru 5 work, but I cannot get the rangefinder to recycle for
second and subsequent pulses.  What am I doing wrong????????

- Bruce
-----------------------------------------------------------------------------


Thanks for any input - Bruce


--
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<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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              Bruce A. Bowling
 Staff Scientist - Instrumentation and Controls
The Continuous Electron Beam Accelerator Facility
   12000 Jefferson Ave - Newport News, VA 23602
                (804) 249-7240
               EraseMEbowlingspam_OUTspamTakeThisOuTcebaf.gov
       http://devserve.cebaf.gov/~bowling
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<<<<<<<<<<<<<<<<<<<<<<<>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
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1996\04\30@104015 by terogers

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Bruce Bowling wrote:

> I have been playing with the Polaroid Ultrasonic Rangefinder
> module, and have been having a problem.  I got the rangefinder
> module from an old Polaroid camera, hoping that what they use
> in the cameras were the same as what is available as experimenters
> boards.
>
> I have a schematic for the experimenter board, and it is identical
> to the camera board, except that the connector pinout is different,
> and the schematic uses a TL851 IC, but the board uses a SN28888.
> I assume these are identical parts (?).  I traced the schematic
> against the board to determing the pinout on the camera board.
>  Bruce:

You have identified exactly the problem. The chip on your board is a one
shot deal and is different from the chip provided on the OEM ranging
module. You must power down in between shots.

The OEM board works as you expect; one shot per init pulse.

Tom Rogers   VP-R&D   Time Tech, Inc.

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