Subject:
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Re: Ultrasonic Rangefinder
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 22 Sep 1997 05:02:48 GMT
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Original-From:
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Darkman <lroska@IHATESPAMcyberus.ca>
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Viewed:
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1229 times
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Eric Naus wrote:
>
> Hi,
>
> I've used the units out of the Polaroid cameras with no problems.
>
> Do you have the documentation from Polaroid???
>
> It's about 10 pages long (circa 1975) .
>
> I could try to scan them for you if you want.
>
> Leave me your e-mail address.
>
> Bye for Now
>
> Eric Naus
>
>
Hi Eric
> Do you have the documentation from Polaroid???
The answer is no, what I used is the schematic diagram for the
Polaroid 6500 rangefinder board. the circuit is almost identical
exept for a transistor preamp betwen the transducer and the
receiver. The only way I can initiate a ping after receiving an echo
is to power cycle the board. I think that the transmitter IC is
a modified unit custom made for the camera?
I spent aprox 3 Hours experimenting with the board, I built a counter
circuit out of 2 decade counters and gated the clock signal so when I
initiate a ping the counter starts and once the echo is received it
stops. The counter is fed ~533Hz clock signal so the result is
displayed in feet on two 7 segment displays. Pretty accurate.
I would appreciate your effort very much if you can provide
me with the actual documentation!
My email address is lroska@cyberus.ca
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Message has 2 Replies:
 | | Re: Ultrasonic Rangefinder
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| (...) Better yet - can you make this available by ftp or on a web site somewhere? I too have an old autofocus Polaroid camera (can't remember the model) and would like to use the ultrasonic gubbins from it. Thanks Pete (27 years ago, 22-Sep-97, to lugnet.robotics.handyboard)
| | | Re: Ultrasonic Rangefinder
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| (...) Better yet - can you make this available by ftp or on a web site somewhere? I too have an old autofocus Polaroid camera (can't remember the model) and would like to use the ultrasonic gubbins from it. Thanks Pete (27 years ago, 22-Sep-97, to lugnet.robotics.handyboard)
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