🚀 go-pugleaf

In article <8455@aero.ARPA> marken@aero.UUCP (Richard Marken) writes:
>I would appreciate information regarding use of the Polaroid camera's
>ultrasonic sensor as a digital yardstick. I recall reading an article
>on how to build such a device -- the article appeared about 3 years ago 
>in Byte or Radio Electronics. Does anyone recall seeing such an article or
>have some recommendations regarding where a schematic could be obtained?

There was such an article in the "Circuit Cellar" column of Byte.  Three
years ago sounds about right.

A couple of years before that, the same column added a Polaroid ultrasonic
rangefinder to a light sensor and parabolic mirror arrangement mounted
on a stepping motor.  That one was probably entitled "I've Got You In My
Scanner".

I have the issues at home, in a pile awaiting construction of a homebrew
unit of similar ilk.

I would discourage use of the Polaroid unit in hacker applications because
it is quite expensive.

A cheaper alternative is the LM1812 chip.  Data is available in National
Semi's analog databook.

I'll post more info tomorrow.