Subject:
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Re: RCX Controlled Air Compressor Tester
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Fri, 1 Oct 1999 17:05:57 GMT
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Viewed:
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4428 times
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Michael,
Another great post! You should be in the "LEGO Hall of Fame" along
with Dave Baum and Mark Overmars!
Thanks for your many contributions,
- Nick -
Michael Gasperi wrote:
>
> Larry Pieniazek <lar@voyager.net> wrote in message
> news:37F4B2C6.5A1298B4@voyager.net...
>
> > This is the classic "how do you calibrate the measuring tool if you
> > don't have a standard to start from".
>
> For the development of my pressure sensor I used a digital pressure gauge
> that you can buy for checking tire pressure. ($8.00 at KMart) It requires
> removing the guts from a pistol shaped enclosure and connecting the pressure
> line from the LEGOs directly to the its sensor. The only rub is the sensor
> is designed to measure a peak pressure and hold the value. I had to install
> a pneumatic switch in line with it and keep toggling in on and off to make
> the sensor think it was being pushed up to a tire stem over and over to get
> a near continuous measurement of pressure. The published values for the
> Lucas sensor I used in my circuit and the tire gauge matched up very well so
> I think it is fairly well calibrated tool.
> The testing of my pressure sensor showed that the peak LEGO pressure was
> about 40psi before the little valves in the hand pump seemed to quit
> working. I'm sure you have all pumped the hand pump like crazy and felt it
> kinda give up after a while and make a tiny pu-pu-cushion sound. Sometimes
> tubes blew off also. The Lucas sensor I used is good to 30psi with a 3X
> overload capacity so it is about prefect for the job. I calibrated my
> sensor to read 100 in Light units for 33psi.
> http://www.plazaearth.com/usr/gasperi/pressure.htm
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