Subject:
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Re: 3-wire converter for homebrew sensors
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 25 Mar 1999 19:37:02 GMT
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Original-From:
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RAJACKSON@QNX.COMihatespam
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Viewed:
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2656 times
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Previously, you (Michael Gasperi) wrote:
> In lugnet.robotics, Dennis Clark writes:
> > Ahh, but the stipulated purpose for Pete's sensor brick is that it gives
> > a _linear_ response that isn't corrupted by the non-linear diode drop
>
> It is a heck of a lot of complexity for a little added linearity. If you look
> at the plots on my general purpose interface section; the simple resistor
> interface is pretty linear. I think most of the nonlinearity in the powered
> version is due to the cheap LM324 I used. A better opamp would produce better
> results.
As for the diode vs FET, the package used for surface mount is going to be the
same so there is no size penalty. The only thing I might change is the regulator,
on battery powered equipment I would tend to a DC to DC converter like Motorola's
MC33463. I guess it's over kill on something that also driving motors though ;-)
> --
> Did you check the web site first?: http://www.crynwr.com/lego-robotics
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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