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 16:16:39 GMT
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Viewed:
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1008 times
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In lugnet.robotics, Michael Gasperi writes:
> In lugnet.robotics, lego-robotics@crynwr.com (Pete Sevcik) writes:
> > I have developed a converter brick to ease the job of attaching powered
> > sensors to the RCX. The brick converts the RCX sensor interface to a • [snip]
> I wonder if you have looked at the simple method for connecting sensors to a
> RCX on my web page? It really only takes 6 diodes and a capacitor to create a
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
caused by currents that are often less than 2ma and perhaps not past the
"knee" region of the diodes. I think its a cool item that I never would
have thought of, I'm a digital person with limited analog experience
though. Pete, cool idea! However, why would your angle sensor be non-
linear if connected directly to the RCX? It need not go through any diode
path at all as its a direct connection. Just wondering.
DLC
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Message has 2 Replies:
 | | Re: 3-wire converter for homebrew sensors
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| (...) 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 (...) (25 years ago, 25-Mar-99, to lugnet.robotics)
| | | Re: 3-wire converter for homebrew sensors
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| Dennis, Thanks for your encouragement. The angle sensor connected straight to the RCX is non-linear because it is in series with another resistor located inside the RCX. During a sense operation, the RCX drives the sensor input from a 10K resistor (...) (25 years ago, 26-Mar-99, to lugnet.robotics)
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Message is in Reply To:
| | Re: 3-wire converter for homebrew sensors
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| (...) I wonder if you have looked at the simple method for connecting sensors to a RCX on my web page? It really only takes 6 diodes and a capacitor to create a powered sensor interface. Add a opamp if you need gain. This work was originally (...) (25 years ago, 25-Mar-99, to lugnet.robotics)
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