 | | 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 (...) (26 years ago, 25-Mar-99, to lugnet.robotics)
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| | Re: 3-wire converter for homebrew sensors
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(...) [snip] (...) 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 (...) (26 years ago, 25-Mar-99, to lugnet.robotics)
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| | 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 (...) (26 years ago, 25-Mar-99, to lugnet.robotics)
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| | 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 (...) (26 years ago, 26-Mar-99, to lugnet.robotics)
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