 | | Re: multiplexed touch sensors [was: Re ideas for a RIS 2.0] —Kekoa Proudfoot
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| | | (...) Having revisited this entire sub-thread, it seems people started rambling on (constructively, I think) about switch times, debouncing, etc. Getting back to multiplexed touch sensors, I bet it's possible to get the Lego touch sensors to work (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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| | | | | RE: multiplexed touch sensors [was: Re ideas for a RIS 2.0] —Ralph Hempel
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| | | | | (...) The problem with the LEGO touch sensors is that their resistance varies with the force on the plunger. To get the debouncing algorithm to work, you need to know how long the switch might be in the indeterminate state. (...) Typical switch (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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| | | | | Re: multiplexed touch sensors [was: Re ideas for a RIS 2.0] —Robert Munafo
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| | | | (...) It sounds like you're saying that the intermediate resistance values happen only for some period of time (short by human standards) while the touch sensor "switches" from "on" to "off" or vice versa. Other people writing in this thread have (...) (25 years ago, 25-Aug-99, to lugnet.robotics)
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| | | | | | Re: multiplexed touch sensors [was: Re ideas for a RIS 2.0] —Kekoa Proudfoot
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| | | | (...) I don't doubt that there are reasonable creations that e.g. press a touch sensor button halfway for extended periods of time, but I can't think of any off the top of my head. Can anybody help me out here? My point was that in what I would (...) (25 years ago, 26-Aug-99, to lugnet.robotics)
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| | | | | | Re: multiplexed touch sensors [was: Re ideas for a RIS 2.0] —Kekoa Proudfoot
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| | | | | (...) Okay, I felt like I had some time, so I looked into this a bit. I skipped the first part and jumped right into measuring a waveform. I measured a faster waveforms for now, but might give it another go with a longer waveforms and higher (...) (25 years ago, 26-Aug-99, to lugnet.robotics)
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| | | | | | Re: multiplexed touch sensors [was: Re ideas for a RIS 2.0] —Brian Alano
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| | | | (...) (snip) (...) I managed to use this touch sensor "feature" as sort of a poor man's bend sensor to improve my wall-following robot. It's a torbot-type design with a left and right feeler-type bumpers in front. Using NQC (thanks, Dave) I set the (...) (25 years ago, 27-Aug-99, to lugnet.robotics)
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| | | | | | Re: multiplexed touch sensors [was: Re ideas for a RIS 2.0] —Brian Alano
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| | | | | Some corrections to my last post: (...) should be: turning LEFT when greater than 1000, the robot kept its left feeler against (...) should be: spent most of the time between 101 and 110. (Once TRACKING the wall, I never *saw* (...) should be: (...) (25 years ago, 27-Aug-99, to lugnet.robotics)
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| | | | | | Re: multiplexed touch sensors [was: Re ideas for a RIS 2.0] —Kekoa Proudfoot
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| | | | (...) I gather the lever arms of the feelers gave you enough control over the touch sensor to stay mostly in the 100 to 110 range? It would seem to be difficult to keep the touch sensor in that position for long periods of time, since the sensor is (...) (25 years ago, 28-Aug-99, to lugnet.robotics)
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