Subject:
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Re: sensor input mux calculations
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 31 Dec 1998 17:06:12 GMT
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Original-From:
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{mwalimub@aol.com}AntiSpam{}
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Viewed:
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1012 times
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I've thought about this, but I've come up empty. If you could get between the
input line and the 10K pull-up resistor, it would be easy. You could then
wire the CdS cells on either side, with a 10K resistor from one cell to
ground. Then when the light was on the cell on the Negative side, the reading
would be between 512 and 1023. When it is on the Positive side, it would be
between 0 and 512.
A/D line
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inside the RCX | input port
5v--------[10k]---(CdS)------+-----(CdS)-----[10k]------gnd
But of course doing this would tamper with the hardware on a level few would
dare to go (not me, not yet any way).
You could try hooking up a voltage comparator type circuit where if the light
is on the right, it's on and if it's on the left, it's off. I would recommend
Forrest Mims Mini-Notebooks at Radio Shack for ideas on that.
chris
--
Did you check the web site first?: http://www.crynwr.com/lego-robotics
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Message has 1 Reply:
 | | Re: sensor input mux calculations
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| It is not a 100% passive solution, but I added a very simple Differential Light Sensor to my web page. It really isn't that hard to build and all the parts come from RadioShack. You can find it in the "Homebrew Sensor" area of (URL) a good New Year. (...) (25 years ago, 1-Jan-99, to lugnet.robotics)
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