LEGO SYSTEM Trains : 8551


Trains / 8551	8550 \| 8552

Subject:	reed switch w/2^n series resister
Newsgroups:	lugnet.trains, lugnet.robotics
Date:	Tue, 5 Dec 2000 20:09:12 GMT
Viewed:	1444 times

Chris If I understand correctly you can add a series resister to each reed switch using the formula r=2^n*R. Where n is the number of each switch (1,2,3...) and R is some resistence value that is friendly to the RCX. This way you can add several sensors to one input and read it like a temperature (anaolog value) sensor. This way the RCX can control many reed sensors. FYI I believe that the newer LEGO touch senors are adderessed in this way. Any more info on this would be great, I'm at the very edge of my RCX/sensor knowlegde here. SteveB

Message is in Reply To:

		"No Contact" Homebrew Train Sensor for Mindstorms
As has already been reported by others, I built an automated railroad crossing for the NELUG train display at last weekend's Greenberg show. I wanted to take a moment to describe the "homebrew" sensor that I used to detect an approaching train so (...) (24 years ago, 5-Dec-00, to lugnet.trains, lugnet.robotics)

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