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 Robotics / 17556
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Subject: 
Re: is it possible to use a polarity switch with a RCX input?
Newsgroups: 
lugnet.robotics, lugnet.robotics.rcx
Date: 
Tue, 26 Mar 2002 13:16:11 GMT
Viewed: 
1387 times
  
"Jerry Kalpin" <jdkalpin@sympatico.ca> writes:
In lugnet.robotics, Steven Nickle writes:
In lugnet.robotics, Jonathan Wilson writes:
Basicly, what I want is a button, switch or whatever on my model that
when moved one way causes one input to be sent to the RCX but when moved
differently it causes a different input to be sent to the RCX. Should
also have a 3rd "off" state.
I am going to use it on my RCX controlled tank. RCX will use 2 touch
sensors plus 1 motor to drive treads forward or back, touch sensors will
trigger if it bumps into something.
The "switch" I need will controll second motor attached to a large
turntable to rotate turret.

Use a resistor to make one of the states of the switch read less than a • full
short.  Setup as a light sensor.  0 means off  50~ means one state and • 100
means another.

This is the basis for alot of the touch sensor multipliers.  I am sure if
you dig around you can find the right values.  I don't have any my books • handy.

But... be aware that the 'polarity switch' has only two connectors (for • two
sets of wires).  It's not a '3-way' where you can try to select one of two
inputs by moving the lever.  The action is forward-off-reverse with one
power source connected to one motor.

I'm not very familiar with electronics, but I am wondering whether the
combination of two diodes with a resistor could solve the problem. I mean
this: when current flows in a certain direction, it crosses a diode,
resulting in a very low resistence. When the polarity is reversed, current
passes through the other diode (wired with opposed polarity), which is in
series with a resistor. If this works, the polarity switch can be used as a
three states input device for the RCX, which would be a nice application.

Talking about polarity switches, which IMO are very useful devices, I know
that they are unavailable at S@H if the destination is in the US, but I want
to point out that they are available for all the European countries. If you
need some of them, find a friend from UK or Germany willing to order and
re-ship them in the US.
I would offer to do that myself, but Italy's not yet been included in the
list of countries served by Lego Direct :-(

Ciao
Mario



Message is in Reply To:
  Re: is it possible to use a polarity switch with a RCX input?
 
(...) But... be aware that the 'polarity switch' has only two connectors (for two sets of wires). It's not a '3-way' where you can try to select one of two inputs by moving the lever. The action is forward-off-reverse with one power source connected (...) (23 years ago, 25-Mar-02, to lugnet.robotics, lugnet.robotics.rcx)

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