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From: RWolf99@aol.com
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Date: Wed, 21 Feb 2001 14:57:56 EST
Subject: Re:  LNC4 Altitude Switch
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In a message dated 2/20/01 10:20:27 PM, Hal Woodruff wrote:

<<Another possibility for one of you "EE" types out there that a simple
circuit could grab the altitude encoder output and look for altitude above
10000 feet.

Any ideas or interest?>>

Hal -

I think it would be relatively easy to buy a baroswitch set for 10,000 feet.  
These should be readily available but I don't know the cost.  Maybe the 
Thomas Register has some sources.  Tying into the encoder signal may sound 
elegant, but the complexity of integrating this all seems much higher than a 
stand-alone pressure switch.  Maybe you can have a double-pole double-throw 
switch for the boost pump.  Use one pole to control the pump and the other 
pole to interrupt power to the light.  Wire it appropriately and the light 
will be off if the pump switch is turned on.  Your circuit is trivial in this 
configuration -- I can whip up a sketch if you need it.

- Rob Wolf
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