Re: embedded aviation computers.

[Jerome Kaidor <jerryk@best.com>]

*** I have a thought for a small embedded project:

  As it happens, I'm installing a GNS430 in my airplane.  Perusal of the
'430 manual reveals that there is an input for OAT.  The '430 is already
connected to the transponder bus, so it knows the pressure altitude.  With
OAT input, it would also know density altitude.  In fact, one can read
the density altitude off on a screen.

   There does not seem to be a dedicated pin for OAT input.  Rather, this
information comes in as part of an ARINC serial data stream.  

  Sure would be cool if there was a pod with an OAT sensor and an ARINC
output.  Unfortunately, we're talking airliner stuff here - the pod that
does it is called an "air data computer", weighs a ton, and costs a king's
ransom.  Now, we're talking about a job that could be accomplished handily
by an 8751 hooked to an A/D.  Heck, the A/D could consist of a ladder
network of resistors and a comparitor.  I bet even a PIC could do it.

                           - Jerry Kaidor ( jerry@tr2.com )


    
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