At 10:22 AM 8/10/2003 -0500, you wrote:
>Hi Tom,
>
>That means a Baby Grill Device !!!, I am thinking in safety first. Maybe two
>controllers working in parallel with a third one checking each others will
>do the work well.  I am planning to use PC100 thermocouples ( there are very
>sensitive and fast ), heath source must have an external cut off
>sensor/switch to avoid overheath.
>The thing is to send via RS232 any change in temperature, humidity, air flow
>and maybe the beat rate of the baby4s heart to a remote workstation.
>
>Augusto

Think about things like the nurse puts a towell over the temperature sensor
- the controller sees low temps and turns on the heat.  And 10,000 more
problems like that one.  Consider *every* component going to short or open
or oscillating or ???  Consider learning that some PIC's don't work
reliably above 4MHz (last week here on the piclist).

One obvious idea is to have a heat source that when on 100% cannot produce
enough heat to harm the infant.  It takes longer to come up to temperature
however.  The company I worked for also built an infant respirator and used
2 uC's for failsafe to prevent exploding the babies lungs.  I think it took
5 years to be certified by the US FDA agency. This was all back in the
1970's.

And of course, try out your designs on *your own baby* first.  I am glad
not to be working in that field any more.

Good luck!
Tom

At Walmart now! The George Foreman "Fry Baby"!  er.. nevermind

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