Hey everyone,

I posted a few months back about building an altimeter based on pressure and
accelerometer data acquired by a PIC microcontroller and stored on an EEPROM
chip. Some good points were brought to my attention, including the use of a
resistor/capacitor oscillator as opposed to a crystal. Looking at my design
now, I'm thinking I'd like to use a crystal because of its accuracy. Back
when I first posted someone said the crystal may not hold to its frequency in
flight because of the G's it will be subjected to. However, taking a look at
commercial altimeters (like the R-DAS. pictures at
http://www.fortunepaint.com/aerocon_interim/rdas.htm ) I notice that they
often use crystal oscillators. Does this mean it's generally okay to use them
without much frequency drift?

Thanks,
-Tony

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