Skydiving Altimeter

From Texas Instruments Embedded Processors Wiki

Contents 1 About 2 User manual 3 Contacts 4 Disclaimer 5 Files

About

This firmware based on origiginal Chronos firmware ver. 1.6

I have implemented some features special for skydiving:

1. Automatic zero level set.
2. Blank second line.
3. Different simple pressure to altitude function.
4. Altimeter timeout (12 hours) for battery saving.
5. Direct altitude render without filtering.

This is the second beta firmware, but it is completly working and tested during some skydive jumps. The difference from airplane altimeter was near 1% at 4 kilomiter altitude.

At the bottom of this page you can find compiled firmwares for 3 versions fo Chronos watch (433, 868 and 915 Mhz) and the sources for CCS.

User manual

1. Change the top line to altimeter by pressing * button (0m is diplayed).
2. Change the second line to blank by pressing # button.
3. Lock buttons by pressing # and 'down' buttons together for some time.
4. Jump from the plane!

Contacts

You can write any questions and feature requests to valera AT krilov.net

The discussion at skycentre.net (sorry, only russian lang)

Disclaimer

SKYDIVING IS A POTENTIALLY DANGEROUS ACTIVITY THAT CAN RESULT IN INJURY OR DEATH. EACH INDIVIDUAL PARTICIPANT, REGARDLESS OF EXPERIENCE, HAS FINAL RESPONSIBILITY FOR HIS OWN SAFETY

Real altitude can be different from Chronos watch. USE IT AT YOU OWN RISK.

Files

Current version Beta 0.02

Sources: File:Skydiving altimeter source ver 0.02.zip

Firmwares: File:Skydiving altimeter firmware ver 0.02.zip

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