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Reading the System LED
When the computer is first powered on, the System LED will flash to inform you that the computer has been
powered. Next the flight computer will boot, (approximately 10 – 15 seconds), during which time the System
LED will not flash. After the flight computer successfully boots, the System LED will flash every time data is
saved or every six seconds. Every time data is successfully saved, it will either flash once, twice, or three times
to indicate how many sensors the computer has detected and is saving data from.
•
One Flash
•
Two Flashes
•
Three Flashes
IMPORTANT:
If you forgot to insert your micro SD card before powering on your flight computer, the System
LED will flash continuously to warn you not to launch until the micro SD card is inserted. Once you insert the
micro SD card, wait a few seconds. The System LED will now start flashing every six seconds.
•
Flashes Continuously
IMPORTANT:
In some instances, the System LED will only flash once every 30 seconds. This is to inform you
that the GPS receiver does not have valid clock data. Make sure your computer is outside and has a clear view
of the sky without buildings or trees obstructing its view. Also, make sure that there are no electronics that
could be potentially causing interference within close proximity of the computer.
Notes
GPS Receiver Interference – If you mount your flight computer inside a custom designed payload enclosure,
make sure that no metal objects, space blanket material, cameras, etc. are placed between the GPS receiver
and its view of the sky. Because your flight computer is designed to meet military specifications, it can be
mounted either externally or internally. No heat packs are required.
Using Your Flight Computer with a Tracking Device - Although some customers have concerns about placing
their flight computer in close proximity to a SPOT satellite tracker, we have never observed any interference
caused by placing a satellite tracker adjacent to the Eagle Flight Computer. As always, verify that all aspects of
your payload work simultaneously before launching. Never use a tracking device that broadcasts a signal over
a cellular network, whether it is a cell phone or any such device that transmits over a cellular network. Doing
so is illegal.
Choice of Batteries –
IMPORTANT:
AA batteries to power your flight computer. These are robust batteries designed to still maintain their voltage
at extremely low temperatures. Three of them will power your flight computer for well over 15 hours. Never
use alkaline batteries as they will fail to power your flight computer at cold temperatures.
How the Data File Works – Your flight data gets saved to a .txt file on your micro SD card. Data is always saved
to the same file. If the file already contains data when the computer is powered on, the computer will continue
to save data where it last left off. It will never delete old data. You can also remove the micro SD card from the
flight computer at any time without having to be concerned about losing or corrupting your data.
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Saving GPS data only (no sensor module detected).
Saving GPS data and data from a single sensor module.
Saving GPS data and data from two sensor modules.
No micro SD card detected.
High Altitude Science recommends using only Energizer Ultimate Lithium
Eagle Flight Computer Manual V1.0 – Page 4
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