90 lines
3.0 KiB
PHP
90 lines
3.0 KiB
PHP
[appendix]
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== Flight Data Recording
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Each flight computer logs data at 100 samples per second
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during ascent and 10 samples per second during
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ifdef::telemini[]
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descent, except for TeleMini v1.0, which records ascent at 10 samples
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per second and descent at 1 sample per second.
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endif::telemini[]
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ifndef::telemini[]
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descent.
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endif::telemini[]
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Data are logged to
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an on-board flash memory part, which can be partitioned into
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several equal-sized blocks, one for each flight.
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.Data Storage on Altus Metrum altimeters
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[options="header",cols="1,1,1,1"]
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|====
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|Device |Bytes per Sample |Total Storage |Minutes at Full Rate
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ifdef::telemetrum[]
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|TeleMetrum v1.0 |8 |1MB |20
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|TeleMetrum v1.1 v1.2 |8 |2MB |40
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|TeleMetrum v2.0 |16 |8MB |80
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|TeleMetrum v3.0 |16 |8MB |80
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endif::telemetrum[]
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ifdef::telemini[]
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|TeleMini v1.0 |2 |5kB |4
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|TeleMini v3.0 |16 |512kB |5
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endif::telemini[]
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ifdef::easymini[]
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|EasyMini |16 |1MB |10
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endif::easymini[]
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ifdef::telemega[]
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|TeleMega |32 |8MB |40
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endif::telemega[]
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ifdef::easymega[]
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|EasyMega |32 |8MB |40
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endif::easymega[]
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|====
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The on-board flash is partitioned into separate flight logs,
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each of a fixed maximum size. Increase the maximum size of
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each log and you reduce the number of flights that can be
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stored. Decrease the size and you can store more flights.
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Configuration data is also stored in the flash memory on
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ifdef::telemetrum[TeleMetrum v1.x,]
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ifdef::telemini[TeleMini v3.0 and]
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ifdef::easymini[EasyMini.]
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This consumes 64kB
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of flash space. This configuration space is not available
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for storing flight log data.
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ifdef::telemetrum,telemega,easymega[]
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TeleMetrum v2 or newer, TeleMega and EasyMega
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store configuration data in a bit of eeprom available within
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the processor chip, leaving that space available in flash for
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more flight data.
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endif::telemetrum,telemega,easymega[]
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To compute the amount of space needed for a single flight, you
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can multiply the expected ascent time (in seconds) by 100
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times bytes-per-sample, multiply the expected descent time (in
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seconds) by 10 times the bytes per sample and add the two
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together. That will slightly under-estimate the storage (in
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bytes) needed for the flight.
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ifdef::telemetrum[]
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For instance, a TeleMetrum v2 or newer flight spending
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20 seconds in ascent and 150 seconds in descent will take
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about (20 * 1600) + (150 * 160) = 56000 bytes of storage. You
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could store dozens of these flights in the on-board flash.
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endif::telemetrum[]
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The default size allows for several flights on each flight
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ifdef::telemini[]
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computer, except for TeleMini v1.0, which
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only holds data for a single flight.
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endif::telemini[]
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ifndef::telemini[]
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computer.
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endif::telemini[]
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You can adjust the size.
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Altus Metrum flight computers will not overwrite existing
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flight data, so be sure to download flight data and erase it
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from the flight computer before it fills up. The flight
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computer will still successfully control the flight even if it
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cannot log data, so the only thing you will lose is the data.
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