2 == Flight Data Recording
4 Each flight computer logs data at 100 samples per second
5 during ascent and 10 samples per second during
7 descent, except for TeleMini v1.0, which records ascent at 10 samples
8 per second and descent at 1 sample per second.
14 an on-board flash memory part, which can be partitioned into
15 several equal-sized blocks, one for each flight.
17 .Data Storage on Altus Metrum altimeters
18 [options="header",cols="1,1,1,1"]
20 |Device |Bytes per Sample |Total Storage |Minutes at Full Rate
22 |TeleMetrum v1.0 |8 |1MB |20
23 |TeleMetrum v1.1 v1.2 |8 |2MB |40
24 |TeleMetrum v2.0 |16 |8MB |80
27 |TeleMini v1.0 |2 |5kB |4
28 |TeleMini v3.0 |16 |512kB |5
31 |EasyMini |16 |1MB |10
34 |TeleMega |32 |8MB |40
37 |EasyMega |32 |8MB |40
41 The on-board flash is partitioned into separate flight logs,
42 each of a fixed maximum size. Increase the maximum size of
43 each log and you reduce the number of flights that can be
44 stored. Decrease the size and you can store more flights.
46 Configuration data is also stored in the flash memory on
47 ifdef::telemetrum[TeleMetrum v1.x,]
48 ifdef::telemini[TeleMini v3.0 and]
49 ifdef::easymini[EasyMini.]
51 of flash space. This configuration space is not available
52 for storing flight log data.
54 ifdef::telemetrum,telemega,easymega[]
55 TeleMetrum v2.0, TeleMega and EasyMega
56 store configuration data in a bit of eeprom available within
57 the processor chip, leaving that space available in flash for
59 endif::telemetrum,telemega,easymega[]
61 To compute the amount of space needed for a single flight, you
62 can multiply the expected ascent time (in seconds) by 100
63 times bytes-per-sample, multiply the expected descent time (in
64 seconds) by 10 times the bytes per sample and add the two
65 together. That will slightly under-estimate the storage (in
66 bytes) needed for the flight.
68 For instance, a TeleMetrum v2.0 flight spending
69 20 seconds in ascent and 150 seconds in descent will take
70 about (20 * 1600) + (150 * 160) = 56000 bytes of storage. You
71 could store dozens of these flights in the on-board flash.
74 The default size allows for several flights on each flight
76 computer, except for TeleMini v1.0, which
77 only holds data for a single flight.
82 You can adjust the size.
84 Altus Metrum flight computers will not overwrite existing
85 flight data, so be sure to download flight data and erase it
86 from the flight computer before it fills up. The flight
87 computer will still successfully control the flight even if it
88 cannot log data, so the only thing you will lose is the data.