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== Installation
A typical installation involves attaching
only a suitable battery, a single pole switch for
power on/off, and two pairs of wires connecting e-matches for the
apogee and main ejection charges. All Altus Metrum products are
designed for use with single-cell batteries with 3.7 volts
nominal.
ifdef::telemini[TeleMini v2.0 and]
EasyMini may also be used with other
batteries as long as they supply between 4 and 12 volts.
The battery connectors are a standard 2-pin JST connector; you
can purchase suitable batteries from the any vendor selling
Altus Metrum products. These batteries are
single-cell Lithium Polymer batteries that nominally provide 3.7
volts. Other vendors sell similar batteries for RC aircraft
using mating connectors, however the polarity for those is
generally reversed from the batteries used by Altus Metrum
products. In particular, the Tenergy batteries supplied for use
in Featherweight flight computers are not compatible with Altus
Metrum flight computers or battery chargers.
[WARNING]
Check polarity and voltage before connecting any battery not
purchased from Altus Metrum.
[WARNING]
Spark Fun sells batteries that have a matching connector with
the correct polarity. However, these batteries include an
integrated current limiting circuit. That circuit will cause
the battery to shut down when firing the igniter circuit. Do
not use these batteries unless you remove the current limiting
circuit.
By default, we use the unregulated output of the battery
directly to fire ejection charges. This works marvelously
with standard low-current e-matches like the J-Tek from MJG
Technologies, and with Quest Q2G2 igniters. However, if you
want or need to use a separate pyro battery, check out
<<_using_a_separate_pyro_battery>> for instructions on how to wire
that up. The altimeters are designed to work with an external
pyro battery of no more than 15 volts.
Ejection charges are wired directly to the screw terminal block
at the aft end of the altimeter. You'll need a very small straight
blade screwdriver for these screws, such as you might find in a
jeweler's screwdriver set.
ifndef::telemini[]
The screw terminal block is also used for the power switch leads.
endif::telemini[]
ifdef::telemini[]
Except for TeleMini v1.0, the flight computers also use the
screw terminal block for the power switch leads. On TeleMini v1.0,
the power switch leads are soldered directly to the board and
can be connected directly to a switch.
endif::telemini[]
ifdef::radio[]
For most air-frames, the integrated antennas are more than
adequate. However, if you are installing in a carbon-fiber or
metal electronics bay which is opaque to RF signals, you may need to
use off-board external antennas instead. In this case, you can
replace the stock UHF antenna wire with an edge-launched SMA connector,
and, on TeleMetrum v1, you can unplug the integrated GPS
antenna and select an appropriate off-board GPS antenna with
cable terminating in a U.FL connector.
endif::radio[]
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