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== TeleMini v1.0
image::telemini-v1-top.jpg[width="5.5in"]
TeleMini v1.0 is ½ inches by 1½ inches. It was
designed to fit inside an 18mm air-frame tube, but using it in
a tube that small in diameter may require some creativity in
mounting and wiring to succeed! Since there is no
accelerometer, TeleMini can be mounted in any convenient
orientation. The default ¼ wave UHF wire antenna attached to
the center of one end of the board is about 7 inches long. Two
wires for the power switch are connected to holes in the
middle of the board. Screw terminals for the e-matches for
apogee and main ejection charges depart from the other end of
the board, meaning an ideal “simple” avionics bay for TeleMini
should have at least 9 inches of interior length.
=== TeleMini v1.0 Screw Terminals
TeleMini v1.0 has four screw terminals on the end of the
board opposite the telemetry antenna. Two are for the apogee
and two are for main igniter circuits. There are also wires
soldered to the board for the power switch. Using the
picture above and starting from the top for the terminals
and from the left for the power switch wires, the
connections are as follows:
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|====
|Terminal #|Terminal Name|Description
|1
|Apogee -
|Apogee pyro channel connection to pyro circuit
|2
|Apogee +
|Apogee pyro channel common connection to battery +
|3
|Main -
|Main pyro channel connection to pyro circuit
|4
|Main +
|Main pyro channel common connection to battery +
|Left
|Switch Output
|Switch connection to flight computer
|Right
|Switch Input
|Switch connection to positive battery terminal
|====
=== Using a Separate Pyro Battery with TeleMini v1.0
As described above, using an external pyro battery involves
connecting the negative battery terminal to the flight
computer ground, connecting the positive battery terminal to
one of the igniter leads and connecting the other igniter
lead to the per-channel pyro circuit connection. Because
there is no solid ground connection to use on TeleMini, this
is not recommended.
The only available ground connection on TeleMini v1.0 are
the two mounting holes next to the telemetry
antenna. Somehow connect a small piece of wire to one of
those holes and hook it to the negative pyro battery terminal.
Connecting the positive battery terminal to the pyro
charges must be done separate from TeleMini v1.0, by soldering
them together or using some other connector.
The other lead from each pyro charge is then inserted into
the appropriate per-pyro channel screw terminal (terminal 3 for the
Main charge, terminal 1 for the Apogee charge).
=== Using an Active Switch with TeleMini v1.0
As explained above, an external active switch requires three
connections, one to the positive battery terminal, one to
the flight computer positive input and one to ground. Again,
because TeleMini doesn't have any good ground connection,
this is not recommended.
The positive battery terminal is available on the Right
power switch wire, the positive flight computer input is on
the left power switch wire. Hook a lead to either of the
mounting holes for a ground connection.
|
