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== TeleMini
.TeleMini v3 Board
image::telemini-v3.0-top.jpg[width="5.5in"]
image::telemini-v3.0-bottom.jpg[width="5.5in"]
TeleMini v3 is 0.5 inches by 1.67 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. Screw
terminals for the power switch are located 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 v3 Screw Terminals
TeleMini v3 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. Another two
screw terminals are located in the middle of the board
for the power switch. Using the
picture above and starting from the top for the pyro terminals
and from the left for the power switch terminals, the
connections are as follows:
.TeleMini v3 Screw Terminals
[options="header",grid="all",cols="2,3,10"]
|====
|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 v3
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 v3 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 v3, 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 v3
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.
=== Using Packet Link Mode with TeleMini
After TeleMini powers up, it will check to see if some
device is attempting to communicate with it using
Packet Link Mode. If so, it will switch to idle mode
and start communicating. To switch to flight mode,
reboot the device either over the radio link or by
powering it off and back on.
If no ground station is attempting to communicate
using Packet Link Mode, TeleMini will enter pad mode
and prepare for flight.
The sequence of operations to use Packet Link Mode
with TeleMini is:
1. Configure the ground station data rate, frequency
and callsign to match the TeleMini settings.
2. Start Packet Link Mode in the ground station by
selecting the desired operation (Safe Flight Data,
Configure Altimeter, Fire Igniter or Monitor
Idle). Select the TeleBT or TeleDongle device. The
red LED should begin flashing rapidly.
3. Turn on TeleMini. You should see the red LED flash
very rapidly during the initial communication burst,
but it should then slow down when the link is idle.
Once TeleMini is in Idle mode, it will stay in that
mode until rebooted. That means you can stop one
Packet Link operation, wait a while and start another
Packet Link operation.
=== Forcing TeleMini radio parameters to known defaults
If you don't know what the TeleMini frequency and
callsign settings are, you can temporarily force it
back to the original default values (frequency
434.550MHz, callsign N0CALL) by connecting a wire
between hole 3 and hole 7 on the debug connector. Hole
3 has the square pad around it, hole 7 is the one
nearest the MS5607 baro sensor, which is a rectangular
component with a metal cap that has two holes in it.
Once TeleMini has been powered up with this wire
connected, the wire may be removed. The radio
parameters will stay set to these default values until
changed by the user or when the device is rebooted.
=== TeleMini v1
TeleMini v1 is the earlier version of this product. It
has a lower-power radio, less storage, no beeper and
soldered-in wires instead of screw terminals for the
power switch.
.TeleMini v1 Board
image::telemini-v1-top.jpg[width="5.5in"]
|
