--- /dev/null
+== 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:
+
+ [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 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.
projects / fw / altos / blobdiff