doc: Start doc transition to asciidoc

[fw/altos] / doc / telemetrum.inc

diff --git a/doc/telemetrum.inc b/doc/telemetrum.inc
new file mode 100644 (file)
index 0000000..9562d99
--- /dev/null
+++ b/doc/telemetrum.inc
@@ -0,0 +1,68 @@
+== TeleMetrum
+
+       image::telemetrum-v1.1-thside.jpg[width="5.5in"]
+
+       TeleMetrum is a 1 inch by 2¾ inch circuit board.  It was designed to
+       fit inside coupler for 29mm air-frame tubing, but using it in a tube that
+       small in diameter may require some creativity in mounting and wiring
+       to succeed!  The presence of an accelerometer means TeleMetrum should
+       be aligned along the flight axis of the airframe, and by default the ¼
+       wave UHF wire antenna should be on the nose-cone end of the board.  The
+       antenna wire is about 7 inches long, and wiring for a power switch and
+       the e-matches for apogee and main ejection charges depart from the
+       fin can end of the board, meaning an ideal “simple” avionics
+       bay for TeleMetrum should have at least 10 inches of interior length.
+
+       === TeleMetrum Screw Terminals
+
+               TeleMetrum has six screw terminals on the end of the board
+               opposite the telemetry antenna. Two are for the power
+               switch, and two each for the apogee and main igniter
+               circuits. Using the picture above and starting from the top,
+               the terminals are as follows:
+
+               [options="header",grid="all",cols="2,3,10"]
+               |=========================
+               |Terminal #|Terminal Name|Description
+               |1      |Switch Output  |Switch connection to flight computer
+               |2      |Switch Input   |Switch connection to positive battery terminal
+               |3      |Main +         |Main pyro channel common connection to battery +
+               |4      |Main -         |Main pyro channel connection to pyro circuit
+               |5      |Apogee +       |Apogee pyro channel common connection to battery +
+               |6      |Apogee -       |Apogee pyro channel connection to pyro circuit
+               |========================
+
+       === Using a Separate Pyro Battery with TeleMetrum
+
+               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.
+
+               To connect the negative battery terminal to the TeleMetrum
+               ground, insert a small piece of wire, 24 to 28 gauge
+               stranded, into the GND hole just above the screw terminal
+               strip and solder it in place.
+
+               Connecting the positive battery terminal to the pyro
+               charges must be done separate from TeleMetrum, 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 4 for the
+               Main charge, terminal 6 for the Apogee charge).
+
+       === Using an Active Switch with TeleMetrum
+
+               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.
+
+
+               The positive battery terminal is available on screw terminal
+               2, the positive flight computer input is on terminal 1. To
+               hook a lead to ground, solder a piece of wire, 24 to 28
+               gauge stranded, to the GND hole just above terminal 1.
+