== TeleMetrum
- image::telemetrum-v1.1-thside.jpg[width="5.5in"]
+ .TeleMetrum v2 Board
+ image::telemetrum-v2.0-th.jpg[width=400]
+
+ .TeleMetrum v1 Board
+ image::telemetrum-v1.1-thside.jpg[width=400]
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
fin can end of the board, meaning an ideal “simple” avionics
bay for TeleMetrum should have at least 10 inches of interior length.
+ There are two generations of the TeleMetrum design. The
+ major changes in the v2 generation are:
+
+ * uBlox GPS chip certified for altitude records
+
+ * Higher power radio (40mW vs 10mW)
+
+ * APRS support
+
+ Otherwise, they're the same size, with mounting holes and
+ screw terminals in the same position.
+
=== TeleMetrum Screw Terminals
TeleMetrum has six screw terminals on the end of the board
circuits. Using the picture above and starting from the top,
the terminals are as follows:
+ .TeleMetrum Screw Terminals
[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
|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