== TeleMetrum
.TeleMetrum v2 Board
- image::telemetrum-v2.0-th.jpg[width="5.5in"]
+ image::telemetrum-v2.0-th.jpg[width=400]
.TeleMetrum v1 Board
- image::telemetrum-v1.1-thside.jpg[width="5.5in"]
+ 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
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:
+ major changes after v1 generation are:
* uBlox GPS chip certified for altitude records
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
- |3 |Main + |Main pyro channel common connection to battery +
+ |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 +
+ |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
stranded, into the GND hole just above the screw terminal
strip and solder it in place.
- Connecting the positive battery terminal to the pyro
+ Connecting the switched positive battery terminal to the pyro
charges must be done separate from TeleMetrum, by soldering
- them together or using some other connector.
-
+ them together or using some other connector. Note that you
+ must include a switch in the positive lead from the pyro
+ battery for safety!
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).
+ 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