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== TeleMini v2.0
.TeleMini v2.0 Board
image::telemini-v2-top.jpg[width="5.5in"]
TeleMini v2.0 is 0.8 inches by 1½ inches. It adds more
on-board data logging memory, a built-in USB connector and
screw terminals for the battery and power switch. The larger
board fits in a 24mm coupler. There's also a battery connector
for a LiPo battery if you want to use one of those.
=== TeleMini v2.0 Screw Terminals
TeleMini v2.0 has two sets of four screw terminals on the end of the
board opposite the telemetry antenna. Using the picture
above, the top four have connections for the main pyro
circuit and an external battery and the bottom four have
connections for the apogee pyro circuit and the power
switch. Counting from the left, the connections are as follows:
.TeleMini v2.0 Screw Terminals
[options="header",grid="all",cols="2,3,10"]
|====
|Terminal #|Terminal Name|Description
|Top 1
|Main -
|Main pyro channel connection to pyro circuit
|Top 2
|Main +
|Main pyro channel common connection to battery +
|Top 3
|Battery +
|Positive external battery terminal
|Top 4
|Battery -
|Negative external battery terminal
|Bottom 1
|Apogee -
|Apogee pyro channel connection to pyro circuit
|Bottom 2
|Apogee +
|Apogee pyro channel common connection to battery +
|Bottom 3
|Switch Output
|Switch connection to flight computer
|Bottom 4
|Switch Input
|Switch connection to positive battery terminal
|====
=== Connecting A Battery To TeleMini v2.0
There are two possible battery connections on TeleMini
v2.0. You can use either method; both feed through
the power switch terminals.
One battery connection is the standard Altus Metrum
white JST plug. This mates with single-cell Lithium
Polymer batteries sold by Altus Metrum.
The other is a pair of screw terminals marked 'Battery
+' and 'Battery -'. Connect a battery from 4 to 12
volts to these terminals, being careful to match polarity.
=== Charging Lithium Batteries
Because TeleMini v2.0 allows for batteries other than
the standard Altus Metrum Lithium Polymer cells, it
cannot incorporate a battery charger
circuit. Therefore, when using a Litium Polymer cell,
you'll need an external charger. These are available
from Altus Metrum, or from Spark Fun.
=== Using a Separate Pyro Battery with TeleMini v2.0
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.
To connect the negative pyro battery terminal to TeleMini
ground, connect it to the negative external battery
connection, top terminal 4.
Connecting the positive battery terminal to the pyro
charges must be done separate from TeleMini v2.0, 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 (top
terminal 1 for the Main charge, bottom terminal 1 for the
Apogee charge).
=== Using an Active Switch with TeleMini v2.0
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. Use
the negative external battery connection, top terminal 4 for
ground.
The positive battery terminal is available on bottom
terminal 4, the positive flight computer input is on the
bottom terminal 3.
|
