4 image::telemini-v2-top.jpg[width="5.5in"]
6 TeleMini v2.0 is 0.8 inches by 1½ inches. It adds more
7 on-board data logging memory, a built-in USB connector and
8 screw terminals for the battery and power switch. The larger
9 board fits in a 24mm coupler. There's also a battery connector
10 for a LiPo battery if you want to use one of those.
12 === TeleMini v2.0 Screw Terminals
14 TeleMini v2.0 has two sets of four screw terminals on the end of the
15 board opposite the telemetry antenna. Using the picture
16 above, the top four have connections for the main pyro
17 circuit and an external battery and the bottom four have
18 connections for the apogee pyro circuit and the power
19 switch. Counting from the left, the connections are as follows:
21 .TeleMini v2.0 Screw Terminals
22 [options="header",grid="all",cols="2,3,10"]
24 |Terminal #|Terminal Name|Description
27 |Main pyro channel connection to pyro circuit
31 |Main pyro channel common connection to battery +
35 |Positive external battery terminal
39 |Negative external battery terminal
43 |Apogee pyro channel connection to pyro circuit
47 |Apogee pyro channel common connection to battery +
51 |Switch connection to flight computer
55 |Switch connection to positive battery terminal
58 === Connecting A Battery To TeleMini v2.0
60 There are two possible battery connections on TeleMini
61 v2.0. You can use either method; both feed through
62 the power switch terminals.
64 One battery connection is the standard Altus Metrum
65 white JST plug. This mates with single-cell Lithium
66 Polymer batteries sold by Altus Metrum.
68 The other is a pair of screw terminals marked 'Battery
69 +' and 'Battery -'. Connect a battery from 4 to 12
70 volts to these terminals, being careful to match polarity.
72 === Charging Lithium Batteries
74 Because TeleMini v2.0 allows for batteries other than
75 the standard Altus Metrum Lithium Polymer cells, it
76 cannot incorporate a battery charger
77 circuit. Therefore, when using a Litium Polymer cell,
78 you'll need an external charger. These are available
79 from Altus Metrum, or from Spark Fun.
81 === Using a Separate Pyro Battery with TeleMini v2.0
83 As described above, using an external pyro battery involves
84 connecting the negative battery terminal to the flight
85 computer ground, connecting the positive battery terminal to
86 one of the igniter leads and connecting the other igniter
87 lead to the per-channel pyro circuit connection.
89 To connect the negative pyro battery terminal to TeleMini
90 ground, connect it to the negative external battery
91 connection, top terminal 4.
93 Connecting the positive battery terminal to the pyro
94 charges must be done separate from TeleMini v2.0, by soldering
95 them together or using some other connector.
97 The other lead from each pyro charge is then inserted into
98 the appropriate per-pyro channel screw terminal (top
99 terminal 1 for the Main charge, bottom terminal 1 for the
102 === Using an Active Switch with TeleMini v2.0
104 As explained above, an external active switch requires three
105 connections, one to the positive battery terminal, one to
106 the flight computer positive input and one to ground. Use
107 the negative external battery connection, top terminal 4 for
110 The positive battery terminal is available on bottom
111 terminal 4, the positive flight computer input is on the