4 image::telemini-v3.0-top.jpg[width="5.5in"]
5 image::telemini-v3.0-bottom.jpg[width="5.5in"]
7 TeleMini v3 is 0.5 inches by 1.67 inches. It was
8 designed to fit inside an 18mm air-frame tube, but using it in
9 a tube that small in diameter may require some creativity in
10 mounting and wiring to succeed! Since there is no
11 accelerometer, TeleMini can be mounted in any convenient
12 orientation. The default ¼ wave UHF wire antenna attached to
13 the center of one end of the board is about 7 inches long. Screw
14 terminals for the power switch are located in the
15 middle of the board. Screw terminals for the e-matches for
16 apogee and main ejection charges depart from the other end of
17 the board, meaning an ideal “simple” avionics bay for TeleMini
18 should have at least 9 inches of interior length.
20 === TeleMini v3 Screw Terminals
22 TeleMini v3 has four screw terminals on the end of the
23 board opposite the telemetry antenna. Two are for the apogee
24 and two are for main igniter circuits. Another two
25 screw terminals are located in the middle of the board
26 for the power switch. Using the
27 picture above and starting from the top for the pyro terminals
28 and from the left for the power switch terminals, the
29 connections are as follows:
31 .TeleMini v3 Screw Terminals
32 [options="header",grid="all",cols="2,3,10"]
34 |Terminal #|Terminal Name|Description
38 |Apogee pyro channel connection to pyro circuit
42 |Apogee pyro channel common connection to battery +
46 |Main pyro channel connection to pyro circuit
50 |Main pyro channel common connection to battery +
54 |Switch connection to flight computer
58 |Switch connection to positive battery terminal
61 === Using a Separate Pyro Battery with TeleMini v3
63 As described above, using an external pyro battery involves
64 connecting the negative battery terminal to the flight
65 computer ground, connecting the positive battery terminal to
66 one of the igniter leads and connecting the other igniter
67 lead to the per-channel pyro circuit connection. Because
68 there is no solid ground connection to use on TeleMini, this
71 The only available ground connection on TeleMini v3 are
72 the two mounting holes next to the telemetry
73 antenna. Somehow connect a small piece of wire to one of
74 those holes and hook it to the negative pyro battery terminal.
76 Connecting the positive battery terminal to the pyro
77 charges must be done separate from TeleMini v3, by soldering
78 them together or using some other connector.
80 The other lead from each pyro charge is then inserted into
81 the appropriate per-pyro channel screw terminal (terminal 3 for the
82 Main charge, terminal 1 for the Apogee charge).
84 === Using an Active Switch with TeleMini v3
86 As explained above, an external active switch requires three
87 connections, one to the positive battery terminal, one to
88 the flight computer positive input and one to ground. Again,
89 because TeleMini doesn't have any good ground connection,
90 this is not recommended.
92 The positive battery terminal is available on the Right
93 power switch wire, the positive flight computer input is on
94 the left power switch wire. Hook a lead to either of the
95 mounting holes for a ground connection.
97 === Using Packet Link Mode with TeleMini
99 After TeleMini powers up, it will check to see if some
100 device is attempting to communicate with it using
101 Packet Link Mode. If so, it will switch to idle mode
102 and start communicating. To switch to flight mode,
103 reboot the device either over the radio link or by
104 powering it off and back on.
106 If no ground station is attempting to communicate
107 using Packet Link Mode, TeleMini will enter pad mode
108 and prepare for flight.
110 The sequence of operations to use Packet Link Mode
113 1. Configure the ground station data rate, frequency
114 and callsign to match the TeleMini settings.
116 2. Start Packet Link Mode in the ground station by
117 selecting the desired operation (Safe Flight Data,
118 Configure Altimeter, Fire Igniter or Monitor
119 Idle). Select the TeleBT or TeleDongle device. The
120 red LED should begin flashing rapidly.
122 3. Turn on TeleMini. You should see the red LED flash
123 very rapidly during the initial communication burst,
124 but it should then slow down when the link is idle.
126 Once TeleMini is in Idle mode, it will stay in that
127 mode until rebooted. That means you can stop one
128 Packet Link operation, wait a while and start another
129 Packet Link operation.
131 === Forcing TeleMini radio parameters to known defaults
133 If you don't know what the TeleMini frequency and
134 callsign settings are, you can temporarily force it
135 back to the original default values (frequency
136 434.550MHz, callsign N0CALL) by connecting a wire
137 between hole 3 and hole 7 on the debug connector. Hole
138 3 has the square pad around it, hole 7 is the one
139 nearest the MS5607 baro sensor, which is a rectangular
140 component with a metal cap that has two holes in it.
142 Once TeleMini has been powered up with this wire
143 connected, the wire may be removed. The radio
144 parameters will stay set to these default values until
145 changed by the user or when the device is rebooted.
149 TeleMini v1 is the earlier version of this product. It
150 has a lower-power radio, less storage, no beeper and
151 soldered-in wires instead of screw terminals for the
155 image::telemini-v1-top.jpg[width="5.5in"]