4 image::telemega-v1.0-top.jpg[width="5.5in"]
6 TeleMega is a 1¼ inch by 3¼ inch circuit board. It was
7 designed to easily fit in a 38mm coupler. Like TeleMetrum,
8 TeleMega has an accelerometer and so it must be mounted so that
9 the board is aligned with the flight axis. It can be mounted
10 either antenna up or down.
12 TeleMega v2.0 has a few minor changes from v1.0:
14 * Companion connector matches EasyMega functions
15 * Serial port connector replaced with servo connector with
16 support for up to 4 PWM channels.
17 * Radio switched from cc1120 to cc1200.
19 None of these affect operation using the stock firmware, but
20 they do mean that the device needs different firmware to
21 operate correctly, so make sure you load the right firmware
22 when reflashing the device.
24 === TeleMega Screw Terminals
26 TeleMega has two sets of nine screw terminals on the end of
27 the board opposite the telemetry antenna. They are as follows:
29 .TeleMega Screw Terminals
30 [options="header",grid="all",cols="2,3,10"]
32 |Terminal #|Terminal Name|Description
36 |Switch connection to positive battery terminal
40 |Switch connection to flight computer
44 |Ground connection for use with external active switch
48 |Main pyro channel connection to pyro circuit
52 |Main pyro channel common connection to battery +
56 |Apogee pyro channel connection to pyro circuit
60 |Apogee pyro channel common connection to battery +
64 |D pyro channel connection to pyro circuit
68 |D pyro channel common connection to battery +
72 |Ground connection for negative pyro battery terminal
76 |Positive pyro battery terminal
80 |Power switch output. Use to connect main battery to pyro battery input
84 |A pyro channel connection to pyro circuit
88 |A pyro channel common connection to battery +
92 |B pyro channel connection to pyro circuit
96 |B pyro channel common connection to battery +
100 |C pyro channel connection to pyro circuit
104 |C pyro channel common connection to battery +
107 === Using a Separate Pyro Battery with TeleMega
109 TeleMega provides explicit support for an external pyro
110 battery. All that is required is to remove the jumper
111 between the lipo terminal (Bottom 3) and the pyro terminal
112 (Bottom 2). Then hook the negative pyro battery terminal to ground
113 (Bottom 1) and the positive pyro battery to the pyro battery
114 input (Bottom 2). You can then use the existing pyro screw
115 terminals to hook up all of the pyro charges.
117 === Using Only One Battery With TeleMega
119 Because TeleMega has built-in support for a separate pyro
120 battery, if you want to fly with just one battery running
121 both the computer and firing the charges, you need to
122 connect the flight computer battery to the pyro
123 circuit. TeleMega has two screw terminals for this—hook a
124 wire from the Lipo terminal (Bottom 3) to the Pyro terminal
127 === Using an Active Switch with TeleMega
129 As explained above, an external active switch requires three
130 connections, one to the positive battery terminal, one to
131 the flight computer positive input and one to ground.
133 The positive battery terminal is available on Top terminal
134 1, the positive flight computer input is on Top terminal
135 2. Ground is on Top terminal 3.