update info on using separate pyro batteries to encourage including a switch

[fw/altos] / doc / telemega.inc

diff --git a/doc/telemega.inc b/doc/telemega.inc
index 12db50d62bd91ac4913cad6671cc30578e39bfb7..092077e00da73e04923c77167f9e783d965e8283 100644 (file)
--- a/doc/telemega.inc
+++ b/doc/telemega.inc
@@ -1,6 +1,7 @@
 == TeleMega
 
-       image::telemega-v1.0-top.jpg[width="5.5in"]
+       .TeleMega Board
+       image::telemega-v1.0-top.jpg[width=400]
 
        TeleMega is a 1¼ inch by 3¼ inch circuit board. It was
        designed to easily fit in a 38mm coupler. Like TeleMetrum,
@@ -8,11 +9,24 @@
        the board is aligned with the flight axis. It can be mounted
        either antenna up or down.
 
+       TeleMega v2.0 has a few minor changes from v1.0:
+
+       * Companion connector matches EasyMega functions
+       * Serial port connector replaced with servo connector with
+         support for up to 4 PWM channels.
+       * Radio switched from cc1120 to cc1200.
+
+       None of these affect operation using the stock firmware, but
+       they do mean that the device needs different firmware to
+       operate correctly, so make sure you load the right firmware
+       when reflashing the device.
+
        === TeleMega Screw Terminals
 
                TeleMega has two sets of nine screw terminals on the end of
                the board opposite the telemetry antenna. They are as follows:
 
+               .TeleMega Screw Terminals
                [options="header",grid="all",cols="2,3,10"]
                |====
                |Terminal #|Terminal Name|Description
@@ -95,9 +109,12 @@
                TeleMega provides explicit support for an external pyro
                battery. All that is required is to remove the jumper
                between the lipo terminal (Bottom 3) and the pyro terminal
-               (Bottom 2). Then hook the negative pyro battery terminal to ground
-               (Bottom 1) and the positive pyro battery to the pyro battery
-               input (Bottom 2). You can then use the existing pyro screw
+               (Bottom 2). Then hook the negative pyro battery terminal to 
+               ground (Bottom 1) and the switched positive pyro battery to 
+               the pyro battery input (Bottom 2). Note that you must include
+                a switch between the pyro battery and the board for safety,
+                as the on-board power switch circuit only supports the primary
+                battery!  You can then use the existing pyro screw
                terminals to hook up all of the pyro charges.
 
        === Using Only One Battery With TeleMega