Initial Commit - Copy from Altus Metrum AltOS

doc/easymega.inc

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+== EasyMega
+
+	.EasyMega Board
+	image::easymega-v1.0-top.jpg[width=400]
+
+	EasyMega is a 1¼ inch by 2¼ inch circuit board. It was
+	designed to easily fit in a 38mm coupler. Like TeleMetrum,
+	EasyMega has an accelerometer and so it must be mounted so that
+	the board is aligned with the flight axis. It can be mounted
+	either antenna up or down.
+
+	=== EasyMega Screw Terminals
+
+		EasyMega has two sets of nine screw terminals on the end of
+		the board opposite the telemetry antenna. They are as follows:
+
+		.EasyMega Screw Terminals
+		[options="header",grid="all",cols="2,3,10"]
+		|====
+		|Terminal #|Terminal Name|Description
+
+		|Top 1
+		|Switch Input
+		|Switch connection to positive battery terminal
+
+		|Top 2
+		|Switch Output
+		|Switch connection to flight computer
+
+		|Top 3
+		|GND
+		|Ground connection for use with external active switch
+
+		|Top 4
+		|Main -
+		|Main pyro channel connection to pyro circuit
+
+		|Top 5
+		|Main +++
+		|Main pyro channel common connection to battery +++
+
+		|Top 6
+		|Apogee -
+		|Apogee pyro channel connection to pyro circuit
+
+		|Top 7
+		|Apogee +++
+		|Apogee pyro channel common connection to battery +++
+
+		|Top 8
+		|D -
+		|D pyro channel connection to pyro circuit
+
+		|Top 9
+		|D +++
+		|D pyro channel common connection to battery +++
+
+		|Bottom 1
+		|GND
+		|Ground connection for negative pyro battery terminal
+
+		|Bottom 2
+		|Pyro
+		|Positive pyro battery terminal
+
+		|Bottom 3
+		|Lipo
+		|Power switch output. Use to connect main battery to pyro battery input
+
+		|Bottom 4
+		|A -
+		|A pyro channel connection to pyro circuit
+
+		|Bottom 5
+		|A +++
+		|A pyro channel common connection to battery +++
+
+		|Bottom 6
+		|B -
+		|B pyro channel connection to pyro circuit
+
+		|Bottom 7
+		|B +++
+		|B pyro channel common connection to battery +++
+
+		|Bottom 8
+		|C -
+		|C pyro channel connection to pyro circuit
+
+		|Bottom 9
+		|C +++
+		|C pyro channel common connection to battery +++
+		|====
+
+	=== Using a Separate Pyro Battery with EasyMega
+
+		EasyMega 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 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 EasyMega
+
+		Because EasyMega has built-in support for a separate pyro
+		battery, if you want to fly with just one battery running
+		both the computer and firing the charges, you need to
+		connect the flight computer battery to the pyro
+		circuit. EasyMega has two screw terminals for this—hook a
+		wire from the Lipo terminal (Bottom 3) to the Pyro terminal
+		(Bottom 2).
+
+      	=== Using an Active Switch with EasyMega
+
+		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.
+
+		The positive battery terminal is available on Top terminal
+		1, the positive flight computer input is on Top terminal
+		2. Ground is on Top terminal 3.