doc: Split out EasyMini into a separate manual

EasyMini uses a tiny fraction of the overall system software;
splitting the manual out makes it a lot smaller.

Signed-off-by: Keith Packard <keithp@keithp.com>

1 files changed, 116 insertions, 0 deletions

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+== EasyMini
+
+	.EasyMini Board
+	image::easymini-top.jpg[width="5.5in"]
+
+	EasyMini is built on a 0.8 inch by 1½ inch circuit board. It's
+	designed to fit in a 24mm coupler tube.
+
+	You usually don't need to configure EasyMini at all; it's set
+	up to do dual-deployment with an event at apogee to separate
+	the airframe and deploy a drogue and another event at 250m
+	(820ft) to deploy the main. Install EasyMini in your airframe,
+	hook up a battery, igniters and a power switch and you're
+	ready to fly.
+
+	=== EasyMini Screw Terminals
+	
+		EasyMini has two sets of four screw terminals near one end of the
+		board. Using the picture
+		above, the top four have connections for the main pyro
+		circuit and an external battery and the bottom four have
+		connections for the apogee pyro circuit and the power
+		switch. Counting from the left, the connections are as follows:
+
+		.EasyMini Screw Terminals
+		[options="header",grid="all",cols="2,3,10"]
+		|====
+		|Terminal #|Terminal Name|Description
+		|Top 1
+		|Main -
+		|Main pyro channel connection to pyro circuit
+	      
+		|Top 2
+		|Main +
+		|Main pyro channel common connection to battery +
+	      
+		|Top 3
+		|Battery +
+		|Positive external battery terminal
+	      
+		|Top 4
+		|Battery -
+		|Negative external battery terminal
+	      
+		|Bottom 1
+		|Apogee -
+		|Apogee pyro channel connection to pyro circuit
+	      
+		|Bottom 2
+		|Apogee +
+		|Apogee pyro channel common connection to battery +
+	      
+		|Bottom 3
+		|Switch Output
+		|Switch connection to flight computer
+	      
+		|Bottom 4
+		|Switch Input
+		|Switch connection to positive battery terminal
+		|====
+
+	=== Connecting A Battery To EasyMini
+
+		There are two possible battery connections on
+		EasyMini. You can use either method; both feed
+		through the power switch terminals.
+
+		One battery connection is the standard Altus Metrum
+		white JST plug. This mates with single-cell Lithium
+		Polymer batteries sold by Altus Metrum.
+
+		The other is a pair of screw terminals marked 'Battery
+		+' and 'Battery -'. Connect a battery from 4 to 12
+		volts to these terminals, being careful to match polarity.
+
+	=== Charging Lithium Batteries
+
+		Because EasyMini allows for batteries other than the
+		standard Altus Metrum Lithium Polymer cells, it cannot
+		incorporate a battery charger circuit. Therefore, when
+		using a Litium Polymer cell, you'll need an external
+		charger. These are available from Altus Metrum, or
+		from Spark Fun.
+
+      	=== Using a Separate Pyro Battery with EasyMini
+	
+		As described above, using an external pyro battery involves
+		connecting the negative battery terminal to the flight
+		computer ground, connecting the positive battery terminal to
+		one of the igniter leads and connecting the other igniter
+		lead to the per-channel pyro circuit connection.
+
+		To connect the negative pyro battery terminal to EasyMini
+		ground, connect it to the negative external battery
+		connection, top terminal 4.
+
+		Connecting the positive battery terminal to the pyro
+		charges must be done separate from EasyMini, by soldering
+		them together or using some other connector.
+
+		The other lead from each pyro charge is then inserted into
+		the appropriate per-pyro channel screw terminal (top
+		terminal 1 for the Main charge, bottom terminal 1 for the
+		Apogee charge).
+
+      	=== Using an Active Switch with EasyMini
+	
+		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. Use
+		the negative external battery connection, top terminal 4 for
+		ground.
+
+		The positive battery terminal is available on bottom
+		terminal 4, the positive flight computer input is on the
+		bottom terminal 3.