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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.
projects / fw / altos / blobdiff