+++ /dev/null
-== 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.
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