119 lines
3.8 KiB
HTML
119 lines
3.8 KiB
HTML
== EasyMini
|
|
|
|
.EasyMini Board
|
|
image::easymini-top.jpg[width=400]
|
|
|
|
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 switched positive battery terminal to the pyro
|
|
charges must be done separate from EasyMini, by soldering
|
|
them together or using some other connector. Note that for
|
|
safety, you must put a switch between the pyro battery and
|
|
the rest of the circuit!
|
|
|
|
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.
|