4 image::easymini-top.jpg[width=400]
6 EasyMini is built on a 0.8 inch by 1½ inch circuit board. It's
7 designed to fit in a 24mm coupler tube.
9 You usually don't need to configure EasyMini at all; it's set
10 up to do dual-deployment with an event at apogee to separate
11 the airframe and deploy a drogue and another event at 250m
12 (820ft) to deploy the main. Install EasyMini in your airframe,
13 hook up a battery, igniters and a power switch and you're
16 === EasyMini Screw Terminals
18 EasyMini has two sets of four screw terminals near one end of the
19 board. Using the picture
20 above, the top four have connections for the main pyro
21 circuit and an external battery and the bottom four have
22 connections for the apogee pyro circuit and the power
23 switch. Counting from the left, the connections are as follows:
25 .EasyMini Screw Terminals
26 [options="header",grid="all",cols="2,3,10"]
28 |Terminal #|Terminal Name|Description
31 |Main pyro channel connection to pyro circuit
35 |Main pyro channel common connection to battery +
39 |Positive external battery terminal
43 |Negative external battery terminal
47 |Apogee pyro channel connection to pyro circuit
51 |Apogee pyro channel common connection to battery +
55 |Switch connection to flight computer
59 |Switch connection to positive battery terminal
62 === Connecting A Battery To EasyMini
64 There are two possible battery connections on
65 EasyMini. You can use either method; both feed
66 through the power switch terminals.
68 One battery connection is the standard Altus Metrum
69 white JST plug. This mates with single-cell Lithium
70 Polymer batteries sold by Altus Metrum.
72 The other is a pair of screw terminals marked 'Battery
73 +' and 'Battery -'. Connect a battery from 4 to 12
74 volts to these terminals, being careful to match polarity.
76 === Charging Lithium Batteries
78 Because EasyMini allows for batteries other than the
79 standard Altus Metrum Lithium Polymer cells, it cannot
80 incorporate a battery charger circuit. Therefore, when
81 using a Litium Polymer cell, you'll need an external
82 charger. These are available from Altus Metrum, or
85 === Using a Separate Pyro Battery with EasyMini
87 As described above, using an external pyro battery involves
88 connecting the negative battery terminal to the flight
89 computer ground, connecting the positive battery terminal to
90 one of the igniter leads and connecting the other igniter
91 lead to the per-channel pyro circuit connection.
93 To connect the negative pyro battery terminal to EasyMini
94 ground, connect it to the negative external battery
95 connection, top terminal 4.
97 Connecting the positive battery terminal to the pyro
98 charges must be done separate from EasyMini, by soldering
99 them together or using some other connector.
101 The other lead from each pyro charge is then inserted into
102 the appropriate per-pyro channel screw terminal (top
103 terminal 1 for the Main charge, bottom terminal 1 for the
106 === Using an Active Switch with EasyMini
108 As explained above, an external active switch requires three
109 connections, one to the positive battery terminal, one to
110 the flight computer positive input and one to ground. Use
111 the negative external battery connection, top terminal 4 for
114 The positive battery terminal is available on bottom
115 terminal 4, the positive flight computer input is on the