strip, crimp connectors, or by soldering wires together is of course entirely
up to you!
-## TeleMetrum ##
+## TeleMetrum, TeleMini, and EasyMini ##
-Early [TeleMetrum](http://altusmetrum.org/TeleMetrum) boards had an
+Very early [TeleMetrum](http://altusmetrum.org/TeleMetrum) boards had an
unpopulated connector footprint on the board
for a separate pyro battery, but due to a wiring error in the design of the
board, that connector was never useful. Just ignore it.
-If you look at the bottom of the board where all the surface-mounted components
-are, on the end where the pyro screw terminals are located, you can see a
+Each of these products can be used with a separate pyro battery, but unlike
+TeleMega and EasyMega, there are no extra screw terminals to make it easy.
+
+On TeleMetrum, if you look at the bottom of the board where all the
+surface-mounted components are, on the end where the pyro screw terminals
+are located, you can see a
fat trace connecting three of the screw terminals together. This is the
source of pyro power, which comes from the LiPo battery through the power
switch and then to one side of each pyro channel. The pins that trace
<img src="TeleMetrumSepPyro.jpg"/>
-## TeleMini ##
-
-Wiring a [TeleMini](http://altusmetrum.org/TeleMini) board for use with a
-separate pyro battery works the same way.
-
-If you look at the bottom of the board where all the surface-mounted components
-are, on the end where the pyro screw terminals are located, you can see a fat
-trace connecting two of the screws. This is the
-source of pyro power, which comes from the LiPo battery through the power
-switch and then to one side of each pyro channel. The pins that trace
-connects are therefore the ones you want to ignore. The others are the
-switches to ground.
+[TeleMini](http://altusmetrum.org/TeleMini)
+and
+[EasyMini](http://altusmetrum.org/EasyMini)
+work the same way electrically, but the screw terminal physical
+arrangements are different. The two pyro channels have a pin each that
+are connected together and to the pyro voltage. Ignore those, the other
+two screws are the switches to ground.
Here's a photo of the pyro end of a TeleMini board augmented to show what
to connect where:
<img src="TeleMiniSepPyro.jpg"/>
-## TeleMega ##
+And here's a photo of an EasyMini board augmented to show what
+to connect where:
+
+<img src="EasyMiniSepPyro.jpg"/>
-Because [TeleMega](http://altusmetrum.org/TeleMega) was designed to
+## TeleMega and EasyMega ##
+
+Because [TeleMega](http://altusmetrum.org/TeleMega) and
+[EasyMega](http://altusmetrum.org/EasyMega) were designed to
be especially well suited for use in large
-and complex projects, it includes extra screw terminals on board to make use
-of a separate pyro battery easy. In fact, use of a TeleMega with only one
+and complex projects, they include extra screw terminals on board to make use
+of a separate pyro battery easy. In fact, use of a TeleMega or EasyMega
+with only one
battery requires putting a jumper between two adjacent screw terminals to
-connect the main LiPo battery to the pyro power rail.
+connect the main LiPo battery to the pyro power rail. All such boards
+ship with this jumper installed from the factory.
-To use a separate pyro battery, just leave out the jumper and connect the
+To use a separate pyro battery, just remove the jumper and connect the
pyro battery to the two adjacent screw terminals marked 'gnd' and 'pyro',
using the 'gnd' terminal for the negative battery lead and the 'pyro'
terminal for the positive side. Connect the e-match leads to the pyro screw
terminals as usual... no off-board connections are required.
-Here's a photo showing the a TeleMega board wired this way:
+Note that when using a separate pyro battery in this way, only the "main"
+battery will be charged by the on-bard LiPo charger. You will need to make
+arrangements to charge the pyro battery if it's a rechargeable variety.
+
+Here's a photo showing a TeleMega board wired this way:
<img src="TeleMegaSepPyro.jpg"/>
projects / web / altusmetrum / blobdiff