add fledgling TelePyro and TeleTerra pages

[web/altusmetrum] / TelePyro / index.mdwn

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+# TelePyro
+
+This is an 8-channel pyro expansion board for [TeleMetrum](../TeleMetrum/).
+
+## Motivation ##
+
+It would be nice to support more than the 2 channels of igniter control
+included in the stock [TeleMetrum](../TeleMetrum/) design, so that we can
+fly more complex projects involving staging, air starts, and backup ejection
+charges.
+
+## Features ##
+
+### User View ###
+
+* Small circuit board mounted near [TeleMetrum](../TeleMetrum/)
+* Requires rework of [TeleMetrum](../TeleMetrum/) to replace onboard igniter
+channels with cable providing access to LiPo power and implementing 
+I2C protocol.
+* Connections for 8 distinct igniter firing channels provided
+* Supports use of separate battery for ejection charges
+
+### Developer View ###
+
+* [Microchip 16F882](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en530146) Microcontroller
+       * 3.5k Flash
+       * 128 bytes RAM
+       * I2C target interface
+       * In-circuit programming interface
+* Software Features (planned)
+       * Written in PIC assembler
+       * Runs from on-chip flash, uses on-chip RAM
+* Tools Used
+       * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
+* Licenses
+       * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
+       * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
+
+## Problems ##
+
+* Since we didn't anticipate this design, [TeleMetrum](../TeleMetrum/) needs
+minor rework to interface with this board.
+
+## Artifacts ##
+
+As of 11 April 2009, an incomplete schematic exists, but nothing is 
+published yet.