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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.
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