[[!meta title="TelePyro"]]
# 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 [TeleMetrum](../TeleMetrum/) v0.2 or later, as v0.1 does not
have the required companion board interface
* Connections for 8 distinct igniter firing channels provided
* Supports use of separate battery for ejection charges
### Developer View ###
* Hardware Features
* [Atmel ATmega32U4](http://www.atmel.com/dyn/products/product_card.asp?category_id=163&family_id=607&subfamily_id=760&part_id=4317) Microcontroller
* 32k Flash
* 2.5k + 832 bytes SRAM
* 1k EEPROM
* 12-channel 10-bit ADC
* SPI target interface
* USB interface which can be used for programming
* In-system programming interface
* Honeywell HMC5843 3-axis magnetic flux sensor
* Software Features (planned)
* programmed in C using gcc-avr
* 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)
## Artifacts ##
A schematic and PC board design exist on [git.gag.com](http://git.gag.com)
in the project [hw/telepyro](http://git.gag.com/?p=hw/telepyro;a=summary),
but no prototypes have been built yet.
## Future Plans ##
In late September 2011, v0.1 prototype boards were loaded and lightly
tested. They were never flown. The prototypes of TelePyro were lost in the
[Black Forest Fire](http://www.gag.com/blackforestfire.html), and have not
been replaced.
If we ever get back to this project, the first thing we'll want to do is toss
out the current design and start over, using an ARM Cortex SOC and our "new
pyro circuit" that completely prevents processor brown-out.
## 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 [TeleMetrum](../TeleMetrum/) v0.2 or later, as v0.1 does not
have the required companion board interface
* Connections for 8 distinct igniter firing channels provided
* Supports use of separate battery for ejection charges
### Developer View ###
* Hardware Features
* [Atmel ATmega32U4](http://www.atmel.com/dyn/products/product_card.asp?category_id=163&family_id=607&subfamily_id=760&part_id=4317) Microcontroller
* 32k Flash
* 2.5k + 832 bytes SRAM
* 1k EEPROM
* 12-channel 10-bit ADC
* SPI target interface
* USB interface which can be used for programming
* In-system programming interface
* Honeywell HMC5843 3-axis magnetic flux sensor
* Software Features (planned)
* programmed in C using gcc-avr
* 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)
## Artifacts ##
A schematic and PC board design exist on [git.gag.com](http://git.gag.com)
in the project [hw/telepyro](http://git.gag.com/?p=hw/telepyro;a=summary),
but no prototypes have been built yet.
## Future Plans ##
In late September 2011, v0.1 prototype boards were loaded and lightly
tested. They were never flown. The prototypes of TelePyro were lost in the
[Black Forest Fire](http://www.gag.com/blackforestfire.html), and have not
been replaced.
If we ever get back to this project, the first thing we'll want to do is toss
out the current design and start over, using an ARM Cortex SOC and our "new
pyro circuit" that completely prevents processor brown-out.