3 This is an 8-channel pyro expansion board for [TeleMetrum](../TeleMetrum/).
5 <a href="v0.1/telepyro-top.jpg"> <img src="v0.1/telepyro-top-thumb.jpg"></a>
6 <a href="v0.1/telepyro-bottom.jpg"> <img src="v0.1/telepyro-bottom-thumb.jpg"></a>
10 It would be nice to support more than the 2 channels of igniter control
11 included in the stock [TeleMetrum](../TeleMetrum/) design, so that we can
12 fly more complex projects involving staging, air starts, and backup ejection
19 * Small circuit board mounted near [TeleMetrum](../TeleMetrum/)
20 * Requires [TeleMetrum](../TeleMetrum/) v0.2 or later, as v0.1 does not
21 have the required companion board interface
22 * Connections for 8 distinct igniter firing channels provided
23 * Supports use of separate battery for ejection charges
25 ### Developer View ###
28 * [Atmel ATmega32U4](http://www.atmel.com/dyn/products/product_card.asp?category_id=163&family_id=607&subfamily_id=760&part_id=4317) Microcontroller
30 * 2.5k + 832 bytes SRAM
32 * 12-channel 10-bit ADC
33 * SPI target interface
34 * USB interface which can be used for programming
35 * In-system programming interface
36 * Honeywell HMC5843 3-axis magnetic flux sensor
37 * Software Features (planned)
38 * programmed in C using gcc-avr
39 * Runs from on-chip flash, uses on-chip RAM
41 * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
43 * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
44 * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
48 A schematic and PC board design exist on [git.gag.com](http://git.gag.com)
49 in the project [hw/telepyro](http://git.gag.com/?p=hw/telepyro;a=summary),
50 but no prototypes have been built yet.
54 As of late September 2011, v0.1 prototype boards are loaded and under test.