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
13 charges. We also want to experiment with better circuits for testing igniter
14 continuity, with the hope of being able to measure actual resistance and not
21 * Small circuit board mounted near [TeleMetrum](../TeleMetrum/)
22 * Requires [TeleMetrum](../TeleMetrum/) v0.2 or later, as v0.1 does not
23 have the required companion board interface
24 * Connections for 8 distinct igniter firing channels provided
25 * Supports use of separate battery for ejection charges
27 ### Developer View ###
30 * [Atmel ATmega32U4](http://www.atmel.com/dyn/products/product_card.asp?category_id=163&family_id=607&subfamily_id=760&part_id=4317) Microcontroller
32 * 2.5k + 832 bytes SRAM
34 * 12-channel 10-bit ADC
35 * SPI target interface
36 * USB interface which can be used for programming
37 * In-system programming interface
38 * Honeywell HMC5843 3-axis magnetic flux sensor
39 * Software Features (planned)
40 * programmed in C using gcc-avr
41 * Runs from on-chip flash, uses on-chip RAM
43 * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
45 * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
46 * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
50 A schematic and PC board design exist on [git.gag.com](http://git.gag.com)
51 in the project [hw/telepyro](http://git.gag.com/?p=hw/telepyro;a=summary),
52 but no prototypes have been built yet.
56 Prototype circuit boards are in hand, and we hope to build some up and test
57 them during the summer of 2011.