tweaking

[web/altusmetrum] / TelePyro / index.mdwn

diff --git a/TelePyro/index.mdwn b/TelePyro/index.mdwn
index 7c342e37ffb6c1933938fa577bed52153b166ee2..57836bccb38be4d9ce650939a0b5d4db92a5a29f 100644 (file)
--- a/TelePyro/index.mdwn
+++ b/TelePyro/index.mdwn
@@ -7,28 +7,32 @@ This is an 8-channel pyro expansion board for [TeleMetrum](../TeleMetrum/).
 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.
+charges.  We also want to experiment with better circuits for testing igniter
+continuity, with the hope of being able to measure actual resistance and not
+just continuity.
 
 ## 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.
+* 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 ###
 
-* [Microchip 16F886](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en530146) Microcontroller
-       * 3.5k Flash
-       * 128 bytes RAM
-       * I2C target interface
-       * In-circuit programming interface
+* [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
 * Software Features (planned)
-       * Written in PIC assembler
+       * 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
@@ -36,12 +40,13 @@ I2C protocol.
        * 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 ##
+## Artifacts ##
 
-* Since we didn't anticipate this design, [TeleMetrum](../TeleMetrum/) needs
-minor rework to interface with this board.
+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.
 
-## Artifacts ##
+## Future Plans ##
+
+We currently plan to build prototypes of TelePyro in Spring 2011.
 
-As of 11 April 2009, an incomplete schematic exists, but nothing is 
-published yet.