# TeleMetrum
-This is a recording altimeter for high power model rocketry with integrated
-telemetry link.
+This is a recording dual-deploy altimeter for high power model rocketry
+with integrated telemetry link.
+
+<a href="rawfront.jpg"> <img src="rawfront-thumb.jpg"></a>
+<a href="rawback.jpg"> <img src="rawback-thumb.jpg"></a>
## Motivation ##
[BeeLine](http://www.bigredbee.com/BeeLine.htm)
trackers from
[Big Red Bee](http://www.bigredbee.com), and are pretty happy with them.
-They use a PIC processor and a TI Chipcon cc1050 transmitter chip, and
+They use a PIC processor and a TI CC1050 transmitter chip, and
operate in the ham radio 70cm band.
-One weekend while attending a conference together, We got to wondering if
+One weekend while attending a conference together, we got to wondering if
we couldn't adapt one to use as a downlink for the
[AltusMetrum](../AltusMetrum/) altimeter board in addition to direction
finding after flight. That caused us to start thinking about other things
* Serial port for attachment of GPS module
* USB for power, configuration, and data recovery
* Integrated support for LiPo rechargeable batteries
-* Designed to fit 29mm airframe tube
+* Designed to fit 29mm airframe coupler tube
### Developer View ###
-* TI CC1111F32 Low Power RF System-on-Chip
+* [TI CC1111F32](http://focus.ti.com/docs/prod/folders/print/cc1111f32.html) Low Power RF System-on-Chip
* Sub-1Ghz transceiver
* 8051 MCU
* 32k Flash
* 4k RAM
* USB 2.0
* analog, digital, and serial I/O
-* Microchip 25LC1024 CMOS serial EEPROM
+* [Microchip 25LC1024](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en520389) CMOS serial EEPROM
* 128k x 8
* SPI interface
* Various Sensors
- * Freescale MP3H6115A pressure sensor
- * Freescale MMA2202 50g accelerometer
- * Microchip MCP9700A temperature sensor
-* Software Features
+ * [Freescale MP3H6115A](http://www.freescale.com/webapp/search.partparamdetail.framework?PART_NUMBER=MP3H6115A6U) pressure sensor
+ * [Freescale MMA2202EG](http://www.freescale.com/webapp/search.partparamdetail.framework?PART_NUMBER=MMA2202EG) 50g accelerometer. Can use 40-200g variants!
+ * [Microchip MCP9700A](http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en027103) temperature sensor
+* Software Features (planned)
* Written mostly in C with some 8051 assembler
* Runs from on-chip flash, uses on-chip RAM, stores flight data to
serial EEPROM chip
* USB serial emulation for "console" interface
- * Uses the SDCC compiler and FreeRTOS
+ * USB mass storage emulation for data recovery
+* Tools Used
+ * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
+ * [SDCC](http://sdcc.sourceforge.net/) compiler and source debugger
+ * [FreeRTOS](http://www.freertos.org/) kernel
* Licenses
- * The hardware is licensed under the TAPR OHL
- * The software is licensed GPL version 2
+ * 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 ##
The hardware design current gEDA files are available from
-[git.gag.com](git.gag.com).
+[git.gag.com](http://git.gag.com).
-As of 1 January 2009, the parts and stencil for the v0.1 have arrived, and
-we're waiting for the raw PC boards! Stay tuned for updates, and note that
-Bdale will be giving an update in his session at Linux Conference Australia
-in late January...
+As of 6 January 2009, the raw boards are here, so we're nearly ready to try
+building our first prototype!
projects / web / altusmetrum / blobdiff