# TeleMini

This is a very small, baro-only recording dual-deploy altimeter for 
model rocketry with integrated telemetry link.  

## Motivation ##

We'd like to fly smaller rockets really high, which motivates an interest
in both electronic deployment and radio direction finding for post-flight
rocket recovery.

## Features ##

### User View ###

* Recording altimeter for model rocketry
* Supports dual deployment (can fire 2 ejection charges)
* 70cm ham-band transceiver for telemetry downlink
* Barometric pressure sensor good to 45k feet MSL
* Designed to use a single LiPo rechargeable battery
* 1.5 x 0.5 inch board designed to fit inside 18mm airframe coupler tube

### Developer View ###

* Hardware Features
	* [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
		* 6 12-bit analog inputs (11 bits with single-ended sensors)
		* 2 channels of serial I/O
		* digital I/O
	* [Freescale MP3H6115A](http://www.freescale.com/webapp/search.partparamdetail.framework?PART_NUMBER=MP3H6115A6U) pressure sensor
* Software Features
	* Written mostly in C with some 8051 assembler
	* Runs from on-chip flash, uses on-chip RAM, stores flight data to
		upper blocks of on-chip flash
* Tools Used
	* [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
	* [SDCC](http://sdcc.sourceforge.net/) compiler and source debugger
* 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 ##

The design files can be found on [git.gag.com](http://git.gag.com) in the 
project [hw/telemini](http://git.gag.com/?p=hw/telemini;a=summary).  

## Future Plans ##

Initial hardware prototypes are assembled and working.  We've flown a number 
flights now, with great results.  Work remains to stabilize the firmware and
associated ground software updates, particularly because we've made a major
update to the telemetry protocol to more easily handle multiple products.

The first production hardware build is underway, and we expect to have 
TeleMini for sale sometime in August 2011, with plenty on hand to sell at
[LDRS 30](http://ldrs30.org/) in early September!