3 This is an RF interface designed primarily for use as a ground station
4 interacting with a [TeleMetrum](../TeleMetrum/) altimeter on board a high
5 power model rocket. The primary computer interface is USB, but async serial
6 and SPI are also available as alternatives. The RF filter components are
7 by default set for use in the vicinity of 435 Mhz, but can be altered to
8 support other frequency ranges.
10 <img src="v0.2/cimg5556-small.jpg">
16 * 70cm ham-band transceiver for interaction with [TeleMetrum](../TeleMetrum/)
17 * programmed for 38k4 GFSK data rate with forward error correction
18 * USB interface for power, configuration, and data interface
19 * 4 pin Tyco MicroMaTch connector for debug and flash programming
20 * 8 pin Tyco MicroMaTch connector supports serial or SPI interface
21 * 1.1 x 1.1 inch 2-layer board, fits inexpensive Hammond 1551 plastic enclosure
23 ### Developer View ###
25 * [TI CC1111F32](http://focus.ti.com/docs/prod/folders/print/cc1111f32.html) Low Power RF System-on-Chip
26 * Sub-1Ghz transceiver
31 * 6 12-bit analog inputs (11 bits with single-ended sensors)
32 * 2 channels of serial I/O
34 * 100mA 3.3V LDO regulator
35 * takes input from USB interface by default
36 * output appears on 8-pin companion connector
37 * can take input from 8-pin companion connector in non-USB applications
39 * Written mostly in C with some 8051 assembler
40 * Runs from on-chip flash, uses on-chip RAM
41 * USB serial emulation for data interface
43 * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
44 * [SDCC](http://sdcc.sourceforge.net/) compiler and source debugger
46 * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
47 * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
49 ## [Production History](../production) ##
53 The hardware design current gEDA files are available from
54 [git.gag.com](http://git.gag.com) in the project
55 [hw/teledongle](http://git.gag.com/?p=hw/teledongle;a=summary).
57 For those who don't have ready access to the gEDA suite, here are pdf snapshots
58 of files in more easily readable form.
60 * [schematic](v0.2/teledongle.pdf)
61 * [pcb artwork](v0.2/teledongle.pcb.pdf)
62 * [bill of materials](v0.2/partslist.csv)
64 This board is an integral part of a [TeleMetrum](../TeleMetrum/) system, and
65 the firmware for both share common elements. More details, including full
66 source code and pre-built packages can be found on the
67 [AltOS](../AltOS) page on this site.
71 An initial batch of TeleDongle v0.2 boards are currently at our assembler. If
72 they work as expected, we hope to have TeleDongle for sale in early March 2010.