3 This is a high-end recording dual-deploy altimeter for high power model
4 rocketry with integrated GPS and telemetry link. The features included
5 make TeleMega the ideal choice for complex projects including sustainers
6 on multi-stage projects.
8 For the latest TeleMega firmware and related ground station software, please
9 visit the [AltOS](../AltOS) page on this site.
11 These are photos of the first v0.1 prototype:
13 <a href="v0.1/megametrum-v0.1-top.jpg"> <img src="v0.1/megametrum-v0.1-top-thumb.jpg"></a>
14 <a href="v0.1/megametrum-v0.1-bottom.jpg"> <img src="v0.1/megametrum-v0.1-bottom-thumb.jpg"></a>
20 * Recording altimeter for high power model rocketry
21 * Supports dual deployment and additional pyro events. Pyro events are
22 configurable and can be based on time and various flight events and status,
23 including angle from vertical.
24 * 70cm ham-band transceiver for telemetry downlink
25 * Barometric pressure sensor good to 100k feet MSL
26 * 1-axis 105-g accelerometer for motor characterization
27 * 3-axis 18-g accelerometer for gyro calibration
28 * 3-axis 2000 deg/sec gyros
29 * 3-axis magnetic sensor
30 * On-board, integrated GPS receiver
31 * On-board non-volatile memory for flight data storage
32 * USB for power, configuration, and data recovery
33 * Integrated support for LiPo rechargeable batteries
34 * User choice of pyro battery configuration, can use primary LiPo or any
35 customer-chosen separate pyro battery up to 12 volts nominal.
36 * 3.25 x 1.25 inch board designed to fit inside 38mm airframe coupler tube
38 ### Developer View ###
40 * Hardware Features of v0.1
41 * ST Micros [STM32L151](http://www.st.com/internet/mcu/product/248821.jsp) ARM Cortex M3 based Microcontroller
42 * TI [CC1120](http://www.ti.com/product/cc1120) High Performance RF Transceiver for Narrowband Systems
43 * 150mA 3.3V LDO regulator
44 * [Winbond W25Q64CV](http://www.winbond.com/hq/enu/ProductAndSales/ProductLines/FlashMemory/SerialFlash/W25Q64CV.htm) serial flash memory
45 * [u-blox](http://www.u-blox.com/) MAX-6Q GPS receiver
46 * on-board [Taoglas AP.17A.01](http://www.taoglas.com/antennas/GPS_Antennas/Internal_GPS_-_Active_Patch_Modules/)
47 single-stage active patch antenna
48 * U.FL connector with 3.3V DC can be re-purposed for optional external amplified antennas
49 * async serial interface
50 * Measurement Specialties [MS5607](http://www.meas-spec.com/product/t_product.aspx?id=8499) Micro Altimeter Module
51 * Wide range — 120kPa to 1kPa (approximately -1500m to 31000m)
52 * High precision — 2.4Pa resolution (approximately 20cm at sea level)
54 * Freescale [MMA6555](http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA65xx&fsrch=1&sr=1) Single Axis SPI Intertial Sensor
56 * on-chip 12-bit digitizer
57 * Invensense [MPU-6000](http://invensense.com/mems/gyro/mpu6050.html) Six-Axis MEMS Motion Tracking Device
58 * tri-axis angular rate sensor up to 2000 degrees/second
59 * tri-axis accelerometer with +- 16g range
60 * three on-chip ADCs for true simultaneous sampling of all axes
62 * Written mostly in C with some ARM assembler
63 * Runs from on-chip flash, uses on-chip RAM, stores flight data to serial flash
64 * USB serial emulation for "console" interface
66 * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
68 * The hardware is licensed under the [TAPR](http://www.tapr.org) [Open Hardware License](http://www.tapr.org/ohl.html)
69 * The software is licensed [GPL version 2](http://www.gnu.org/licenses/old-licenses/gpl-2.0.html)
73 There is a single manual for TeleMega and most other Altus Metrum products,
74 which is available in [html](../AltOS/doc/altusmetrum.html) and
75 [pdf](../AltOS/doc/altusmetrum.pdf) formats.
77 The hardware design current gEDA files are available from
78 [git.gag.com](http://git.gag.com) in the project
79 [hw/telemega](http://git.gag.com/?p=hw/telemega;a=summary).
83 TeleMega v0.1 prototypes worked and were flown on a number of test
84 flights. This version was shown publicly at NARCON 2013.
86 Several changes to the hardware to improve performance and reliability
87 resulted in a v0.2 prototype version, however feedback from conversations at
88 NARCON caused us to sort of "skip" doing much with this version.
90 Version 0.3 prototypes are built and working, with an improved pyro control
91 circuit and u-blox GPS receiver.
93 The first test flight of v0.3 was on 19 May 2013, and the results look
94 great! We plan more tests at [NSL 2013](http://nsl2013.org), and if all
95 continues to go well, we hope to introduce this product in July, 2013.