-# MegaMetrum
-
-This is a high-end recording dual-deploy altimeter for high power model
-rocketry with integrated GPS and telemetry link. The features included
-make MegaMetrum the ideal choice for complex projects including sustainers
-on multi-stage projects.
-
-For the latest MegaMetrum firmware and related ground station software, please
-visit the [AltOS](../AltOS) page on this site.
-
-These are photos of the first v0.1 prototype:
-
-<a href="v0.1/megametrum-v0.1-top.jpg"> <img src="v0.1/megametrum-v0.1-top-thumb.jpg"></a>
-<a href="v0.1/megametrum-v0.1-bottom.jpg"> <img src="v0.1/megametrum-v0.1-bottom-thumb.jpg"></a>
-
-## Features ##
-
-### User View ###
-
-* Recording altimeter for high power model rocketry
-* Supports dual deployment and additional pyro events (can fire 6 charges)
-* 70cm ham-band transceiver for telemetry downlink
-* Barometric pressure sensor good to 100k feet MSL
-* 1-axis 105-g accelerometer for motor characterization
-* 3-axis 18-g accelerometer for gyro calibration
-* 3-axis 2000 deg/sec gyros
-* 3-axis magnetic sensor
-* On-board, integrated GPS receiver
-* On-board non-volatile memory for flight data storage
-* USB for power, configuration, and data recovery
-* Integrated support for LiPo rechargeable batteries
-* User choice of pyro battery configuration, can use primary LiPo or any
- customer-chosen separate pyro battery up to 12 volts nominal.
-* 3.25 x 1.25 inch board designed to fit inside 38mm airframe coupler tube
-
-### Developer View ###
-
-* Hardware Features of v0.1
- * ST Micros [STM32L151](http://www.st.com/internet/mcu/product/248821.jsp) ARM Cortex M3 based Microcontroller
- * TI [CC1120](http://www.ti.com/product/cc1120) High Performance RF Transceiver for Narrowband Systems
- * 150mA 3.3V LDO regulator
- * [Winbond W25Q64CV](http://www.winbond.com/hq/enu/ProductAndSales/ProductLines/FlashMemory/SerialFlash/W25Q64CV.htm) serial flash memory
- * [SkyTraq](http://www.skytraq.com.tw/) Venus634FLPx GPS receiver
- * on-board [Taoglas AP.17A.01](http://www.taoglas.com/antennas/GPS_Antennas/Internal_GPS_-_Active_Patch_Modules/)
- single-stage active patch antenna
- * U.FL connector with 3.3V DC can be re-purposed for optional external amplified antennas
- * async serial interface
- * Measurement Specialties [MS5607](http://www.meas-spec.com/product/t_product.aspx?id=8499) Micro Altimeter Module
- * Wide range — 120kPa to 1kPa (approximately -1500m to 31000m)
- * High precision — 2.4Pa resolution (approximately 20cm at sea level)
- * Factory calibrated.
- * Freescale [MMA655x](http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MMA65xx&fsrch=1&sr=1) Single Axis SPI Intertial Sensor
- * +- 105g or 120g full-scale
- * on-chip 12-bit digitizer
- * Invensense [MPU-6000](http://invensense.com/mems/gyro/mpu6050.html) Six-Axis MEMS Motion Tracking Device
- * tri-axis angular rate sensor up to 2000 degrees/second
- * tri-axis accelerometer with +- 16g range
- * three on-chip ADCs for true simultaneous sampling of all axes
-* Software Features
- * Written mostly in C with some ARM assembler
- * Runs from on-chip flash, uses on-chip RAM, stores flight data to serial flash
- * USB serial emulation for "console" interface
-* Tools Used
- * [gEDA](http://www.gpleda.org/) for schematic capture and PCB layout
-* 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 ##
-
-There is a single manual for MegaMetrum and most other Altus Metrum products,
-which is available in [html](../AltOS/doc/altusmetrum.html) and
-[pdf](../AltOS/doc/altusmetrum.pdf) formats.
-
-The hardware design current gEDA files are available from
-[git.gag.com](http://git.gag.com) in the project
-[hw/megametrum](http://git.gag.com/?p=hw/megametrum;a=summary).
-
-## Future Plans ##
-
-MegaMetrum v0.1 prototypes are working and flight testing is underway. This
-version was shown publicly at NARCON 2013.
-
-Several changes to the hardware to improve performance and reliability
-resulted in a v0.2 prototype version, however feedback from conversations at
-NARCON caused us to sort of "skip" doing much with this version.
-
-As of late March 2013, we're waiting for v0.3 raw circuit boards to come back
-from fab. These have an improved pyro control circuit and u-blox GPS
-receiver.
-
-We hope to offer this product in time for the North American 2013
-flying season.