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 100k feet MSL
• 1-axis 105-g accelerometer for motor characterization
• 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
• Uses LiPo to fire e-matches, can be made to support separate pyro battery
• 2.75 x 1 inch board designed to fit inside 29mm airframe coupler tube

Developer View

• Hardware Features of v2.0
  • ST Micros STM32L151 ARM Cortex M3 based Microcontroller
  • TI CC1120 High Performance RF Transceiver for Narrowband Systems
  • 150mA 3.3V LDO regulator
  • Winbond W25Q64CV serial flash memory
  • u-blox MAX-7Q GPS receiver
    • on-board passive patch antenna
    • async serial interface
  • Measurement Specialties MS5607 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 MMA6555 Single Axis SPI Intertial Sensor
    • +- 105g full-scale
    • on-chip 12-bit digitizer
• 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 for schematic capture and PCB layout
• Licenses
  • The hardware is licensed under the TAPR Open Hardware License
  • The software is licensed GPL version 2

Compared with the v1 series, v2 includes a better GPS (uBlox vs Skytraq), higher power radio (40mW instead of 10mW), wider range and more precise pressure sensor (100k' MSL vs 45k' MSL), larger on-board storage (8MB vs 2MB), more precise, wider range accelerometer (12 bits instead of 10 bits, 105g instead of 70g) and faster processor (32-bit ARM instead of 8-bit 8051).