Easy Motor

EasyMotor is designed for in-flight characterization of research rocket motors. It records chamber pressure and acceleration to an on-board flash memory chip, the contents of which can be downloaded after flight over USB.

Features

User View

• Data logger storing motor chamber pressure and acceleration
• works with inexpensive 5V analog output pressure sensors
• USB for configuration, data recovery, and battery charging
• Designed for use with a single-cell LiPo battery
• 1.5 x 0.8 inch board

Developer View

• Hardware Features

  • NXP LPC11U14 System-on-Chip
    • ARM Cortex-M0 MCU
    • 32k Flash
    • 6k RAM
    • USB 2.0
    • 8 12-bit analog inputs
    • I2C, SPI, async serial
    • digital I/O
  • Analog Devices ADXL375 3-Axis Digital MEMS Accelerometer
    • +- 200g full-scale
    • on-chip digitizer
  • on-board USB-based charger for single-cell LiPo battery
  • low noise 5V switching regulator to power pressure sensor
  • precision divider with 0.1% resistors to scale pressure sensor analog output to match SOC analog input voltage range

• 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

  • lepton-eda for schematic capture
  • pcb-rnd for PCB layout
  • GCC compiler and source debugger

• Licenses

  • The hardware is licensed under the TAPR Open Hardware License
  • The software is licensed GPL version 2

Mounting examples can be found here:

https://altusmetrum.org/EasyMotor/

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Earn Discount: $3.60