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Project-Mach-1

Flight Computer

Rocket flight computer requirements:

  • flexible for two stage or one stage rocket
  • must have buzzer
  • must have flashing LEDs to help with recovery on the ground
  • must have usb programmer and possibly for accessing stored data
  • 3 mosfets for rocket trigger, parachute triggering, spare
  • rocket to ground telemetry link
  • GPS for tracking and recovery
  • runs at 3.3V logic levels(CMOS)
  • 9 dof acclermoeter, gyroscope, compass. Max accleration would be 20g
  • pressure(and temperature) sensor to measure altitude
  • current sensing to see the amount of current going into fuses
  • Mosfet must be able to supply 1.2 amps for at least 10milliseconds. Bridge wire resistance is 1.2-1.8 Ohms
  • Must be able to run for at least 1 hour continueously
  • must be hand solderable. Perferably
  • 100Hz sample rate from sensors(except GPS)
  • must record data continueously for at least 3min
  • 14 parameters to record: 4 characters:{accl_x, accl_y, accl_z, gyro_x, gyro_y, gyro_z, compass_x, compass_y, compass_z} + 6 characters:{pressure}+ 3 characters:{temperature}+ 7 characters{Longitude, latitude}+4 characters:{altitude} Assuming ascii encoding, 504 bits per string for raw data. Including commas and carriage return, each reading is ~600 bits.
  • Total data storage required: 600bits * 60s * 100hz * 3min = 10.8 Mbits = 10800000 bits

Major components of V1.1 flight computer

  • ST Microelectronics H3LIS100DL: 100g 3-axis accelerometer
  • ST Microelectronics LSM9DS1: 9 degree-of-freedom Accelerometer, Gyroscope and Magnetometer in 3 axis
  • TE Connectivity MS5607: Temperature and pressure sensor
  • Sillicon Labs SI4463: 433 Mhz ISM band Telemetry radio transceiver
  • Ublox MAX M8Q: GPS module
  • Atmel SAMD21J18: Microcontroller 64 pin TQFP package
  • Vishay Si7232DN: Dual N-Channel 20 V (D-S) MOSFET for 2 channel pyros
  • Molex 2066400001: GNSS Active Patch Antenna with Low-Noise Amplifier
  • Winbond w25q64JV: Flash chip 64 Mbytes