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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
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