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Flight Readiness Review of Hula-hoop2 Avionics Systems for Leo Hano Rocket

This document outlines the Flight Readiness Review of the Hula-hoop2 avionics system designed for the Leo Hano rocket, detailing hardware specifications, subsystems, and test parameters. It covers dual deployment parachutes, motor configurations (K780R & K1000W), and the critical performance metrics such as drogue and main parachute characteristics. The document also discusses the processing and storage capabilities of the avionics subsystem, including temperature, acceleration, and magnetic field sensing using various ADC technologies.

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Flight Readiness Review of Hula-hoop2 Avionics Systems for Leo Hano Rocket

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  1. Flight Readiness Review Team Hawaii

  2. Leo HanoFull Scale Low Power March 13, 2011 Motor = K780R

  3. Leo HanoFull Scale Low Power March 20, 2001 Motor = K1000W

  4. Overview

  5. Parachutes • Drogue • 42in • 83.59 ft/sec • Main • 144in • 22.45 ft/sec

  6. Dual Deployment Avionics test • Main Charge • Drogue Charge

  7. rail Exit Velocity • 65.2 ft/sec • Reach safe speed at 66.34 inches

  8. Hula-hoop2 planned features • 2 memory options • Model A: 256 Kbytes – built on multiple circuit boards to be flown on the Leo Hano rocket • Model B: 128 Kbytes – built on one circuit board to be flown on an Executioner rocket • One version of the program code for all units • Variable sample rates – between 1 to 6 samples per second

  9. Hula-hoop2 Subsystems • Controller • Main serial interface • Debug port serial interface • Field Input and Output • Data storage • Sensors & Analog to Digital Convertors (ADC) • Temperature • Acceleration • Magnetic field • 12 bit ADC • Power

  10. Block Diagram – V3

  11. Controller Data Storage Micro Technology 24LC512-I/P EEPROM features: 8 pin DIP capacity of 65,536 bytes or 64 Kbytes per chip I2C interface Memory sizes Model A: 4 chips for 256 Kbytes Model B: 2 chips for 128 Kbytes • Parallax Basic Stamp 2p features: • 24 pin DIP • 8 code and/or data segments at 2 Kbytes per segment • 16 digital Input/Output interfaces • Debug and program upload interface • Voltage regulator at +5 Volts

  12. Sensors Temperature: Acceleration: Parallax’s Freescale MMA7455 Accelerometer features: wider than usual 8 pin DIP SPI or I2C interface – using SPI 3 axis acceleration choices of 2g, 4g or 8 g – using 8g 8 bit or 10 bit resolution – using 8 bit Digital Output Data stream 8 bits in 8 bits out • National Semiconductor LM34 features: • 3 pin TO-92 case • Analog Output • Connected to ADC#2

  13. Sensors: Magnetic Field • Custom built inductors • Analog Output • 3 coils will be used, one for each axis (X, Y and Z) • Each coil will have its own 4 resistor network that will be connected to ADC#1

  14. Analog to digital convertors: 12 bit ADC #1 Analog to digital convertors: 12 bit adc #2 Micro Technology MCP3202 features 8 pin DIP 12 bit resolution 2 single ended input channels SPI interface Data stream 4 bits in 12 bits out • Micro Technology MCP3208 features • 16 pin DIP • 12 bit resolution • 8 single ended input channels • SPI interface • Adjustable voltage reference (.25 to 5 volts) while keeping the device’s power supply at 5 volts. Will be set at 1 volt • Data stream • 6 bits in • 12 bits out

  15. Mahalo

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