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COLLIDE-3 AVM. Walter Castellon CpE & EE Mohammad Amori CpE Josh Steele CpE Tri Tran CpE Sponsored by: Dr. Josh Colwell. Background. Planetesimal to Protoplanet to Planet is well understood Have gravitational forces Prior to this stage is still unclear

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collide 3 avm

COLLIDE-3 AVM

Walter Castellon CpE & EE

Mohammad AmoriCpE

Josh Steele CpE

Tri Tran CpE

Sponsored by:

Dr. Josh Colwell

background
Background
  • Planetesimal to Protoplanet to Planet is well understood
    • Have gravitational forces
  • Prior to this stage is still unclear
    • How do the particles stick together?
  • High velocity vs Low velocity impacts
    • Do they hold the key?
the experiment
The Experiment
  • COLLIDE-3 will be attached to a sub-orbital rocket
  • Upon entering micro-gravity LED’s and a Camera will be turned on to record the experiment
  • Next a spherical quartz object will be dropped onto dust/simulant
  • The camera will record the results of the quartz object and dust/simulant in micro-gravity
the problem
The Problem
  • COLLIDE-3 scheduled to fly on private, experimental suborbital rocket
    • This rocket had an AVM module which would control all of the functions of COLLIDE-3
  • The rocket had problems, and was no longer available to us
    • Dr. Colwell was left with an experiment, but no way to run it
    • Needed a new AVM if he wished to utilize his experiment on a different rocket.
avm avionics module
AVM (Avionics Module)
  • Brain of experiment
  • Manages hardware/power
  • Runs COLLIDE-3
  • Record results
  • Store results
requirements
Requirements
  • Connected to 28VDC source and 120VAC sources
  • Low weight
  • High vibration resistance
  • Fully automated
  • Capable of recording greater than 80fps at 640x480 at times ranging from 30s-2m
  • User friendly
  • External access to flight variables
    • Experiment must always update with these new variables
  • Cost efficient
hardware block diagram
Hardware Block Diagram

SSD

P820

DM

CAMERA

Microcontroller

H48C

MUSCLE WIRE

LEDs

MICROSTEP DRIVER

avm components
AVM Components
  • EPIA P820-12 embedded board
  • Microcontroller
  • Camera
  • LEDs
  • Solid State Drive
  • Accelerometer
  • Display Module
  • Stepper Motor
  • Micro-step driver
  • Muscle wire
  • Wireless Comm
standard components
Standard Components
  • LEDs: 2 LED arrays each array has 48 LEDs
  • Micro-step driver: requires 12v, 5v, PWM
  • Muscle wire: 1 amp of current at 5V
camera
Camera
  • AVM will be able to support both industrial and consumer cameras
  • SVSI “Stream View-LR” and GoPro “HD Hero”
  • GoPro is a consumer camera used during initial experiments to reduce financial loss in case of rocket failure
  • SVSI is an industrial camera that will be used more often in the long run
display module
Display Module
  • Can use either serial or USB interface
  • User friendly software
  • Will allow user to view current experimental variables
display menu
Display Menu
  • Displays all experimental variables
    • Delay after microgravity
    • Delay to record
    • Recording duration
  • Updates every 1 second
external communication
External Communication
  • Rocketfish micro-USB bluetooth adapter
  • Data transfer of 3 Mb/s
  • Range of 20 feet
  • No interference
  • Minimal weight and footprint
wireless access via bt
Wireless Access (via BT)
  • Supported by:
    • Windows XP, Vista, 7
    • MAC OS 10.4 and later
  • Default shared folder is AtMega code
  • Variables will be top 3 lines for ease of access
  • Copy file locally  make changes  copy back to shared folder
solid state drive
Solid State Drive
  • Using SATA II connection write speed is 95 MB/s
  • Shock Resistance is 1,500 G
  • Vibration Resistance 2.17G – 3.13G (Operating – Non-Operating)
accelerometer
Accelerometer
  • Parallax H48C
    • 3-axis readings
    • Unfortunately, support is for

PBASIC language

      • Need conversion for ATMega
    • Reads in voltage outputs from each axis and converts into a G-rating using the following forumula:
      • G = ((axis – vRef) / 4095) x (3.3 / 0.3663)
    • Our code must do this conversion
accelerometer false positives
Accelerometer – False Positives
  • Pins can sometimes falsely detect G-levels
  • Costly mistake that needs to be protected against
    • Will have counter loop that continuously checks flag every .4ms
    • If pin consistently reads zero gravity for set amount of time, it is not a false positive, and experiment can proceed
epia p80 12
EPIA P80-12
  • Hosts the experimental code and the variables that can be changed externally.
  • Uploads procedure code to the microcontroller
  • Activates recording for the camera
  • Handles high speed image transfers from the camera
epia p80 121
EPIA P80-12
  • Cost is $310
  • Windows board
    • Compatible to all cameras
    • Flexible to experimental changes
    • User friendly
  • Excellent hardware and

software support

  • Smaller form factor
microcontroller
Microcontroller
  • Stores experimental variables and procedure
  • Reads in microgravity mode from accelerometer
  • Utilizes relays to activate COLLIDE-3 components
  • Communicates with EPIA P820-12 to power on camera
atmega328
ATMega328
  • 6 dedicated PWM lines
  • Small footprint
  • Meets basic requirements
    • I/O pins
    • Memory (RAM, EEPROM)
    • Serial/USB pins
  • Larger support base
  • C language (all members familiar)
  • Familiarity
ft232r breakout board
FT232R Breakout Board
  • Allows communication between the Arduino program on the P820-12 and the ATMega328
  • Utilizes the ATMega’sTx and Rx lines
power conversion
Power Conversion
  • Rocket will only provide standard AC sources and a 28V DC power supply
  • Our components take 5,6, and 12 volts
    • 12V: Microstep VCC, LEDs
    • 6V: Microstep input, muscle wire
    • 5V: ATMega328
  • Will utilize DC-DC converters and regulators to convert the 28V to usable levels
ec7a 24s12
EC7A-24S12
  • 12V requirements will be handled by CINCON EC7A-24S12
  • Input voltage range of 18-36VDC
  • Output voltage regulated at 12V with output current of 835mA
pt78st106h
PT78ST106H
  • 6V requirements will be

handled by POWER

TRENDS PT78ST106H

  • Takes input voltages

from 9-38V

  • Outputs a constant 6V

voltage at a current of 1 amp

  • Will utilize two of them, since we will use more than 1 amp of current at 6V
lm7805
LM7805
  • Finally, 5V requirements will be handled by a standard LM7805 5V regulator
    • Instead of regulating the 28V input source, this will simply be taking in a 9V battery
imb03c
IMB03C
  • Since the microcontroller cannot provide enough volts/amps to power COLLIDE-3’s components, it will instead activate a relay, which will have a load of the regulated voltages from the

sources previously mentioned

  • We will implement the

AXICOM IMB03C mechanical relay

    • Handles up to 2A of current
    • Functions up to 300g of shock, survives up to 500g of shock
    • 100uV control voltage will switch relay, which can have a load up to 220V
project issues technical
Project Issues(Technical)
  • Communication protocol between EPIA P820-12 and ATmega328 (FT232R)
  • Camera compatibility
  • Changing variables externally
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