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Clean Air Project: Team Big Green SpaceGasm Final Presentation. Hillary Beltran, Edward Crawford, Nicole Harris, Edward Lowe, Emily Proano , and Kevin Wong December 2, 2010. Mission Overview .

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clean air project team big green spacegasm final presentation

Clean Air Project:Team Big Green SpaceGasmFinal Presentation

Hillary Beltran, Edward Crawford, Nicole Harris, Edward Lowe, Emily Proano, and Kevin Wong

December 2, 2010

mission overview
Mission Overview
  • Mission objective: Take measurements of the concentrations of carbon monoxide, carbon dioxide, and methane gases
  • Purpose of Mission: The team’s interest in the quality of air and changes that were recently experienced over the past few years
  • Hypothesis: Concentrations have increased during the course of the year
design overview
Design Overview
  • Three Sensors: CO, CO2, and


  • Arduinoand MicroSD Shield
  • Required Components
      • Camera, Hobo, Heater, and


results and analysis
Results and Analysis
  • microSD memory card failed to store data due to a simple error in code
    • Unable to compare predicted to actual data
  • Colorado Department of Public Health and Environment
    • Does not provide data on carbon dioxide and methane gases as initially expected
      • Team did not closely study what the department did or did not provide
    • Data provided for carbon monoxide is not significant
      • Online archived data dates to March 2008
results and analysis1
Results and Analysis
  • Team able to show expected increase in at least one gas: carbon dioxide
  • Shortfall: Readings taken from Mauna Loa Observatory in Hawaii
results and analysis2
Results and Analysis
  • HOBO temperature data:
flight overview
Flight Overview
  • Sensors were functional but could not store data on microSD memory card
  • Camera took images but memory card filled about halfway through the flight
  • HOBO successful took and stored internal and external temperatures and relative humidity
  • Heater system function (minimum internal temperature: -2.90°C)
  • Structure suffered minimal damages
failure analysis
Failure Analysis
  • Not structural error
    • The structural suffered minimal damages
    • Internal components suffered no damages
  • Not electrical error
      • All the connections were present
  • Failure rooted in software


Big Green SpaceGasm

Java Code to be uploaded to Arduino


//Add the SdFat Libraries

#include <SdFat.h>

#include <SdFatUtil.h>

#include <ctype.h>

//Create the variables to be used by SdFat Library

Sd2Card card;

SdVolume volume;

SdFile root;

SdFile file;

char name[] = "BGSGfinaldata1.txt"; //Create an array that contains the name of our file.

char contents[256]; //This will be a data buffer for writing contents to the file.

char in_char=0;

int index=0; //Index will keep track of our position within the contents buffer.

String inin;

intsensorValueCO = 0;

intsensorValueCH = 0;

int sensorValueCO2 = 0;

String CO;

String CH;

String CO2;


char name[] = "BGSGfinaldata1.txt";

Final Code Used on Launch Day


Correct Code That Will Be Used Next Launch

char name[] = "test1.txt";

  • Data from external sources remain inconclusive
  • However, learned much from our failures
    • Now able to store the data that was recorded during flight
    • Find more reliable external source with which to compare our data
  • Re-flight in April 2011 highly anticipated and will yield conclusive data
lessons learned
Lessons Learned
  • Carbon dioxide sensor short circuited due to too high of voltage/current
  • Camera should take images over longer time intervals
  • Conduct more system tests, namely for sensors and software
    • Ensure sensors taking data
    • Data being stored on microSD card and is retrievable
flight readiness
Flight Readiness
  • Source of error has been traced to the code
    • Error was repeated with various tests done to affirm the source of error lay with code
    • Code rewritten and error solved
  • Structure does not need to be mended
  • For re-flight, new batteries with Velcro and a new CO2 sensor will be needed
  • Must be stored in dry, cool area
message to next semester
Message to Next Semester
  • Course is challenging, but an invaluable and exciting learning experience
  • Communication, among others, is crucial
    • Subsystems can have own timetable
    • During full systems testing, each subsystem must be functional
      • If not, testing cannot continue until addressed
  • Time is not an ally
  • K.I.S.S. model – Keep It Simple Stupid
    • Given a measure of freedom
    • Remember constraints on costs, weight, and time