Table of Contents
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Project Background
The goal of this project is to redesign and improve the existing air quality monitor currently in use by Dr. James Myers who is using this device to conduct research in developing countries. The device is used to collect quantifiable data on particulate matter from home environments, which include cooking and heating fires. The biomaterials currently being used as fuel for fires in developing countries contains materials ranging from construction debris and excrement to conventional heating materials. The current device being used only measures particulate matter and temperature, and there are issues with the sensors’ durability and cost.Problem Statement
The primary objective of this project is to improve data collection while simultaneously lowering cost and improving robustness in an effort to make research easier and more cost effective for Dr. Myers and other researchers. In order to facilitate this, a longer battery life and individual gas sensors are being explored for use.Objectives/Scope
- Improve overall monitor durability
- The ability to monitor individual gas levels,environmental factors, and particulate matter and record them for later analysis
- Devise a method to interface with the device to obtain data
Assumptions & Constraints
- Team must learn how existing gas sensors work, and how they are used to track and record particle levels
- Proposed budget is $500-$650 and must include a greater number of features than the existing air monitor
- Device must function in both high and low humidity environments and provide accurate readings (i.e. Haiti and Kosovo)
Customer Needs
Functional Decomposition
Specifications
Specification TableHouse of Quality
House of QualityConcept Development (generation, improvement, selection)
Sensor Types | Selected Sensors | Cost | Information |
---|---|---|---|
CO | MQ-7 Gas Sensor (C9O) | $7.25 | Link |
PM | PPD42NS | $15.50 | Link |
Temp&Humid | SHT15 | $28.95 | Link |
RealTime Clock | RV2123C2 | $9.00 | Link |
NO2 | e2v | $95.16 | Link |
Additional Information |
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Pugh System |
Microcontroller family chosen msp430 Link |
Systems Architecture
Risk Assessment
Risk Assessment- Continuously Updated
Work Breakdown Structure
- Continuously Updated
- Note use of multiple sheets
Questions
Mechanical:
- Tips on culture and style (What would be considered
unobtrusive?)
- Suggestions of construction and material types and
processes
- How to test sensors
- Ideas for testing facilities (locations)
- Techniques to mount the device (Location in home and
How?)
Electrical:
- Power Management
- Safe and efficient power distribution between
multiple sensors
- Safe and efficient power distribution between
multiple sensors
- Feasibility of a rechargeable battery
- Sensor output
- Feasibility of analog vs. digital outputs in both
hardware and software applications
- Ideas for easier analog conversion
- Feasibility of analog vs. digital outputs in both
hardware and software applications
- Visible warnings and their effect on the battery
life
- Feasibility of combining humidity and temperature
sensors as opposed to individual sensors (advantages or
disadvantages)
Computing:
- How to test sensors (with regards to hardware and the
software interface)
- Ideas for testing facilities
- Efficient controllers and sensors
- Low power
- Power management
- Low power
Chemical:
- How to test sensors
- Potential testing locations (within RIT or
elsewhere)
- Feasibility of combining humidity and temperature
sensors as opposed to individual sensors (advantages or
disadvantages)
Action Items
- Customer Needs-
- Size of monitor to footprint of monitor
- Specifications-
- Define Resolution
- How will we test
- System Architecture-
- Air Needs to come out of system
- Signal conditioning for signals coming out
- Sensors be on all time?
- Power management
- Temperature Indicator (switch), turn on/off sensors
- Calibrate Monitor Block
- Risks-
- Adequate analysis (simulation, simulate design)
- What are we going to do? (No adjectives, Mitigation)
- Mitigation needs to be in Project Plan
- Gantt Chart (more milestones, more detail on chart)
- Sub heading detail in Gantt Chart
- Concept Development-
- Need to compare to Datum (current monitor)
- Build for lower cost from sp
- Consider Ion sensor for PM
- Definition