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Teams in Engineering Service TIES

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Teams in Engineering Service TIES

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    1. Middle School Environmental Education Spring 2008

    2. Background NSF grant to encourage middle school girls to develop and maintain an interest in science and engineering Our approach: Create county-wide network of low-cost outdoor PM sensors Develop and teach curriculum based on sensor network Assist I-TEST teachers

    3. Goals Long-term goal Inspire middle school girls to gain an interest in science and engineering Quarterly goals Design and test feedback control system Create wireless network to access PM data Develop lesson plan Test Antarctica game and provide feedback Assist teachers with I-TEST lessons Mount PM system on Preuss

    6. Expand Your Horizons Global warming lesson plan topic YouTube videos used to show polar bears as indicator species Greenhouse gases discussion Demonstration of the Convection Cycle

    8. Eye Sensor Demonstration Objective: Introduce concept of sensors in easily relatable terms Demonstrate that eyes act as sensors

    9. Photoresistor Sensor Experiment Students create their own sensors Photoresistor connected to multimeter Flashlight shined on paper under photoresistor Photoresistor detects light reflected off paper

    10. Solar Power Lesson Plan Discussion of renewable v. non-renewable energy Students shine flashlight on small solar panel connected to voltmeter Position of light varied and resulting voltage measured Students learn how solar panels work

    11. Interactive Website Hosted on the TIES server Will allow students to upload/view PM data Partially operational www.ties.ucsd.edu/ITEST

    12. Collaborative Educational Game

    14. Environment Control Main goal: Make the PM sensor suitable for outdoor environment How It Will Be Done: Program the Basic Stamp microcontroller to control the humidity of air flowing through the sensor system Design and fabricate durable and long lasting enclosures for electronic components

    15. How the System Works Why Humidity Control: Environmental factors may adversely affect the performance of electrical components “How It Works”: The BS II microcontroller is programmed to maintain a specified relative humidity level by controlling a solid state relay The SSR acts as an on/off switch and when triggered, allows a voltage supply to the heating pad Once ideal RH levels are reached, the BS II microcontroller triggers the SSR to off mode, preventing voltage supply to the heating pad

    16. Essential Components Sensirion Temperature/Relative Humidity Module Omegalux SRFG-103 Heating Pad Basic Stamp II Microcontroller Solid State Relay

    17. Overall Structure & Design NEMA 4X Enclosure Purchased for the Basic Stamp Board of Education built to withstand harsh weather conditions Enclosure Built for the Solid State Relay weather proof and virtually unbreakable

    18. Testing & Analysis Experiments were conducted using a damp sponge, PM sensor system, and Feedback Control Components As the sponge raises the relative humidity level, the feedback control regulates the on/off switch

    19. Fan Control In order to decrease the relative humidity to a desired level, the fan had to be turned off This would help to increase the rate of conduction and reduce the heat loss due to convection

    22. Class1.cs Program currently fetches 8 hours of previously recorded data and writes to an excel file The Ideal case : fetch current streams of data, and update the excel file instantly. A work around : Fetch five minutes of previously recorded data, and write to an Excel file. Lines of code in file have been changed, but testing is needed.

    23. Automation Automate sensor processing by using a matlab file. It extracts excel file data, plots points on to a graph, and uploads it to the TIES website for easy access. Place this file in the windows startup folder, to have it boot every time Windows is started. this has not been implemented File has not been tested yet.

    25. PM Sensor System Mounted! System mounted on the roof of EBU-I Easily accessible location Allows for sustained, long-term testing Simulates actual mounting set-up to be used at middle schools

    26. Budget

    27. Future Plans Continue testing PM sensor system Develop new PM sensor using BASIC Stamp (no Netbotz!) Fabricate and implement hand-held PM sensors Continue I-TEST teacher support Continue developing PM sensor based curriculum

    28. Acknowledgements I-TEST Research Team Steve Roberts Season Mussey, Preuss School Francesco Carusi Jan & Mandy (Best Advisors Ever!)

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