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EnHants

EnHants. By: Shakhul Hai. Background. EnHants is an acronym for Energy-Harvesting Active Networked Tags EnHants are small, flexible, and self reliant devices that can be attached to arbitrary objects that are not traditionally networked -Examples: food, books, produce etc.

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EnHants

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  1. EnHants By: ShakhulHai

  2. Background • EnHants is an acronym for Energy-Harvesting Active Networked Tags • EnHants are small, flexible, and self reliant devices that can be attached to arbitrary objects that are not traditionally networked -Examples: food, books, produce etc.

  3. Goal of EnHants • Network- Actively Communicate with one another and with EnHant-friendly devices in order to forward information over a multihop network • Operate at ultra-low power- Spend a few nano-Joules or less on every transmitted bit • Harvest energy- Collect and store energy from sources such as light, motion, temperature gradients

  4. Contd. • Are Energy Adaptive- Alter communications and networking to satisfy energy and harvesting constraints • Exchange small messages- Exchange limited information using low datas, possibly in several transmission bursts • Transmit to short ranges- communicate only when in proximity to one another • Are thin,flexible and small

  5. Materials/Software • Microsoft Excel 2003/ Open Office Spreadsheet • Python • Light Measurement Sensor

  6. Light Sensor

  7. What I Did • My job was to do outdoor and indoor light measurements to see light conditions in different environments/locations.

  8. Procedure • [command In order to start measurements] Python light.py –d –s 0.5 –t 60 –f test.dat • After collecting data, data was transferred over to Microsoft Excel/ Open Office Spreadsheet • Then converted into microwats - Conversion formula: 300Hz*0.1uW/Hz = 30 uW

  9. Contd. • The highest and lowest 2 datas were removed • Average the data • Make a graph of the data

  10. Experiments

  11. Measurements in the EE Conference Room • 3 J/day on average

  12. Shelf ‘map’ • Gil’s office, facing South, 5 `racks’, 7 ‘shelves’ • Each spot measured with and without the indoor lighting

  13. 1.7878 1.4690 2.1793 2.1034 3.3724 1.5959 1.2690 1.8069 2.3793 3.2000 1.4163 1.2000 1.8138 2.4000 3.4966 0.7918 1.2207 1.7379 2.6483 4.1034 0.7020 1.0414 1.5793 2.6000 3.3034 0.8000 0.8966 1.2000 2.9862 2.2966 0.8000 0.8000 1.2000 2.0828 1.2621 Lights off uW/cm^2

  14. 9.0449 14.7793 15.0759 15.3104 14.4621 12.6082 24.9034 29.0069 28.2690 24.8759 20.1470 34.2000 36.4000 40.3034 31.6275 25.5429 36.4345 46.5724 44.6483 35.9242 24.0123 34.7103 43.2069 43.9034 34.5725 24.8857 32.6620 41.2966 39.5241 33.0344 22.2163 27.8776 35.6759 35.0138 30.4482 Indoor light uW/cm^2

  15. Future work • Further long-term data collection, analysis, use in simulations

  16. References • Energy Harvesting Networked Tags (EnHants) Project, Columbia University, http://enhants.ee.columbia.edu

  17. Acknowledgements • Mentor: Maria Gorlatova • Professor Gil [head of the project] • Columbia Electrical Engineering Department • Dr. Sat

  18. THANK YOU

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