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Force Transducer for Inventory Management

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Force Transducer for Inventory Management FORCE TRANSDUCER FOR INVENTORY MANAGEMENT By Austin Adee and Trever Hoye Senior Project ELECTRICAL ENGINEERING DEPARTMENT California Polytechnic State University San Luis Obispo 2015 EE 462 – Final Report Force Transducer for Inventory Management Dr. Wayne Pilkington December 4, 2015 Austin Adee & Trever Hoye Table of Contents Table of Contents .......................................................................................................................................... 2 Table of Figures and Tables........................................................................................................................... 4 Abstract ......................................................................................................................................................... 5 Introduction .................................................................................................................................................. 6 Customer Needs Assessment........................................................................................................................ 7 Requirements and Specifications.................................................................................................................. 7 Functional Decomposition ............................................................................................................................ 9 Level 0 Block Diagram ............................................................................................................................... 9 Level 1 Block Diagram ............................................................................................................................. 10 Level 2 Block Diagram ............................................................................................................................. 11 User Interface ............................................................................................................................................. 12 Project Planning .......................................................................................................................................... 15 Gantt chart .............................................................................................................................................. 15 Cost Estimate .......................................................................................................................................... 17 Purchased Materials ............................................................................................................................... 18 Project Designing ........................................................................................................................................ 19 Design Choices ........................................................................................................................................ 19 Design Decisions ..................................................................................................................................... 19 Database Structure ............................................................................................................................. 24 Physical Construction .................................................................................................................................. 25 Commercial Construction ....................................................................................................................... 26 Results ......................................................................................................................................................... 27 Conclusion ................................................................................................................................................... 30 References .................................................................................................................................................. 31 ABET Senior Project Analysis ...................................................................................................................... 34 Electrical Files .............................................................................................................................................. 38 Code ............................................................................................................................................................ 39 Views.Py .................................................................................................................................................. 39 urls.py ...................................................................................................................................................... 40 Models.py ............................................................................................................................................... 40 Inventory_list.html .................................................................................................................................. 42 Form_calibration.html ............................................................................................................................ 42 Base.html ................................................................................................................................................ 43 Style.css ................................................................................................................................................... 44 Table of Figures and Tables Figure 1: Level 0 Block Diagram of force transducer system ........................................................................ 9 Figure 2: Level 1 Block Diagram .................................................................................................................. 10 Figure 3: Level 2 Block Diagram .................................................................................................................. 11 Figure 4 : PCB Board Desgin in Container ................................................................................................... 12 Figure 5: Comlpete system inside Container .............................................................................................. 12 Figure 6: Django Administration Home Screen........................................................................................... 13 Figure 7: Add Container Screen .................................................................................................................. 13 Figure 8 : Add Item Django Screen.............................................................................................................. 13 Figure 9: Inventory Database Display ......................................................................................................... 14 Figure 10: Gantt chart EE 460 ..................................................................................................................... 15 Figure 11: Gantt chart EE 461 ..................................................................................................................... 15 Figure 12: Gantt chart EE 462 ..................................................................................................................... 16 Figure 13: Resistive Array Approach ........................................................................................................... 20 Figure 14: Proprietary force sensitive material held to light ...................................................................... 20 Figure 15: Analog Mux ................................................................................................................................ 20 Figure 16: Rigid fame approach .................................................................................................................. 21 Figure 17: Rigid frame, pad detail ............................................................................................................... 21 Figure 18: HDPE Based Design .................................................................................................................... 22 Figure 19: FR4 Based Design ....................................................................................................................... 22 Figure 20: Bladder based pressure design .................................................................................................. 23 Figure 21: Honeywell SMT force sensor ..................................................................................................... 23 Figure 22: Improved Bladder Design........................................................................................................... 23 Figure 23: Database Schema ...................................................................................................................... 24 Figure 24: Top of PCB with components mounted ..................................................................................... 25 Figure 25: Vinyl covering PCB board showing physical construction ......................................................... 25 Figure 26 : Test results for Pennies (2.5 grams) .......................................................................................... 27 Figure 27 Test results for Nickels (5 grams) ................................................................................................ 28 Figure 28: Test
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