Senior Design – Group D Charging Remote Alert Notification Station Department of Electrical Engineering and Computer Science University of Central Florida Dr. Lei Wei Project Design Team: Alexander Masterson CpE & EE Evelin Santana EE Ian Flemings EE Nick Lucas EE Possible Customers: Academic Centers, Businesses, really any facility with a public outdoors area. Sponsors: None at this time. Significant Contributors: None at this time. 1 Table of Contents 1.0 PROJECT EXECUTIVE SUMMARY .................................................................................................. 1 2.0 PROJECT INTRODUCTION ............................................................................................................. 3 2.1 MOTIVATION ..................................................................................................................................... 3 2.2 OBJECTIVES ....................................................................................................................................... 4 2.3 GOALS .............................................................................................................................................. 4 2.4 EXISTING TECHNOLOGY ........................................................................................................................ 4 2.5 BLOCK DIAGRAM ................................................................................................................................ 5 3.0 RESEARCH .................................................................................................................................... 7 3.1 POWER ............................................................................................................................................. 8 3.1.1 Power Requirements.................................................................................................................. 8 3.1.2 Design methodology .................................................................................................................. 9 3.2 COMMUNICATION AND TRANSMISSION ................................................................................................. 12 3.2.1 Communication Topology ........................................................................................................ 12 3.2.2 Networking Topology .............................................................................................................. 14 3.2.3 General Assembly Overview .................................................................................................... 15 3.3 SENSORS ......................................................................................................................................... 18 3.3.1 Analog vs Digital ...................................................................................................................... 18 3.3.2 Sound Sensors .......................................................................................................................... 20 3.3.3 Vibration sensors ..................................................................................................................... 26 3.3.4 Reed Switch ............................................................................................................................. 29 3.3.5 Sensor Microcontroller Selection ............................................................................................. 30 3.4 SECURITY ........................................................................................................................................ 34 3.4.1 Locking Mechanisms ................................................................................................................ 34 3.4.2 Authentication Method ........................................................................................................... 37 3.4.3 Security Microcontroller .......................................................................................................... 44 3.5 ISOLATION AND DAMPING .................................................................................................................. 48 3.5.1 The Noisy Neighbor Problem ................................................................................................... 48 3.5.2 Acoustic Quieting: Isolation vs damping.................................................................................. 49 3.5.3 Damping Sound ....................................................................................................................... 49 3.5.4 Damping and Isolating Mechanical Vibration ......................................................................... 54 3.5.5 Viscoelastic Materials as Vibration Isolators ........................................................................... 57 4.0 PROJECT DESIGN ........................................................................................................................ 61 4.1 HARDWARE DESIGN .......................................................................................................................... 61 4.1.1 The Power Circuit ..................................................................................................................... 61 4.1.2 Modularity consideration ........................................................................................................ 62 4.1.3 Separating Security and Sensor Microcontrollers .................................................................... 62 4.1.4 Sensors Subsystem ................................................................................................................... 64 4.1.5 Security Subsystem .................................................................................................................. 66 4.1.6 Ethernet For Communication ................................................................................................... 72 4.2 PROPOSED SYSTEM SOFTWARE DESIGN ................................................................................................. 74 4.2.1 Terminal ................................................................................................................................... 75 4.2.2 Unit Governor .......................................................................................................................... 75 4.2.3 Box Governor ........................................................................................................................... 76 4.2.4 Lock Controls ........................................................................................................................... 77 4.2.5 Lock Indicate ............................................................................................................................ 79 4.2.6 Fingerprint Scanner ................................................................................................................. 81 4.3 COMMUNICATION PROTOCOLS ............................................................................................................ 83 i 4.3.1 UART ....................................................................................................................................... 83 4.3.2 SPI ........................................................................................................................................... 83 4.3.3 I2C ........................................................................................................................................... 84 4.3.4 SPI vs I2C vs UART ................................................................................................................... 85 4.4 PHYSICAL HOUSING DESIGN ............................................................................................................... 86 5.0 TESTING PLAN ........................................................................................................................... 88 5.1 SOUND SENSOR TESTING ................................................................................................................... 88 5.2 VIBRATION SENSOR TESTING .............................................................................................................. 95 5.3 SECURITY CONTROLLER TESTING ......................................................................................................... 98 5.3.1 Solenoid Lock Testing .............................................................................................................. 99 5.3.2 Fingerprint Scanner Testing .................................................................................................... 99 5.3.3 Event and Collision Detector / Basic Network ....................................................................... 102 5.4 COMPONENT TESTING..................................................................................................................... 104 5.4.1 Methodology for testing ....................................................................................................... 104 5.4.2 Voltage Regulator ................................................................................................................. 106 5.4.3 Level shifter with 5V Switching Regulator ............................................................................ 107 5.4.4 PCA9306 ................................................................................................................................ 109 6.0 STANDARDS AND CONSTRAINTS