1. ECE 477 Final Presentation Group 3  Fall 2005
Paste a photo of team members with completed project here. Annotate this photo with names of team members.

2. Outline Project overview Block diagram Professional components
Design components
Success criteria demonstrations
Individual contributions
Project summary
Questions / discussion

3. Project Overview
P.E.T. Express uses RF-ID technology to control access through a common pet door. The P.E.T. Express utilizes a Motorola MC9S12NE64 and includes feedback ability through an LCD display, embedded web server, and keypad input. These features, along with software controlled permissions, control the locking action of the pet door through the use of pulling solenoids.

4. Block Diagram

5. Professional Components
Constraint analysis and component selection rationale
Patent liability analysis
Reliability and safety analysis
Ethical and environmental impact analysis

6. Constraint Analysis Computational Requirements
Processor is a simple state machine.
Web processor will consume some processing cycles.
Minimal processing will be necessary for serial interfaces of the RF-ID reader and LCD interface.

7. Constraint Analysis Interface Requirements RF-ID reader
1-2 ft desired range
LCD interface
8 or 16-pin parallel connection or SPI/SCI connection.

8. Constraint Analysis Keypad interface
Number of keys to hardware I/O pin ratio
Solenoid connection circuit
Isolated voltage supply from the processor.
Ethernet controller
Embedded Ethernet support.

9. Constraint Analysis Power Supply Constraints
Various voltage requirements
Ample current
Battery backup system

10. Constraint Analysis Packaging and size/weight requirements Aesthetics
Antenna and RF-ID reader circuits.
Appropriately sized RF-ID antenna
Solenoid size
LCD and keypad sizes
Usability & Readability

11. Constraint Analysis Rationale for component selection Microprocessor
Motorola HC9S12NE64 (112 pin)
64 Kb Flash
2 serial ports
Embedded Ethernet controller
Ample I/O capability

12. Constraint Analysis RF-ID tag reader Intersoft Medium range
Most cost effective
LCD display
Crystal Fontz
Serial communication
20x4 character display
Group familiarity with code

13. Patent Liability Analysis
Commercially Available Products
Pet Mate Electro-Magnetic Door
Electromagnetic tags
Solo Motorized Door
Line-of-sight sensor, motor driven door
Homeseer 2.0 RFID Starter Kit
Highly adaptable, not necessarily used for pet doors

14. Patent Liability Analysis
Other Patents (Similar)
Patent 6,994,990
RFID controlled, motor driven sliding pet door capable of recognizing pet-specific IDs
Patent 6,141,911
Almost exactly the P.E.T. Express

15. Patent Liability Analysis
Action Required
Avoiding infringement for Patent 6,994,990
P.E.T. Express specifically allows access through a doorway
Avoiding infringement for Patent 6,141,911
Entirely redesign product
Provide royalties
Accept the penalties

16. Reliability/Safety Analysis
5 Components Chosen to Analyze
MC9S12NE64 Microcontroller (1)
LM317 Voltage Regulator (2)
LT1076 5V Regulator (3)
MIC V Voltage Regulator (4)
4N25 Opto Isolator (5)
Criticality Classification
High: Animal (lost or stolen) or human injury/death may occur
Low: Costumer dissatisfaction may occur

17. Reliability/Safety Analysis
Possible Low Criticalities
LCD won’t work
Ethernet crashes or won’t
Keypad won’t work
Possible High Criticalities
Door stays unlocked and is always open
Battery overheats
RFID won’t recognize tag or tags
Door stays locked and won’t open

18. Ethical/Environmental Analysis
Ethical Impact Analysis
Secure wires
Fire Hazard
Entanglement
Serviceability
Warning Labels
Trace Width
Insulation
Protect Circuitry against cold temperatures

19. Ethical/Environmental Analysis
Testing
Mounting of system
Secure against extreme door motion
Hanging wires
Security
Possible security threat with lost tags
RFID tracking ability

20. Ethical/Environmental Analysis
Environmental Impact Analysis
Lead Solder and Etching Chemicals
Battery leaks
Fire Hazard – Large Current
Disposal of device
Contains lead, brominated flame-retardants, cadmium, and barium

21. Design Components Packaging design considerations
Schematic design considerations
PCB layout design considerations
Software design considerations

22. Packaging Design
P.E.T. Express will consist of two main sections: a pet door and a control module.
Pet Door
Houses the solenoids
RFID antenna encircles it.
Control Module
Houses the PCB & peripheral devices
Has power cord and control lines to system

23. Packaging Design

24. Packaging Design

25. Packaging Design

26. Packaging Design

27. Packaging Design

28. Packaging Design
Battery in Open Box Picture

29. Packaging Design
Picture Of Front panel (back view)

30. Packaging Design

31. Packaging Design

32. Packaging Design

33. Packaging Design

34. Packaging Design

35. Packaging Design

36. Packaging Design

37. Schematic Design Power System Overview 18V Input Supply
15V Linear Regulator
9.6V Linear Regulator
5V Switching Regulator
3.3V Step-Down Regulator
9.6V Regulator
15V Regulator
3.3V Regulator
5V Regulator

38. Schematic Design 15V Linear Voltage Regulator Incorporates a fuse
Overload protection circuitry
Battery trickle charger

39. Schematic Design 9.6V Linear Voltage Regulator 15V input
Overload protection circuitry

40. Schematic Design 5V Switching Voltage Regulator
High current output (1.5 A)
Resistant to input voltage variation

41. Schematic Design 3.3V Power Supply Regulator 15V input voltage
Overload protection circuitry

42. Schematic Design Microcontroller 112 pin package
Controls all peripherals
64K Flash available

43. Schematic Design Ethernet Controller
Module contains all necessary magnetics

44. Schematic Design RF-ID Reader Tunable antenna Signal receive interrupt
1ms delay before half-duplex RS232 transmission
Operating range of ~6 inches

45. Schematic Design LCD 4x20 character display
Separate LED backlight turn-on
Half-duplex RS232 communication

46. Schematic Design Keypad Circuitry Versatile 16 key keypad
4-bit decoder to reduce I/O pin usage
Data-Available interrupt

47. Schematic Design

48. PCB Layout Design Design Considerations
Similar circuits in close proximity
Increased power and ground trace size
Decoupling capacitors
Minimal interference Ethernet path
Accessible connections

49. PCB Layout Design

50. PCB Layout Design
TIP110 Circuitry
Optoisolators

51. Microcontroller

52. PCB Layout Design Keypad Encoder Rerouted to Port J6
Added capacitor on this trace
Keypad Encoder

53. Software Design Display Sound feedback Interrupt-driven components
Standalone implementation
Polling loop components
Display
Sound feedback
Interrupt-driven components
RFID
Keypad
Timers
Ethernet

54. Software Design Preliminaries
Entirely written to ~43KB of Flash memory
Composed in ANSI C
Code Warrior generated shell

55. Software Design
Polling Loop Block Diagram

56. Software Design Software Modules Webserver
Static and dynamically created web pages
Displays system parameters
Allows remote modification
Open source TCP/IP stack protocol
Incorporates CGI

57. Software Design Display Module Menu level tree structure
Functions located only at bottom of tree
Displays after single response
Few dynamic screens, mostly static menus

58. Software Design Software Modules Access control module
Toggle a port pin to engage the solenoid
Activated on a successful tag ID
Clock & Timer Module
16-bit counter
4 input capture/output compare channels
RTI updates various timers and continuously runs in the background.

59. Software Design Structure and speed of the system.
Each time through polling loop, only one parameter is changed
Ample time for interrupt handling
“Switch” statements
Creates a jump table
Decreases response time

60. Success Criteria Demonstrations
Ability to unlock pet door in response to RFID tag detection or manual override pushbutton. - demo
Ability to configure pet door and monitor its status via an embedded web server. – demo
Ability to provide audio feedback ("beep") in response to RFID tag detection. – demo
Ability to display pet door status locally on an LCD display. – demo
Ability to continue operation in the event of A.C. power failure (battery backup). - demo

61. Individual Contributions
Team Leader – Nate Meier
Team Member 2 – Dan Aardsma
Team Member 3 – Chris Newton
Team Member 4 – Chris James

62. Team Leader – Nate Meier
Ordering Parts
Constraint Analysis Professional Paper
Schematic Design Paper
PCB redesign
Packaging Construction
Software
Interrupts and Timers

63. Member 2 – Dan Aardsma Ordering Parts Software Design Paper
Patents Liability Professional Paper
PCB Redesign
Packaging Construction
Software
Web & CGI
Display/Navigation

64. Member 3 – Chris Newton Schematic Design PCB Design Paper
Ethical/Environmental Professional Paper
PCB Design and Redesign
Packaging
Populated PCB
User manual (Troubleshooting, Use Instructions)

65. Member 4 – Chris James PCB Redesign Packaging Design Paper
Safety and Reliability Professional Paper
Populated PCB
Packaging Construction
User Manual (Introduction, Setup Instructions)

66. Project Summary Important lessons learned
Do things right the first time
PCB & schematic design
There is no wrong answer in design
Work ahead
Stay on good terms with your group
You start as a group and must finish as a group

67. Project Summary Second iteration enhancements
Use plastic enclosure instead of wood
Lighter and more appealing
Use a smaller PCB board size
More compact packaging
Use small motors instead of solenoids
More efficient
Research smaller batteries
Lighter and more accessible

68. Questions / Discussion