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PIC Evaluation/Development Board
Dec02-12December 10, 2002Client: ECpE Department Faculty Advisors: Dr. Rover, Dr. Weber Chad Berg, Luke Bishop, Tyson Stichka, Nick Veys
Presentation Outline Problem Statement Design Objectives End-Product Description Assumptions/Limitations Project Risks/Concerns Technical Approach Evaluation of Project Success Recommendations for Future Work Human/Financial Budgets Lessons Learned Closing Summary
Problem Statement
Many project implementations require the use of a microcontroller
However, the development of a Peripheral Interface Controller (PIC) solution is often beyond the expertise and available time of the design team
Design Objectives
Design and implement a board to enable future senior design teams to quickly and easily use a PIC solution in their projectsFlexibleEasy to UseCost EfficientSoftware Libraries
End-Product Description
Microchip 16F876 Based SolutionCAN InterfaceCharacter LCD Display7 Segment DisplaysSerial (RS232) InterfaceTemperature SensorSpeaker
Software Libraries for All Components
Assumptions/Limitations
Assumptions: Users have an electrical/computer engineering
background Users have access to a personal computer with a free
parallel port Users have C programming skills
Limitations: Budget of $100 Size Constraints Environmental Constraints
Project Risks/Concerns
Design ErrorOver 100 traces and 200 pinsSoftware depends on working hardware
Device FailureSocket interfaces were used for crucial
components Loss of a Team Member
Technical Approach
The requirements for this project were relatively open-ended
The 16F876 was chosen for versatility CAN interface provides interoperability
with industrial/automotive equipment Other devices were chosen for their uses
in practical applications
Technical Approach
C was chosen for rapid development The following libraries were implemented
Character LCD RS232 Seven segment displays CAN
Initialization and diagnostic routine was also created
Technical Approach
Programmer P16Pro compatible hardware Parallel port interface Cheap, reliable Lots of software support
Technical Approach
Eagle was used for schematic and PCBWidely used, supportedSimple, powerful interfaceLinux/Windows supportProvides schematic capture and PCB layout
Technical Approach
Schematic Capture using custom-made parts Form logical connections for use in PCB layout
Technical Approach
Technical Approach
Project Success
Milestone Percent Completed
Project Definition 100
Subsystems Designed 100
Board Layout Completed & Simulated 100
Peripheral Subsystems Prototyped and Tested 100
Prototype Board Assembled 100
Programming Environment Developed 100
Supported PIC Tested Successfully 100
C Libraries Developed 100
Full Documentation Written & User Tested 100
Sample Code for Every Module Written 100
Final Board Operational 100
Project Total 100
Further Work
Use the design provided to create even better senior design projects
Additional pins available on the PIC for future expansion
Design is flexible enough to be customized for a particular project
Human Budget
Team Member Original Estimated Effort Revised Estimated Effort
Actual Final Effort
Chad Berg 65 Hours 129 Hours 105 Hours
Luke Bishop 60 Hours 140 Hours 107 Hours
Tyson Stichka 62 Hours 126 Hours 98 Hours
Nicholas Veys 70 Hours 134 Hours 119 Hours
Totals 257 Hours 529 Hours 429 Hours
Financial Budget
Item Original Estimated Cost
Revised Estimated Cost
Actual Final Cost
Electronic Components $30 $30 $20.44
Character LCD Display $30 $30 $0
Dual-Layer PCB $70 $70 $34
Power Supply $6 $6 $9.95
PIC Microcontroller $20 $20 $8.19
Poster $15 $80 $80
P16PRO40 Programmer $0 $20 $18.95
Hi-Tech C Compiler $0 $1000 $0
Total $171 $1256 $171.53
Lessons Learned
Being a team doesn’t mean doing everything together!
Tasks must be divided between team members to finish on time
Each member must take responsibility for delivering
Communication
Summary
A flexible PIC development solution is important for future senior design students
This design costs half of comparable commercial products
The software libraries provide significant additional value
Q&A
