F13: POV Display
Contents
Grading Criteria
- How well is Software & Hardware Design described?
- How well can this report be used to reproduce this project?
- Code Quality
- Overall Report Quality:
- Software Block Diagrams
- Hardware Block Diagrams
- Schematic Quality
- Quality of technical challenges and solutions adopted.
Web-Enabled POV Display
Abstract
The Persistence of Vision (POV) device will display a message that is input by a remote user via a website setup for this project. The message will be received by the microcontroller using a Wifly RN-XV module integrated onto the LPC17xx board. The microcontroller will interpret the message and drive the LEDs to display the message on the POV device.
Figure 1 shows the overall system diagram:
Objectives & Introduction
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The team will be divided into two groups. Team 1 will be responsible for the user interface and integrating the Wifly module on the SJSU board to communicate with the website. Team 2 will build the POV device and write the driver to display the user message on the POV display. A summary of the team and responsibilities is shown below:
Team Members & Responsibilities
Team 1 (Jorge Del Valle and Matt Heffner)
- Website Development
- Wifly module setup
- Front end communication from website to wifly
Team 2 (Jasko Begovic and Thu Hoang)
- Mechanical POV device
- LED drive software
The project will take 6 weeks to complete. The following table shows weekly project milestones and the team's progress.
| Date Planned | Milestone | Status |
| 22-Oct | Wifly part received; POV parts ordered and shipped | Complete |
| 29-Oct | Integrate Wifly to SJSU board and connect to Wifi connection | Complete |
| 5-Nov | Finish mechanical assembly & any electrical interfaces (Hall effect switch.) Read datasheets, obtain necessary libraries for LED device, understand & modify libraries to work with SJSU board Setup Website for user interface to the device | Website Setup, LED driver started, Mechanical Assembly Built |
| 12-Nov | Implement code to receive data from website via the Wifly module | Debugging website communication |
| 19-Nov | Finish code for LED driver. We are aiming to display the alphabet. Start integration of the Wifly portion with the POV device | |
| 26-Nov | Project testing. Have working Assembled code with Web-half & test by inputing various strings via the website | |
| 3-Dec | Present demonstration and submission of project report |
Parts List & Cost
| Part | Cost |
| Wifly RX-NV module | $35 |
Design & Implementation
The design section can go over your hardware and software design. Organize this section using sub-sections that go over your design and implementation.
The user interface for the project will be http://povdisplay.com. The user will input a message to be displayed on the POV device, as well as, the RGB color to use.
Several preliminary photos and videos can be found at: http://povdisplay.com/project-videos.html
Hardware Design
Discuss your hardware design here. Show detailed schematics, and the interface here.
Hardware Interface
In this section, you can describe how your hardware communicates, such as which BUSes used. You can discuss your driver implementation here, such that the Software Design section is isolated to talk about high level workings rather than inner working of your project.
Software Design
Show your software design. For example, if you are designing an MP3 Player, show the tasks that you are using, and what they are doing at a high level. Do not show the details of the code. For example, do not show exact code, but you may show psuedocode and fragments of code. Keep in mind that you are showing DESIGN of your software, not the inner workings of it.
Implementation
This section includes implementation, but again, not the details, just the high level. For example, you can list the steps it takes to communicate over a sensor, or the steps needed to write a page of memory onto SPI Flash. You can include sub-sections for each of your component implementation.
Testing & Technical Challenges
Describe the challenges of your project. What advise would you give yourself or someone else if your project can be started from scratch again? Make a smooth transition to testing section and described what it took to test your project.
Include sub-sections that list out a problem and solution, such as:
Wifi Connection Issues
Many wifi connection issues were encountered. To solve this problem, a dedicated task was created to re-connect to wifi if the connection was ever lost.
Conclusion
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Project Video
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Project Source Code
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References
Acknowledgement
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References Used
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Appendix
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