S15: CAN controlled RGB LED cubes
Contents
Grading Criteria
- How well is Software & Hardware Design described?
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- Code Quality
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- Software Block Diagrams
- Hardware Block Diagrams
- Schematic Quality
- Quality of technical challenges and solutions adopted.
Project Title
CAN controlled RGB LED cubes
Abstract
In this project, data(1 byte) sent from an android application will be displayed in a 3D form on a LED cube. Two LED cubes will be connected to two different SJone boards, these SJone boards are connected to a third SJone board using CAN bus. The LED cubes will be connected to their respective SJ boards through shift registers. The boards will implement SSP protocol to communicate with the shift registers. A bluetooth module is connected to third SJone board. Android application sends data to be displayed along with the information about the SJone board(one of the LED cube) to be selected.
Objectives & Introduction
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Team Members & Responsibilities
- Chitrang Talaviya
- LED cube design
- Implementing CAN protocol
- Bluetooth module interfacing
- Navjot Singh
- Implementing CAN protocol
- Bluetooth module interfacing
- FreeRTOS environment
- Anuj Korat
- LED cube design
- Generating patterns
- Implementing SSP with the shift registers
- Daamanmeet Paul
- Android application development
Schedule
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| Week# | Start Date | Task | Status | Completion Date |
|---|---|---|---|---|
| 1 | 3/15 | Finalizing & ordering components
-Going through the requirements of the project -Order hardware components based on the final list |
Completed | 3/17 |
| 2 | 3/27 | 3x3x2 LED cube testing with SPI interfacing
-Studying the SC74HC595 shift register datasheet -Constructing a 3x3x2 LED cube for testing purpose -Interfacing of shift register using SSP1 with LPC1758 -Cascading of 4 shift registers using SSP1 to control anodes & RGB cathodes |
Completed | 4/10 |
| 3 | 4/8 | Bluetooth Interface with SJone board through Android APK
-Testing the AT commands of Bluetooth RKI-1545 module using hyperterminal(Completed) -Testing interfacing of bluetooth using UART2(In progress) |
In progress | 4/17 |
| 4 | 4/8 | Android application | In progress | 4/25 |
| 5 | 4/16 | 4x4x4 LED cube construction
-Building 2 LED cubes -Interfacing of LED cubes with shift registers -Interfacing & cascading of the shift registers with SJone boards |
In progress | 4/26 |
| 6 | 4/20 | CAN protocol programming | Not Started | 4/30 |
| 7 | 4/27 | Generating patterns on LED cubes | Not Started | 5/7 |
| 8 | 5/1 | Implementing FreeRTOS for the system | Not Started | 5/10 |
| 9 | 5/10 | Final Debugging & testing | Not Started | 5/15 |
Parts List & Cost
| # | Components | Quantity | Price($)/component |
|---|---|---|---|
| 1 | RGB LEDs pack of 100 | 2 | 9.95 |
| 2 | CAN transceivers | 15 | Free |
| 3 | Shift registers, SC74HC595 | 10 | 1.49 |
| 4 | SJone boards | 3 | 80 |
| 5 | Bluetooth module | 1 | 20 |
| 6 | Steel wire | 1 | 8 |
| 7 | Soldering kit | 1 | ~40 |
| 8 | Jumper wires(each type) | 1 | 25 |
| 9 | ULN 2003 | 4 | 12 |
Design & Implementation
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Hardware Design
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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.
Shift registers have been used to communicate betwen the SJone board and the LED cubes. As the dimension of the cue is 4 x 4 x 4, it needs a total of 28 pins to control
it, 16 pins to control 16 groups of 4 LED anodes and 12 pins to control 4 planes of the RGB lines. As we do not have that many pins on SJone board, we will be using 4 Serial-
input-parallel-output shift registers to drive the LED terminals. This eases our job as only 4 pins are used from the board to drive 28 LED terminals.
The communication bus used between the LPC1758 board and the shift registers is SSP-Synchronous Serial Port. The driver written for the communication is as shown in Fig. All the shift registers are cascaded, meaning the serial output of one, connected to the serial input of the other. This way a total of 32 bits of serial data from the board can be converted into parallel outouts which are given to its respective LED terminals.
Software Design
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Implementation
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Testing & Technical Challenges
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My Issue #1
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Conclusion
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Project Video
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Project Source Code
References
Acknowledgement
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References Used
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Appendix
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