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Capstone Fall 2009 LED CUBE

Capstone Fall 2009 LED CUBE. Team 8: Nate Gimple Steven Tighe Amit Halevi Noah Husek. Project Overview. Artistic 3 -D light sculpture 8 x 8 x 8 LED matrix Environmental inputs Interactive Proof of concept. Functional Overview . Run various light patterns Take external inputs

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Capstone Fall 2009 LED CUBE

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  1. Capstone Fall 2009LED CUBE Team 8: Nate Gimple Steven Tighe Amit Halevi Noah Husek

  2. Project Overview • Artistic 3 -D light sculpture • 8 x 8 x 8 LED matrix • Environmental inputs • Interactive • Proof of concept Steven

  3. Functional Overview • Run various light patterns • Take external inputs • Environmental • User • Simple games • Snake • Pong • Game of Life (cellular automata) Steven

  4. Hierarchy / block diagram computer FPGA user input I2C module 0 super node 0 super node 1 super node 7 super node 8 super node 63 … … … node 0 (LED) sensor input node 1 … node 7 Amit

  5. Super-node composition • 8 nodes (1 RGB LED per node) • 4 pin, common anode, diffused epoxy, 10 mm RGB LEDs • One microcontroller • Sensors (each super-node may not be populated) • I2C communication (to FPGA) • UART communication to orthogonal neighbors Amit

  6. Low Level Objectives • Lights up! • Runs preprogrammed patterns/scripts • Modular (nodes, super-nodes, modules, UNIT) • Portable • Make use of available Altera FPGA Nios II soft-core • Individually addressable nodes Noah

  7. Mid Level Objectives • Super-nodes intercommunicate • Super-nodes run scripts autonomously • Simple algorithmic games (e.g. Game of Life) • Senses environmental input • Photocells • Microphones • Full sized device (8 modules, 64 super-nodes, 512 nodes) Noah

  8. High Level Objectives • Additional sensors • Thermistors • Barometers • Geiger counters • User input (e.g. Wiimote, keyboard) • Audience proof • Resilient to damage • Hot swappable • Self boot-loadable • DMX – industrial lighting protocol Noah

  9. Microcontroller • Atmel ATxmega64A1 • 24 PWM channels • Built in ADC and DAC • 4 I2C interfaces • 8 USARTs • Operates at 32 MHz • And many other features Nate

  10. Physical Construction • Physical hierarchy • 512 nodes each consisting of one LED • Each 2 x 2 x 2 node is a super-node • Each 2 x 2 x 2 super-node is a module • Full unit consists of 8 modules • Rigid frame constructed from PCBs • 2’ length per edge is much reduced from original 5’ • 700W computer power supply • Buck converter 12V  5V Nate

  11. Budget Steven

  12. Risks • Constructing the full cube might be ambitious (scaling). We might only attempt one module. • Addressing in a logical and intuitive way • PCBs as structural members • Ordering LEDs from Hong Kong (unknown vendor) • MOSFET switching 5V with a 3.3V gate signal quickly • Learning to use the Nios II soft-core on the FPGA • Cost! Steven

  13. Division of Labor • Amit: addressing scheme, communication protocol • Steven: construction/SMD soldering, PCB layout • Noah: coding (soft-core and super-node) • Nate: power supply • Everyone: code and construction. Amit

  14. Testing/Debugging • Modularity (start with one unit, then expand) • LEDs provide an easy way to confirm results • …Did we mention modularity? Amit

  15. Accomplishments by CDR • Super-node hardware prototype • Demo firmware • 24 channel PWM • Runs simple autonomous patterns/scripts on super-node • All parts selected (sensors, LED drivers) • Know how to program Nios II soft-core Nate

  16. Milestone 1 • “Puppet” mode (FPGA direct control) • More super-nodes (a full module = 8 super-nodes) • Establish intercommunication (maybe) • Power supply (350 W @ 5V) Nate

  17. Milestone 2 • Full cube construction • More complex super-node autonomous scripts • Environmental input • Simple algorithmic games (GOL) • Be ready for expo Nate

  18. Schedule Nate

  19. Other Considerations • Safety: High current, but low voltage  safe. • Sustainability: Every part except μC are available from multiple vendors. No support required short of uploading new code. • Manufacturability: Component tolerances will have little or no impact. Physical construction will be difficult and laborious. Modular approach simplifies testability. Noah

  20. Questions?

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