Download - 3D R G B LED Cube
1
3D RGB LED Cube
Group 15 Luke Ausley BSEE
Joshua Moyerman BSPE Andrew Smith BSPE
Sponsored by Stellascapes
2
Motivations and Goals
• Desire to discover innovative methods for improving LED cube design
• Project aligned with individual group member’s expertise and interest
• Diverse design aspects
3
SpecificationsTitle QTY Units
Cube Resolution 10 x 10 x 10 Voxels
LED Lattice Dimensions 50 x 50 x 50 cm
Outer Dimensions 60 x 60 x 70 cm
Pitch 5 cm
Refresh Rate 100 hz
Animation Rate 25 fps
Color Space 24 bit
Operating Voltage 120 V
Operating Current 1 A
7
Key Hardware Design Decisions• Multiplexing• Control Hardware Structure
o Joint FPGA/MCU
• LED Driver Board o TI LED Driverso MOSFETs
• PCB Layouto Three separate two-layer PCBs
8
Driver Design
• Two identical driver boards will be used to reduce power dissipation and circuit board size and isolate faults.
• TLC5948A LED Drivers• SI4101DY-T1-GE3 P Channel Mosfet• Individually fused planes
11
Control Design
• FPGA and MCU based control system• FPGA to handle interfacing to driver circuitry
due to timing constraints• MCU to handle user interfacing via ethernet• FPGA and MCU will work together to
complete the task of driving LEDs
12
FPGA and MCU Choice• PIC24HJ265GP206A Microcontroller
o Low cost, 16 bit architectureo Stellascapes existing experience with Microchip line of
productso Readily available ethernet interface with TCP/IP Stack
• Xilinx XC3S200AVQ100 Spartan 3A FPGAo Team’s familiarity with Xilinx ISE from Digital Systems Lab
worko Stellascapes interest in integrating FPGA with PIC24
16
Firmware - MCU
• Developed using C (6000 lines of code)• Microchip MPLAB X IDE• Microchip XC C Compiler• Microchip’s freely available TCP/IP Stack
17
Firmware - FPGA
• Written in Verilog (1600 lines of code)• Xilinx ISE 14.5 Development Environment• Simulated using ISim
18
Firmware Update Cycle
• Updated FPGA code to be loaded via MCU Ethernet connection
• FPGA bitstream stored on 8Mb EEPROM• MCU to control loading of FPGA Device
19
Power SupplyAblecom SP502-2S
Output Voltage 5 V
Max Current 30 A
Input Voltage 100-240 V
Input Frequency 50-60 Hz
Max Input Current 10 A
Dimensions 7x4x2 in
27
LED Animation GUI• 12 distinct animations• 3 distinct color modes
• User Input• HSV Scroll• Random
• 24-bit color palette• Brightness scaling
Communication• E1.31 Streaming
Architecture for Control Networks (sACN)
• Up to 512 color channels/packet
• Animation data sent over 6 packets
28
30
Hardware Simulator
Scrolling TextUser Input Color
Sine RippleRandom Color
Rotating Sine HSV Scroll Color
32
BudgetItem Qty Total Cost
LEDs 1200 $350 - Sponsored
Construction Materials N/A $100
PCBs 3 $200 - Sponsored
LED Drivers/MOSFETs 20 ea $75
Power Supply 1 Group Owned
Wire 1200ft $100
Assorted Components N/A $100
Estimated Overall Total $925
Estimated Amount Spent (Non-sponsored) $375
34
Successes
• All components operational in standalone• Mature black-box software• Timing specs met• Proof of concept with moderate confidence• Functional prototype