Transcript 16.7 Million Color LED Light Fixture
16.7 Million Color Light Fixture
L E D
Jeffrey Knorr Christopher Yope
Project Definition
Using very high output light emitting diodes (LED) and the United States Institute for Theatre Technology DMX512 control protocol, a 16.7 million color LED light fixture will be created and interfaced with a NSI MC6300 lighting controller.
Ambient Temperature Sensor 5 Pin XLR Connector
Block Diagram
RS485 Receiver Opto-Isolator PIC (Microcontroller) Addressing (Dip Switches) Switching Power Supply Red Dimmer Green Dimmer Blue Dimmer Red LED Array Red Temperature Sensor Green LED Array Green Temperature Sensor Blue LED Array Blue Temperature Sensor
User Interface
R G B
Analytical Component
Capture LED Array & Ambient Temperature Within Operating Range?
NO YES Apply Desired Output Brightness Value Scale desired output brightness value to maintain or reduce array temperature
DMX512 Protocol
Bit Position
1
Description
Start Bit – Logic Low 2-9 10-11
DMX-512 Data Frame Format
Data bits – Starting with LSB Stop Bits – Logic High
DMX-512 Data Frame Format (two stop bits)
Determine Starting DMX512 address from DIP Switches and set max channel Watch for falling edge transition, then scan for Break signal - Two frames of ‘00’ Was Break found?
YES Scan for Mark After Break NO Was MAB found?
NO YES Scan for Null Start Code - Signals DMX512 Data follows Was NULL found?
YES Read Dimmer Data from DMX512 bus and increment channel counter NO NO Channel counter >= max channel?
YES
Task Responsibility
Jeff
PIC Research/Selection LED Research/Selection
Shared
PIC Programming Testing Webpage Project Construction DMX512 Protocol Analysis
Chris
Temperature Sensor Research/Selection LED Dimming Circuitry
Sensor Selection
Microchip TC1047A Vin between 2.5V and 5.5V
10mV per °C Voltage Slope Output ±0.5 °C Accuracy Low Running Current – Minimizes Self Heating and More Accurate Result Small Size for Better Placement
Sensor Use
Total of 4 Sensors One for each color –Red, Green, Blue One for Ambient Temperature Needed to ensure that the LED’s do not overheat
LED Selection
LumiLEDs Luxeon Star and Star V LEDs State of the art LEDs LEDs require heatsinking to prevent overheating and to help maintain a low pn junction temperature
Color Red Green Blue Wavelength
625 nm 530 nm 455 nm
Luxeon Product
Star Star Star V
Luxeon Part Number
LXHL-MD1D LXHL-MM1D LXHL-LR5C
Lumen Output (Each LED)
27 30 30
Forward Bias Voltage (VDC)
3.42
2.95
6.84
Average Forward Current (mA)
350 350 700
Max Junction Temp. ( ° C)
120 120 135
Microcontroller Selection
PICs are widely used in industry due to their low cost and relatively simple instruction set 18F458 features: Programmable Serial Interface, 4 PWM outputs, 10bit ADC, large internal memory (32kb Flash, 1.5kb RAM) Dual Inline Package Low Cost Simple System Integration
Work Completed
Microcontroller Acquired LED’s Acquired Temperature Sensor Acquired LED Testing Initial Dimming Circuit Design Power Supplies Acquired Initial Webpage Design
Worked to be Completed
Sensor Testing PIC Programming Finalize Dimming Circuit Website Construction Project Testing Report Demonstration
Test Plan
Test each subsystem individually Gradually combine subsystems and perform intermediate system tests Initial full system tests System Burn In (& temperature testing) Final thorough system testing
Power Consumption
Device
Red LEDs Green LEDs Blue LEDs PIC Microcontroller Resistive/Switching Losses Sensors Cooling Fans
TOTAL Approximate Power Consumption (watts)
4 4 20 1.5
25 0.5
8 63
System Cost
Item
Blue LED Red LED Green LED Power Supply PIC Dip Switches Dimmer Circuitry Connectors Enclosures Temperature Sensors Heatsinks Cooling Fans Opto-Isolator/RS485
TOTAL Price
24 8 8 6 20 1 10 20 10 1 2 4 1
Quantity
4 4 4 2 1 1 1 1 2 4 12 4 1
Total
96 32 32 12 20 1 10 20 20 4 24 16 1 288
Questions?
Comments?
Suggestions?