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Josh O’Harajmohara@calpoly.edu

Electrical Engineering DepartmentCalifornia Polytechnic State University San Luis Obispo

8x8 RGB LED Matrix Controller PCB

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Concept / Goal

Create an RGB LED Matrix controller

8x8 RGB LED Matrix Visualizer / Mood lighting Portable / Low-power Reprogrammable Easy to make animations

Expandable

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Existing Designs

SparkFun’s Serial Interface Surface-mount SPI interface Daisy-chain Cannot use by itself

Operation 3x 8-bit shift registers for each color value (RGB) Darlington pair amplifier to drive the common

cathode LED matrix SPI in / out (frame data)

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Functional Block Diagram

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Schematic

Component / footprint libraries were created Each component was measured

Modified MCU Instead of ATtiny, used the ATmega328p On-board programming header (ISP 3x2)

Modified power L7805 5V Regulator Filtering capacitors Alternative power inputs (7-15V, or 5V direct)

Function Buttons Activity / Status LEDs

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PCB Layout

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Completed Boards

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Completed Boards

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Completed Boards

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Thank you for your time!

Questions?