Nolan Clark.  Each RGB led color connects to a different 16- channel driver (total of 3 primary drivers)  3 16-channel drivers daisy chained together.

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Presentation transcript:

Nolan Clark

 Each RGB led color connects to a different 16- channel driver (total of 3 primary drivers)  3 16-channel drivers daisy chained together to communicate over SPI via an ATMEGA644A  RGB LEDs source 20mA 3.2V  Control driver current with current limit resistor on driver IC 3kohm for 20mA

 Complete design in Cadence ALLEGRO  10-20mil traces with 10 mil spacing  15mil via  15 mil annular ring for via  Board dimensions 4000x6000mil

Solder Mask Top Bottom Top Solder Mask Bottom

 Cadence Allegro very versatile program for schematic and PCB design  Originally designed 4-layer board, too expensive to manufacture  Redesign to 2-layer challenging because Allegro makes it difficult to undo major changes (such as deleting extra layers)  Will use Allegro for future PCB design  Circuit does work, only requires an AVR programmer to program the microcontroller