Scalable-RGB-LED-Matrix
Description
Watch A 4X6 - Matrix On Youtube: Http://Www.Youtube.Com/Watch?V=Denzghn-Fe8 This Thing Is A Led-Matrix ... The Cubes Are 8Cm X 8Cm X 3Cm .. The Chip For Controlling The Led'S Is A Ws2803 (Get Them At Ebay) .. A Ws2803 Is A Constant-Current-Led-Driver With 18 Channels .. Meaning With 1 Chip You Can Control 18 Leds Or 6 Rgb Leds. Please Note A Rgb-Led Is Having Different Voltages Per Color ... But The Same Current ;-) .. So A Constant Current Driver Will Ensure The Voltages Are Automatically Set By The Chip .. You Dont Have To Care About That. Okay .. This Tiny Chips Are Spi-Controller ... So They Have A Input-Clock-Pin And Input-Data -Pin ... And Best Of All ;-) Clock-Out-Pin And Data-Out-Pin .. So You Can Chain This Chip With 2 Wires :-) E.G. For The 15 X 6 Rgb-Led-Matrix I'Am Building .. A Build 6 Cube-Columns ... Every Column Is Powered By One Ws2803 Chip Which Is Connected To The Next Column .. Its Quite Easy To Build A Giant Led-Matrix With This Driver .. Please Notice .. A Led Is Max. Requiring 20Ma So In My Scenario I'Am Using 15*6 Leds => 90 Leds Each Led Will Require Current ;-) So You Need A Pretty Strong Power-Source (5V @ 6A) For Controlling The Ws2803 I'Am Using A Simple Arduino Uno (You Can Use Any Other Microcontroller You Like .. Picunio .. Stm32...) At The Bottom Of Every Column I Am Mounting A "Electronics Cube" For The Ws2803 Circuit .. The Cubes Are Having Wiring Holes ... One Led-Mount (You Need Cooling To Get The Correct Diameter) And A Option To Use Cable Ties .... I Used A Glue Gun. *** For The Ws2803 You Ned Rgb-Leds With Same Anode (+) *** *** The Ws2803 Is A Pwm-Driver So You Can Dim Every Led With 8 Bit (0..255) *** *** The Photos Are Showing The Back-Side Of The Cubes ;-) *** Power-Source Notes: Led[R?] 2,2V * 20Ma => 0,044 Watt Per Channel Led[G?] 3,3V * 20Ma => 0,066 Watt Per Channel Led[B?] 3,4V * 20Ma => 0,068 Watt Per Channel Led => 0,79 Watt Per Led E.G. 6X6 Matrix => 36 Rgb-Leds (108 Channels) 36 Rgb-Leds * 0,79W => 28,44 Watt + Ics + Microcontroller + Doubled-Security .. Lets Say A 60 Watt Power-Source Should Be Fine In This Case .. However .. Do Our Own Calculations ;-) ..
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