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--- tutorials:products:rgbledpixel:index.html [2012/01/25 18:55]
ladyada [LED full color (RGB) Pixels!]
+++ tutorials:products:rgbledpixel:index.html [2012/01/25 19:04]
ladyada [Powering]
@@ Line 58: / Line 58: @@
+==== 36mm Square Pixels ====
+{{ :tutorials:products:rgbledpixel:id683_lrg.jpg?500 |}}
+The 36mm square pixels are the biggest and brightest. They have 4 LEDs total and come in a flat metal square 'plate' that is flooded with epoxy. They require 12VDC power and can draw up to 120mA per pixel (there are two sets of two RGB LEDs connected in parallel for two 60mA draw from 12VDC).
 ==== Pixel spacing  ====
@@ Line 138: / Line 143: @@
-==== Powering  ====
+==== Powering 12mm/20mm pixels  ====
@@ Line 145: / Line 150: @@
-Each RGB LED pixel can draw up to 60mA from a 5V supply. That means a strand of 20 can use up to 1.2 Amps, a strand of 25 can use up to 1.5A. Of course this is assuming all the LEDs are on. If you keep most of the LEDs off (by color swirling or patterns) the power usage can be a 1/3 or less.
+Each single RGB LED pixel (such as the 12mm or 20mm LED rubber pixels) can draw up to 60mA from a 5V supply. That means a strand of 20 can use up to 1.2 Amps, a strand of 25 can use up to 1.5A. Of course this is assuming all the LEDs are on. If you keep most of the LEDs off (by color swirling or patterns) the power usage can be a 1/3 or less.
@@ Line 155: / Line 160: @@
 As shown below, connect ground to both your supply and logic microcontroller. Then connect the 5V pin to the power supply. A large capacitor (1000uF or so) is a nice addition to keep ripple down.
+==== Powering 36mm pixels  ====
+The 36mm square pixels are beefier than the 12mm/20mm ones and can draw up to 120mA from a 12V supply. That means a strand of 20 can use up to **2.4** Amps. Of course this is assuming all the LEDs are on. If you keep most of the LEDs off (by color swirling or patterns) the power usage can be a 1/3 or less.
+We suggest a nice switching supply for driving LED dots,[[https://www.adafruit.com/products/352| such as this 12V 5Amp switching supply ]] for a strand or two, or [[http://www.instructables.com/pages/search/search.jsp?ie=ISO-8859-1&q=ATX|a slightly modified ATX power supply (you'll need to connect the green power line to ground but you do not need the 'loading' resistor]]) which can provide 10 Amps or more depending on the make.
+Since the 36mm pixels are powered by 12V but use 3-5V signalling, you'll want to make sure you don't accidentally connect the 12V to your microcontroller! For that reason, the power lines are separated out. Use something like a [[https://www.adafruit.com/products/368|2.1mm DC terminal block adapter]] so that you can plug a 12VDC adapter directly in.
+{{ :tutorials:products:rgbledpixel:36mmpixelterminal.jpg?500 |}}
+The wires on the 3-JST SM connector are then connected to your microcontroller: black is ground, yellow is data and green is clock.
 ==== Wiring  ====

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