The RGB Cube uses "common cathode" LEDs instead. Note: These are not the same as the LEDs used in the RGB Cube kit. Using PWM pins on your Arduino you can then blend the red, green and blue colours together to create any colour you like. My breadboard is as shown: simulate this circuit Schematic created using CircuitLab. My previous experience is using a common cathode. Step 1: Components Required 3 More Images (1.) ARDUINO UNO (Or any Arduino UNO Clone) (2.) Common Anode RGB LED (3.) 3X220 Ohm Resistor (4.) 3X Diode (5.) Breadboardper Cables (6.) Jumper Cables Ask Question Step 2: The Circuit Connect the Common Anode of the RGB LED to Digital Pin - 8 on the Arduino UNO. RGB LED Common Anode 4 Pin (5mm) 2.0-2.2V(Red) / 2.2-2.6V(Green) / 3.2-3.4(Blue). There are better ways to control multiple RGB LEDs off an Arduino. Please note that this Instructable is educational, not practical. Intro to Arduino Output L6: RGB LEDs Lesson 6: RGB LEDs Table of Contents Materials Common Anode vs. The "anode" is the positive side of the LED, so having a common anode means you can connect the anode pin to the positive power rail and then switch on the individual RGB elements by connecting their pins to 0V (GND) using current limiting resistors. I am using PWM (analogWrite) with a common anode LED. 6 or 16 RGB LEDs, either common anode or common cathode - 3 or 8 MOSFETs, P-Channel or N-Channel respectfully - 1 demux chip, either 74HC138 or 74HC238 - 6 220 Ohm resistors Also, grab the sketches from GitHub. This is an LED in which all the grounds of the LEDs are tied together common. Great for building colourful displays or status indicators that change colour! Comes in a handy packs of either 8 or 100. The type of RGB LED we will use in this circuit is the more common cathode RGB LED. Huge 8mm RGB (Red Green Blue) LEDs in a 4-pin package with a common anode connection.
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