![]() ![]() Light_value = value_RED*((float)value/(float)gradation) ĪnalogWrite(ledpin1, y) // increase the voltage in pin 9 from random to 0 voltsĪnalogWrite(ledpin2, x) // increase the voltage in pin 10 from random to 0 voltsĪnalogWrite(ledpin3, w) // increase the voltage in pin 11 from random to 0 voltsĭelay(30) // waits for 30 milli seconds to see the dimming effectĭelay(700) // wait. In this project, I will use a Common Cathode type RGB LED. Generally, the common cathode variant is found more frequently than the common anode variant. 2 Answers Sorted by: 2 As long as each LED in the array uses 20mA or less you can do it directly with the Arduino: simulate this circuit Schematic created using CircuitLab Note that the blue LED will have a higher forward voltage than the red and green ones, hence the lower resistor. Pin configuration, Anode and cathode Electronic symbol. Light_value = value_BLUE*((float)value/(float)gradation) The through-hole variant of an RGB LED has 4 leads: one lead for each individual color (Red, Green and Blue) and the fourth one is the common lead (which can be either a cathode or anode). TAKE A LOOK AT THIS:100pcs 5mm RGB LED Common Cathode / Common Anode Tri-Color Emitting Diodes f5 RGB Diffused / Transparent Highlight for arduino PRODUCT. A light-emitting diode (LED) is a semiconductor device that emits light when current flows. Light_value = value_GREEN*((float)value/(float)gradation) Value_GREEN = 200 + random(56) // puts a random number between 0 and 255 into value_GREENįor(value = 200 value =200 value-=5) // ramp the number in "value" from 255 to 0 Value_BLUE = 200 + random(56) // puts a random number between 0 and 255 into value_BLUE Value_RED = 200 + random(56) // puts a random number between 0 and 255 into value_RED Int ledpin3 = 11 // green LED connected to pwm pin 11 via 1K ohm resistor Int ledpin2 = 10 // blue LED connected to pwm pin 10 via 1K ohm resistor Int ledpin1 = 9 // red LED connected to pwm pin 9 via 1K ohm resistor random tri-color fading LED *common cathode* RGB LED (common anode) A common anode RGB LED is nothing more complicated than three one colour LEDs (one red, one green, and one blue) housed in a single package. Does anyone have any ideas of where I can begin to get this RGB LED to work? Hints and ideas are appreciated at this point since I've been banging my head on a well for a couple of weeks. Step 1: Parts Only a few parts are required. I have some code that I found online (Update: Original post can be found at the old forum, it was written by Studio Bricolage) however I can't figure out how to transform the code to work with a Common-Anode RGB LED using pull down resistors. ![]()
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