Arduino Code | RGB LED Strips - Adafruit Learning System

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180 Beginner Project guide

Arduino Code

Once you have the strip wired up, it is easy to control the color of the strip by using PWM output, for Arduino you can use analogWrite() on pins 3, 5, 6, 9, 10 or 11 (for classic Arduinos using the Atmega328 or 168). An analogWrite(pin, 0) will turn that LED off, analogWrite(pin, 127) will turn it on half-way and analogWrite(pin, 255) will turn it on full blast. Here is some example code that performs a simple color-swirl.If you want to use other pins, check out this page on analogWrite() to know which models support analogWrite() on which pins Download File Copy Code // color swirl! connect an RGB LED to the PWM pins as indicated // in the #defines // public domain, enjoy! #define REDPIN 5 #define GREENPIN 6 #define BLUEPIN 3 #define FADESPEED 5 // make this higher to slow down void setup() { pinMode(REDPIN, OUTPUT); pinMode(GREENPIN, OUTPUT); pinMode(BLUEPIN, OUTPUT); } void loop() { int r, g, b; // fade from blue to violet for (r = 0; r < 256; r++) { analogWrite(REDPIN, r); delay(FADESPEED); } // fade from violet to red for (b = 255; b > 0; b--) { analogWrite(BLUEPIN, b); delay(FADESPEED); } // fade from red to yellow for (g = 0; g < 256; g++) { analogWrite(GREENPIN, g); delay(FADESPEED); } // fade from yellow to green for (r = 255; r > 0; r--) { analogWrite(REDPIN, r); delay(FADESPEED); } // fade from green to teal for (b = 0; b < 256; b++) { analogWrite(BLUEPIN, b); delay(FADESPEED); } // fade from teal to blue for (g = 255; g > 0; g--) { analogWrite(GREENPIN, g); delay(FADESPEED); } } // color swirl! connect an RGB LED to the PWM pins as indicated // in the #defines // public domain, enjoy! #define REDPIN 5 #define GREENPIN 6 #define BLUEPIN 3 #define FADESPEED 5 // make this higher to slow down void setup() { pinMode(REDPIN, OUTPUT); pinMode(GREENPIN, OUTPUT); pinMode(BLUEPIN, OUTPUT); } void loop() { int r, g, b; // fade from blue to violet for (r = 0; r < 256; r++) { analogWrite(REDPIN, r); delay(FADESPEED); } // fade from violet to red for (b = 255; b > 0; b--) { analogWrite(BLUEPIN, b); delay(FADESPEED); } // fade from red to yellow for (g = 0; g < 256; g++) { analogWrite(GREENPIN, g); delay(FADESPEED); } // fade from yellow to green for (r = 255; r > 0; r--) { analogWrite(REDPIN, r); delay(FADESPEED); } // fade from green to teal for (b = 0; b < 256; b++) { analogWrite(BLUEPIN, b); delay(FADESPEED); } // fade from teal to blue for (g = 255; g > 0; g--) { analogWrite(GREENPIN, g); delay(FADESPEED); } }

Page last edited November 26, 2012

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