Created
April 4, 2014 00:30
-
-
Save SamClayton/9965643 to your computer and use it in GitHub Desktop.
Color wash fades with RGB LEDs straight off Arduino analog ports
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| /* | |
| * RGB_LEDs sketch | |
| * RGB LEDs driven from analog output ports | |
| */ | |
| const int redPin = 3; // choose the pin for each of the LEDs | |
| const int greenPin = 5; | |
| const int bluePin = 6; | |
| const int redPin2 = 11; // choose the pin for each of the LEDs | |
| const int greenPin2 = 9; | |
| const int bluePin2 = 10; | |
| const boolean invert = true; // set true if common anode, false if common cathode | |
| int color = 0; // a value from 0 to 255 representing the hue | |
| int R, G, B; // the Red Green and Blue color components | |
| int brightness = 255; // 255 is maximum brightness | |
| boolean increaseBright = false; | |
| int brightIncrement = 0; // also used 20 | |
| int delaySpeed = 5; // also used 250 | |
| void setup() | |
| { | |
| // pins driven by analogWrite do not need to be declared as outputs | |
| } | |
| void loop() | |
| { | |
| /* | |
| if(color % 24 == 0) | |
| brightness = random(128, 255); | |
| */ | |
| /* | |
| brightness += 20; | |
| if (brightness > 255) | |
| brightness = 50; | |
| */ | |
| if (brightness > (255 - brightIncrement)) | |
| increaseBright = false; | |
| if (brightness < brightIncrement) | |
| increaseBright = true; | |
| if(increaseBright) | |
| brightness += brightIncrement; | |
| else | |
| brightness -= brightIncrement; | |
| hueToRGB(color, brightness); // call function to convert hue to RGB | |
| // write the RGB values to the pins | |
| analogWrite(redPin, R); | |
| analogWrite(greenPin, G); | |
| analogWrite(bluePin, B ); | |
| hueToRGB(255 - color, brightness); | |
| // write the RGB values to the second set of pins for the second LED | |
| analogWrite(redPin2, R); | |
| analogWrite(greenPin2, G); | |
| analogWrite(bluePin2, B); | |
| color++; // increment the color | |
| if(color > 255) | |
| color = 0; | |
| delay(delaySpeed); | |
| } | |
| // function to convert a color to its Red, Green, and Blue components. | |
| void hueToRGB( int hue, int brightness) | |
| { | |
| unsigned int scaledHue = (hue * 6); | |
| unsigned int segment = scaledHue / 256; // segment 0 to 5 around the | |
| // color wheel | |
| unsigned int segmentOffset = | |
| scaledHue - (segment * 256); // position within the segment | |
| unsigned int complement = 0; | |
| unsigned int prev = (brightness * ( 255 - segmentOffset)) / 256; | |
| unsigned int next = (brightness * segmentOffset) / 256; | |
| if(invert) | |
| { | |
| brightness = 255-brightness; | |
| complement = 255; | |
| prev = 255-prev; | |
| next = 255-next; | |
| } | |
| switch(segment ) { | |
| case 0: // red | |
| R = brightness; | |
| G = next; | |
| B = complement; | |
| break; | |
| case 1: // yellow | |
| R = prev; | |
| G = brightness; | |
| B = complement; | |
| break; | |
| case 2: // green | |
| R = complement; | |
| G = brightness; | |
| B = next; | |
| break; | |
| case 3: // cyan | |
| R = complement; | |
| G = prev; | |
| B = brightness; | |
| break; | |
| case 4: // blue | |
| R = next; | |
| G = complement; | |
| B = brightness; | |
| break; | |
| case 5: // magenta | |
| default: | |
| R = brightness; | |
| G = complement; | |
| B = prev; | |
| break; | |
| } | |
| } | |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment