- //Jeremy Blum's Arduino Tutorial Series - Episode 14 - Lights and Sound Holiday Special
- //Sample Code 2 - Driving all 50 LEDs using an array powered by both stereo channels
- //WS2801 Library and Helper Functions by Adafruit
- /*
- The circuit:
- * A0 from Amplififed Left Channel
- * A1 from Amplified Right Channel
- * Digital 2 to Light Clock Line
- * Digital 3 to Light Data Line
- * Don't forget to connect all your grounds!
- */
- //SPI Library
- #include "SPI.h"
- //RGB LED Library
- //You can download it here: [url=https://github.com/adafruit/Adafruit-WS2801-Library/archive/master.zip]https://github.com/adafruit/Adaf ... /archive/master.zip[/url]
- //Install it in your library folder and restart the Arduino IDE
- #include "Adafruit_WS2801.h"
- //Analog Input Pins
- int left_channel = 0;
- int right_channel = 1;
- //Light Control Pins
- int light_data = 3;
- int light_clk = 2;
- //Set Strip Constants
- const int length = 50;
- const int half = length/2;
- //Library Setup
- Adafruit_WS2801 strip = Adafruit_WS2801(length, light_data, light_clk);
- //Set up arrays for cycling through all the pixels. I'm assuming you have an even number of lights.
- uint32_t left_array[half];
- uint32_t right_array[half];
- void setup()
- {
- //Fill pixel arrays with zeros
- for(int i=0; i<half;i++)
- {
- left_array[i] = 0;
- right_array[i] = 0;
- }
-
- //Initialize Strip
- strip.begin();
- strip.show();
-
-
- }
- void loop()
- {
- //Set the hue (0-255) and 24-bit color depending on left channel value
- byte hue_left = constrain(map(analogRead(left_channel), 0, 400, 0, 255), 0, 255);
- uint32_t color_left = Wheel(hue_left);
-
- //Set the hue (0-255) and 24-bit color depending on right channel value
- byte hue_right = constrain(map(analogRead(right_channel), 0, 400, 0, 255), 0, 255);
- uint32_t color_right = Wheel(hue_right);
-
- //Shift the current values.
- for (int i = 0; i<half-1; i++)
- {
- left_array[i] = left_array[i+1];
- right_array[i] = right_array[i+1];
- }
-
- //Fill in the new value at the end of each array
- left_array[half-1] = color_left;
- right_array[half-1] = color_right;
-
- //Go through each Pixel on the strip and set its color
- for (int i=0; i<half; i++)
- {
- //set pixel color
- strip.setPixelColor(i, left_array[i]);
- strip.setPixelColor(length-i-1, right_array[i]);
- }
- //Display the new values
- strip.show();
-
- //sample delay
- delay(40);
- }
- /* Helper functions */
- // Create a 24 bit color value from R,G,B
- uint32_t Color(byte r, byte g, byte b)
- {
- uint32_t c;
- c = r;
- c <<= 8;
- c |= g;
- c <<= 8;
- c |= b;
- return c;
- }
- //Input a value 0 to 255 to get a color value.
- //The colours are a transition r - g -b - back to r
- uint32_t Wheel(byte WheelPos)
- {
- if (WheelPos < 85) {
- return Color(WheelPos * 3, 255 - WheelPos * 3, 0);
- } else if (WheelPos < 170) {
- WheelPos -= 85;
- return Color(255 - WheelPos * 3, 0, WheelPos * 3);
- } else {
- WheelPos -= 170;
- return Color(0, WheelPos * 3, 255 - WheelPos * 3);
- }
- }
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