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libraries/FastLED/examples/ColorTemperature/ColorTemperature.ino

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+/// @file    ColorTemperature.ino
+/// @brief   Demonstrates how to use @ref ColorTemperature based color correction
+/// @example ColorTemperature.ino
+
+#include <FastLED.h>
+
+#define LED_PIN     3
+
+// Information about the LED strip itself
+#define NUM_LEDS    60
+#define CHIPSET     WS2811
+#define COLOR_ORDER GRB
+CRGB leds[NUM_LEDS];
+
+#define BRIGHTNESS  128
+
+
+// FastLED provides two color-management controls:
+//   (1) color correction settings for each LED strip, and
+//   (2) master control of the overall output 'color temperature' 
+//
+// THIS EXAMPLE demonstrates the second, "color temperature" control.
+// It shows a simple rainbow animation first with one temperature profile,
+// and a few seconds later, with a different temperature profile.
+//
+// The first pixel of the strip will show the color temperature.
+//
+// HELPFUL HINTS for "seeing" the effect in this demo:
+// * Don't look directly at the LED pixels.  Shine the LEDs aganst
+//   a white wall, table, or piece of paper, and look at the reflected light.
+//
+// * If you watch it for a bit, and then walk away, and then come back 
+//   to it, you'll probably be able to "see" whether it's currently using
+//   the 'redder' or the 'bluer' temperature profile, even not counting
+//   the lowest 'indicator' pixel.
+//
+//
+// FastLED provides these pre-conigured incandescent color profiles:
+//     Candle, Tungsten40W, Tungsten100W, Halogen, CarbonArc,
+//     HighNoonSun, DirectSunlight, OvercastSky, ClearBlueSky,
+// FastLED provides these pre-configured gaseous-light color profiles:
+//     WarmFluorescent, StandardFluorescent, CoolWhiteFluorescent,
+//     FullSpectrumFluorescent, GrowLightFluorescent, BlackLightFluorescent,
+//     MercuryVapor, SodiumVapor, MetalHalide, HighPressureSodium,
+// FastLED also provides an "Uncorrected temperature" profile
+//    UncorrectedTemperature;
+
+#define TEMPERATURE_1 Tungsten100W
+#define TEMPERATURE_2 OvercastSky
+
+// How many seconds to show each temperature before switching
+#define DISPLAYTIME 20
+// How many seconds to show black between switches
+#define BLACKTIME   3
+
+void loop()
+{
+  // draw a generic, no-name rainbow
+  static uint8_t starthue = 0;
+  fill_rainbow( leds + 5, NUM_LEDS - 5, --starthue, 20);
+
+  // Choose which 'color temperature' profile to enable.
+  uint8_t secs = (millis() / 1000) % (DISPLAYTIME * 2);
+  if( secs < DISPLAYTIME) {
+    FastLED.setTemperature( TEMPERATURE_1 ); // first temperature
+    leds[0] = TEMPERATURE_1; // show indicator pixel
+  } else {
+    FastLED.setTemperature( TEMPERATURE_2 ); // second temperature
+    leds[0] = TEMPERATURE_2; // show indicator pixel
+  }
+
+  // Black out the LEDs for a few secnds between color changes
+  // to let the eyes and brains adjust
+  if( (secs % DISPLAYTIME) < BLACKTIME) {
+    memset8( leds, 0, NUM_LEDS * sizeof(CRGB));
+  }
+  
+  FastLED.show();
+  FastLED.delay(8);
+}
+
+void setup() {
+  delay( 3000 ); // power-up safety delay
+  // It's important to set the color correction for your LED strip here,
+  // so that colors can be more accurately rendered through the 'temperature' profiles
+  FastLED.addLeds<CHIPSET, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalSMD5050 );
+  FastLED.setBrightness( BRIGHTNESS );
+}
+