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This code is written in C++ and it appears to be a library for controlling a WS2812 LED strip. The code provides several functions for animating the LEDs, including: * `pulseWhite(wait)`: This function makes the entire strip pulse white at a rate determined by the `wait` parameter. * `rainbowFade2White(wait, rainbowLoops, whiteLoops)`: This function creates a rainbow effect on the strip and then fades it to white over several loops. Here is a more detailed explanation of how the code works: 1. The `pulseWhite(wait)` function: * It uses two for-loops to ramp up and down the brightness of each pixel from 0 to 255. * In each iteration, it sets the color of each pixel using the `strip.Color(0, 0, 0, strip.gamma8(j))` method, where `j` is the current value of brightness. * It shows the new color on the strip using the `strip.show()` method. * The `wait` parameter determines how long to wait between each iteration. 2. The `rainbowFade2White(wait, rainbowLoops, whiteLoops)` function: * It uses a for-loop to create a rainbow effect on the strip. * In each iteration, it calculates the hue of each pixel using the `firstPixelHue + (i * 65536L / strip.numPixels())` formula, where `firstPixelHue` is the current value of the first pixel's hue and `i` is the index of the current pixel. * It sets the color of each pixel using the `strip.gamma32(strip.ColorHSV(pixelHue, 255, 255 * fadeVal / fadeMax))` method, where `pixelHue` is the calculated hue and `fadeVal` determines how much to fade the color. * It shows the new color on the strip using the `strip.show()` method. * The function repeats this process for several loops until it reaches a certain value of `firstPixelHue`. * After creating the rainbow effect, it fades the color to white over several iterations. Here is an example use case: ```cpp void setup() { FastLED.addLeds<WS2812B, DATA_PIN, GRB>(strip, NUM_LEDS).setCorrection(TypicalSMD5050); } void loop() { pulseWhite(50); // Make the strip pulse white at a rate of 20ms delay(1000); rainbowFade2White(20, 5, 5); // Create a rainbow effect and fade it to white over 5 loops } ``` This code would make the strip pulse white for 1 second and then create a rainbow effect that fades to white over several iterations.