98 lines
2.8 KiB
C++
98 lines
2.8 KiB
C++
// NeoPixelFunLoop
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// This example will move a trail of light around a series of pixels.
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// A ring formation of pixels looks best.
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// The trail will have a slowly fading tail.
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//
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// This will demonstrate the use of the RotateRight method.
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//
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#include <NeoPixelBus.h>
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#include <NeoPixelAnimator.h>
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const uint16_t PixelCount = 16; // make sure to set this to the number of pixels in your strip
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const uint16_t PixelPin = 2; // make sure to set this to the correct pin, ignored for Esp8266
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const uint16_t AnimCount = 1; // we only need one
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const uint16_t TailLength = 6; // length of the tail, must be shorter than PixelCount
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const float MaxLightness = 0.4f; // max lightness at the head of the tail (0.5f is full bright)
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NeoGamma<NeoGammaTableMethod> colorGamma; // for any fade animations, best to correct gamma
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NeoPixelBus<NeoGrbFeature, Neo800KbpsMethod> strip(PixelCount, PixelPin);
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// for esp8266 omit the pin
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//NeoPixelBus<NeoGrbFeature, Neo800KbpsMethod> strip(PixelCount);
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NeoPixelAnimator animations(AnimCount); // NeoPixel animation management object
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void SetRandomSeed()
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{
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uint32_t seed;
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// random works best with a seed that can use 31 bits
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// analogRead on a unconnected pin tends toward less than four bits
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seed = analogRead(0);
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delay(1);
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for (int shifts = 3; shifts < 31; shifts += 3)
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{
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seed ^= analogRead(0) << shifts;
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delay(1);
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}
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// Serial.println(seed);
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randomSeed(seed);
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}
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void LoopAnimUpdate(const AnimationParam& param)
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{
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// wait for this animation to complete,
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// we are using it as a timer of sorts
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if (param.state == AnimationState_Completed)
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{
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// done, time to restart this position tracking animation/timer
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animations.RestartAnimation(param.index);
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// rotate the complete strip one pixel to the right on every update
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strip.RotateRight(1);
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}
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}
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void DrawTailPixels()
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{
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// using Hsl as it makes it easy to pick from similiar saturated colors
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float hue = random(360) / 360.0f;
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for (uint16_t index = 0; index < strip.PixelCount() && index <= TailLength; index++)
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{
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float lightness = index * MaxLightness / TailLength;
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RgbColor color = HslColor(hue, 1.0f, lightness);
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strip.SetPixelColor(index, colorGamma.Correct(color));
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}
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}
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void setup()
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{
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strip.Begin();
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strip.Show();
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SetRandomSeed();
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// Draw the tail that will be rotated through all the rest of the pixels
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DrawTailPixels();
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// we use the index 0 animation to time how often we rotate all the pixels
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animations.StartAnimation(0, 66, LoopAnimUpdate);
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}
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void loop()
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{
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// this is all that is needed to keep it running
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// and avoiding using delay() is always a good thing for
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// any timing related routines
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animations.UpdateAnimations();
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strip.Show();
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}
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