90 lines
3.1 KiB
Arduino
90 lines
3.1 KiB
Arduino
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/* easing
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*
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* By: Andrew Tuline
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*
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* Date: August, 2015
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*
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* This boring display demonstrates the easing capability of FastLED. The Red LED starts out slow, speeds up and then slows down when it gets to the end.
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*
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* It uses uint8_t variables and may not work correctly on longer strands . . as noted by GitHub user fahrvergnuunen.
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*
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* easeOutVal = ease8InOutQuad(easeInVal); // Start with easeInVal at 0 and then go to 255 for the full easing.
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* ledNum = lerp8by8(0, NUM_LEDS, easeOutVal); // Map it to the number of LED's you have.
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*
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* Reference:
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*
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* https://github.com/FastLED/FastLED/wiki/High-performance-math
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*
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*
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* Ideas:
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* - Ease from 128 to 255 to throw something in the air
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* - Ease from 255 to 128 and reverse direction for it to fall back.
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* - Reduce the lerp8 value after each cycle to simulate a bouncing ball.
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*
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*/
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#include "FastLED.h" // FastLED library. Please use the latest development version.
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#if FASTLED_VERSION < 3001000
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#error "Requires FastLED 3.1 or later; check github for latest code."
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#endif
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// Fixed definitions cannot change on the fly.
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#define LED_DT 12 // Data pin to connect to the strip.
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#define LED_CK 11 // Clock pin for WS2801 or APA102.
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#define COLOR_ORDER BGR // It's GRB for WS2812 and BGR for APA102.
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#define LED_TYPE APA102 // Using APA102, WS2812, WS2801. Don't forget to change LEDS.addLeds.
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#define NUM_LEDS 250 // Number of LED's.
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// Global variables can be changed on the fly.
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uint8_t max_bright = 128; // Overall brightness definition. It can be changed on the fly.
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struct CRGB leds[NUM_LEDS]; // Initialize our LED array.
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int thisdelay = 20;
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void setup() {
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delay(1000); // Power-up safety delay.
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LEDS.addLeds<LED_TYPE, LED_DT, LED_CK, COLOR_ORDER>(leds, NUM_LEDS); // Use this for WS2801 or APA102
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// LEDS.addLeds<LED_TYPE, LED_DT, COLOR_ORDER>(leds, NUM_LEDS); // Use this for WS2812
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FastLED.setBrightness(max_bright);
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set_max_power_in_volts_and_milliamps(5, 500); // FastLED Power management set at 5V, 500mA.
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} // setup()
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void loop() {
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EVERY_N_MILLISECONDS(thisdelay) { // FastLED based non-blocking delay to update/display the sequence.
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ease();
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}
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FastLED.show();
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} // loop()
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void ease() {
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static uint8_t easeOutVal = 0;
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static uint8_t easeInVal = 0;
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static uint8_t lerpVal = 0;
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easeOutVal = ease8InOutQuad(easeInVal); // Start with easeInVal at 0 and then go to 255 for the full easing.
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easeInVal++;
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lerpVal = lerp8by8(0, NUM_LEDS, easeOutVal); // Map it to the number of LED's you have.
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leds[lerpVal] = CRGB::Red;
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fadeToBlackBy(leds, NUM_LEDS, 16); // 8 bit, 1 = slow fade, 255 = fast fade
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} // ease()
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