#include <Adafruit_NeoPixel.h> | |
#define PIN 3 | |
#define LEDCOUNT 23 | |
#define SPEED 5 | |
const uint8_t PROGMEM gamma[] = { | |
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | |
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, | |
1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, | |
2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 4, 5, 5, 5, | |
5, 6, 6, 6, 6, 7, 7, 7, 7, 8, 8, 8, 9, 9, 9, 10, | |
10, 10, 11, 11, 11, 12, 12, 13, 13, 13, 14, 14, 15, 15, 16, 16, | |
17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 24, 24, 25, | |
25, 26, 27, 27, 28, 29, 29, 30, 31, 32, 32, 33, 34, 35, 35, 36, | |
37, 38, 39, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 50, | |
51, 52, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 66, 67, 68, | |
69, 70, 72, 73, 74, 75, 77, 78, 79, 81, 82, 83, 85, 86, 87, 89, | |
90, 92, 93, 95, 96, 98, 99,101,102,104,105,107,109,110,112,114, | |
115,117,119,120,122,124,126,127,129,131,133,135,137,138,140,142, | |
144,146,148,150,152,154,156,158,160,162,164,167,169,171,173,175, | |
177,180,182,184,186,189,191,193,196,198,200,203,205,208,210,213, | |
215,218,220,223,225,228,231,233,236,239,241,244,247,249,252,255 }; | |
// Parameter 1 = number of pixels in strip | |
// Parameter 2 = pin number (most are valid) | |
// Parameter 3 = pixel type flags, add together as needed: | |
// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs) | |
// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers) | |
// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products) | |
// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2) | |
Adafruit_NeoPixel strip = Adafruit_NeoPixel(LEDCOUNT, PIN, NEO_GRB + NEO_KHZ800); | |
byte stripBuffer[LEDCOUNT]; | |
long currentPos; | |
long maxPos; | |
bool direction = true; | |
void setup() { | |
maxPos = (LEDCOUNT - 1) * 256; | |
strip.begin(); | |
strip.show(); // Initialize all pixels to 'off' | |
} | |
byte cyclesToSkipDecay = 0; | |
#define DECAYCYCLESKIP 3 | |
void loop() { | |
if (direction) { | |
currentPos += 4; | |
if (currentPos >= maxPos) { | |
direction = false; | |
} | |
} else { | |
currentPos -= 4; | |
if (currentPos <= 0) { | |
direction = true; | |
} | |
} | |
if (cyclesToSkipDecay == 0) { | |
decayLEDs(); | |
cyclesToSkipDecay = DECAYCYCLESKIP; | |
} else { | |
cyclesToSkipDecay --; | |
} | |
drawDot(currentPos); | |
refreshLEDs(); | |
//delay(SPEED); | |
} | |
void drawDot(long thePos) { | |
// first half | |
byte theLED = thePos / 256; | |
byte theBright = thePos ^ 256; | |
if (stripBuffer[theLED+1] < theBright) { stripBuffer[theLED+1] = theBright; } | |
theBright = 255 - theBright; | |
if (stripBuffer[theLED] < theBright) { stripBuffer[theLED] = theBright; } | |
} | |
void decayLEDs() { | |
for (int i = 0; i < LEDCOUNT; i++) { | |
if (stripBuffer[i] > 0) { stripBuffer[i] -= 1; } | |
} | |
} | |
void refreshLEDs() { | |
for (int i = 0; i < LEDCOUNT; i++) { | |
strip.setPixelColor(i,pgm_read_byte(&gamma[stripBuffer[i]]),0,0); | |
} | |
strip.show(); | |
} |
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