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// Simple demonstration on using an input device to trigger changes on your |
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// NeoPixels. Wire a momentary push button to connect from ground to a |
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// digital IO pin. When the button is pressed it will change to a new pixel |
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// animation. Initial state has all pixels off -- press the button once to |
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// start the first animation. As written, the button does not interrupt an |
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// animation in-progress, it works only when idle. |
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#include <Adafruit_NeoPixel.h> |
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#ifdef __AVR__ |
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#include <avr/power.h> // Required for 16 MHz Adafruit Trinket |
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#endif |
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// Digital IO pin connected to the button. This will be driven with a |
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// pull-up resistor so the switch pulls the pin to ground momentarily. |
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// On a high -> low transition the button press logic will execute. |
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#define BUTTON_PIN 1 |
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#define LED_PIN 2 // in-switch LED |
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#define PIXEL_PIN 3 // Digital IO pin connected to the NeoPixels. |
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#define PIXEL_COUNT 4 // Number of NeoPixels |
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// Declare our NeoPixel strip object: |
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Adafruit_NeoPixel strip(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800); |
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// Argument 1 = Number of pixels in NeoPixel strip |
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// Argument 2 = Arduino pin number (most are valid) |
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// Argument 3 = Pixel type flags, add together as needed: |
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// NEO_KHZ800 800 KHz bitstream (most NeoPixel products w/WS2812 LEDs) |
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// NEO_KHZ400 400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers) |
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// NEO_GRB Pixels are wired for GRB bitstream (most NeoPixel products) |
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// NEO_RGB Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2) |
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// NEO_RGBW Pixels are wired for RGBW bitstream (NeoPixel RGBW products) |
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boolean oldState = HIGH; |
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int mode = 0; // Currently-active animation mode, 0-9 |
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void setup() { |
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pinMode(BUTTON_PIN, INPUT_PULLUP); |
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strip.begin(); // Initialize NeoPixel strip object (REQUIRED) |
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strip.show(); // Initialize all pixels to 'off' |
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pinMode(LED_PIN, OUTPUT); |
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digitalWrite(LED_PIN, LOW); |
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} |
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void loop() { |
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// Get current button state. |
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boolean newState = digitalRead(BUTTON_PIN); |
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// Check if state changed from high to low (button press). |
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if((newState == LOW) && (oldState == HIGH)) { |
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// Short delay to debounce button. |
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delay(20); |
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// Check if button is still low after debounce. |
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newState = digitalRead(BUTTON_PIN); |
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if(newState == LOW) { // Yes, still low |
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digitalWrite(LED_PIN, !digitalRead(LED_PIN)); //Toggle the in-switch LED |
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if(++mode > 8) mode = 0; // Advance to next mode, wrap around after #8 |
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switch(mode) { // Start the new animation... |
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case 0: |
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colorWipe(strip.Color( 0, 0, 0), 50); // Black/off |
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break; |
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case 1: |
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colorWipe(strip.Color(255, 0, 0), 50); // Red |
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break; |
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case 2: |
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colorWipe(strip.Color( 0, 255, 0), 50); // Green |
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break; |
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case 3: |
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colorWipe(strip.Color( 0, 0, 255), 50); // Blue |
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break; |
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case 4: |
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theaterChase(strip.Color(127, 127, 127), 50); // White |
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break; |
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case 5: |
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theaterChase(strip.Color(127, 0, 0), 50); // Red |
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break; |
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case 6: |
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theaterChase(strip.Color( 0, 0, 127), 50); // Blue |
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break; |
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case 7: |
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rainbow(10); |
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break; |
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case 8: |
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theaterChaseRainbow(50); |
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break; |
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} |
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} |
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} |
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// Set the last-read button state to the old state. |
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oldState = newState; |
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} |
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// Fill strip pixels one after another with a color. Strip is NOT cleared |
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// first; anything there will be covered pixel by pixel. Pass in color |
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// (as a single 'packed' 32-bit value, which you can get by calling |
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// strip.Color(red, green, blue) as shown in the loop() function above), |
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// and a delay time (in milliseconds) between pixels. |
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void colorWipe(uint32_t color, int wait) { |
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for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip... |
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strip.setPixelColor(i, color); // Set pixel's color (in RAM) |
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strip.show(); // Update strip to match |
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delay(wait); // Pause for a moment |
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} |
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} |
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// Theater-marquee-style chasing lights. Pass in a color (32-bit value, |
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// a la strip.Color(r,g,b) as mentioned above), and a delay time (in ms) |
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// between frames. |
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void theaterChase(uint32_t color, int wait) { |
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for(int a=0; a<10; a++) { // Repeat 10 times... |
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for(int b=0; b<3; b++) { // 'b' counts from 0 to 2... |
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strip.clear(); // Set all pixels in RAM to 0 (off) |
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// 'c' counts up from 'b' to end of strip in steps of 3... |
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for(int c=b; c<strip.numPixels(); c += 3) { |
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strip.setPixelColor(c, color); // Set pixel 'c' to value 'color' |
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} |
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strip.show(); // Update strip with new contents |
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delay(wait); // Pause for a moment |
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} |
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} |
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} |
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// Rainbow cycle along whole strip. Pass delay time (in ms) between frames. |
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void rainbow(int wait) { |
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// Hue of first pixel runs 3 complete loops through the color wheel. |
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// Color wheel has a range of 65536 but it's OK if we roll over, so |
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// just count from 0 to 3*65536. Adding 256 to firstPixelHue each time |
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// means we'll make 3*65536/256 = 768 passes through this outer loop: |
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for(long firstPixelHue = 0; firstPixelHue < 3*65536; firstPixelHue += 256) { |
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for(int i=0; i<strip.numPixels(); i++) { // For each pixel in strip... |
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// Offset pixel hue by an amount to make one full revolution of the |
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// color wheel (range of 65536) along the length of the strip |
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// (strip.numPixels() steps): |
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int pixelHue = firstPixelHue + (i * 65536L / strip.numPixels()); |
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// strip.ColorHSV() can take 1 or 3 arguments: a hue (0 to 65535) or |
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// optionally add saturation and value (brightness) (each 0 to 255). |
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// Here we're using just the single-argument hue variant. The result |
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// is passed through strip.gamma32() to provide 'truer' colors |
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// before assigning to each pixel: |
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strip.setPixelColor(i, strip.gamma32(strip.ColorHSV(pixelHue))); |
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} |
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strip.show(); // Update strip with new contents |
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delay(wait); // Pause for a moment |
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} |
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} |
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// Rainbow-enhanced theater marquee. Pass delay time (in ms) between frames. |
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void theaterChaseRainbow(int wait) { |
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int firstPixelHue = 0; // First pixel starts at red (hue 0) |
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for(int a=0; a<30; a++) { // Repeat 30 times... |
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for(int b=0; b<3; b++) { // 'b' counts from 0 to 2... |
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strip.clear(); // Set all pixels in RAM to 0 (off) |
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// 'c' counts up from 'b' to end of strip in increments of 3... |
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for(int c=b; c<strip.numPixels(); c += 3) { |
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// hue of pixel 'c' is offset by an amount to make one full |
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// revolution of the color wheel (range 65536) along the length |
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// of the strip (strip.numPixels() steps): |
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int hue = firstPixelHue + c * 65536L / strip.numPixels(); |
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uint32_t color = strip.gamma32(strip.ColorHSV(hue)); // hue -> RGB |
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strip.setPixelColor(c, color); // Set pixel 'c' to value 'color' |
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} |
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strip.show(); // Update strip with new contents |
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delay(wait); // Pause for a moment |
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firstPixelHue += 65536 / 90; // One cycle of color wheel over 90 frames |
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} |
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} |
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} |