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WS2812 Strip Multi-Mode

In addition to having the WS2812 Strip display one color or one LED at a time, you can control 8 LEDs at a time and have them each display a different color.

Schematic

../_images/WS2812_Mode2.png

Wiring

../_images/WS2812_Mode2_fritz.png

Code

After the program is running, every time you press the switch, WS2812 will change a mode, there are four modes in total.

How it works?

Adafruit_NeoPixel strip(PIXEL_COUNT, PIXEL_PIN, NEO_GRB + NEO_KHZ800)

Create object strip to control ws2812 and declare the number of LED pixels, pin number and Pixel type flags.

boolean lastButtonState = LOW

Set the initial state of the button to LOW, which means the button is not pressed.

boolean currentButtonState = digitalRead(BUTTON_PIN);

// Check if button press.
if ((currentButtonState == LOW) && (lastButtonState == HIGH)) {
  // Short delay to debounce button.
  delay(20);

  mode = (mode + 1) % 4;
  switch (mode) {          // Start the new animation...
    case 0:
      colorWipe(strip.Color(  255,   127,   0), 50);
      break;
    case 1:
      theaterChase(strip.Color(  0,   127, 127), 100);
      break;
    case 2:
      rainbow(10);
      break;
    case 3:
      theaterChaseRainbow(100);
      break;
}

Firstly, the value of the button is read, and when the button is detected from pressed to released, it enters into the mode selection. There are 4 modes:

  • colorWipe(): From the left ( wired side ) to the right, light up one led every 50ms, after all light up, wait 500ms, then from left to right, turn off one led every 50ms(variable wait), until all off.

  • theaterChase(): First light up the WS2812 Strip on the 1st (wired side), 4, 7 position of the LED, wait 50ms after extinguishing; then light up 2, 5, 8 of the led, wait 50ms after extinguishing; finally light up 3, 6 of the led, wait 50ms after extinguishing. The whole process is cycled 10 times, due to the short interval thus achieving the effect of flow.

  • rainbow(): Different colors are displayed on 8 LEDs, and then these 8 colors flow from right to left (wired side), flowing 3 times and then stopping.

  • theaterChaseRainbow(): Add flow effect to rainbow().