RGB LED strip control with WS2811/WS2812 (a.k.a NeoPixel)

This sketch shows how to control WS2811/WS2812 (also known as NeoPixel) right from Z-Uno pins. There is no Z-Wave communication in this example. You can add a Switch Binary channel to turn your LEDs on off or even a Switch Multilevel to define the current LED mode.
  • Z-Uno board
  • Breadboard
  • NeoPixel strip or ring (like this or this)
  • 1 transistor 2N7000 FET
  • 1 1 kΩ resistor
  • 5 V power supply for the RGB strip
  • 7 wires
  • 5 wires
  • The 2N7000 transistor is used to invert the logic of the pin. WS2811 requires very fast communications and Z-Uno uses SPI to send data fast enough. But MOSI ping logic is inverted compared to what WS2811 expects.
  • WS2811 requires very fast communications and Z-Uno uses SPI to send data fast enough.

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    /*
     * This sketch shows how to control WS2811/WS2812 (also known as NeoPixel) right from Z-Uno pins.
     * There is no Z-Wave communication in this example.
     * You can add a Switch Binary channel to turn your LEDs on off or even a Switch Multilevel to define the current LED mode.
     * WS2811/WS2812 control pin should be connected to SPI MOSI (pin 2)
     */
    
    #include "ZUNO_NeoPixel.h"
    
    #define MAX_PIXELS 14 // NB! Z-Uno can not control more than 25 WS2811 without harming RF communications
    #define PIXEL_SIZE 3  // Three colors per pixel
    #define BUFF_SIZE (MAX_PIXELS * PIXEL_SIZE)
    
    byte pixel_buff[BUFF_SIZE];
    
    NeoPixel pixels(pixel_buff, BUFF_SIZE);
    
    void setup() {
      pixels.begin();
    }
    
    // An example of a rainbow equally distributed throughout
    void rainbowCycle(uint8_t wait) {
      byte i, j;
      for(j = 0; j < 256 * 5; j++) { // 5 cycles of all colors on wheel
        for(i = 0; i < MAX_PIXELS; i++) {
          pixels.setPixelColor(i, Wheel(((i * 256 / MAX_PIXELS) + j) & 255));
        }
        pixels.show();
        delay(wait);
      }
    }
    
    // Input a value 0 to 255 to get a color value.
    // The colours are a transition r - g - b - back to r.
    uint32_t Wheel(byte WheelPos) {
      if (WheelPos < 85) {
        return pixels.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
      } else if (WheelPos < 170) {
        WheelPos -= 85;
        return pixels.Color(255 - WheelPos * 3, 0, WheelPos * 3);
      } else {
        WheelPos -= 170;
        return pixels.Color(0, WheelPos * 3, 255 - WheelPos * 3);
      }
    }
    
    void loop() {
      rainbowCycle(5);
    }
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    /*
     * This sketch shows how to control WS2811/WS2812 (also known as NeoPixel) right from Z-Uno pins.
     * There is no Z-Wave communication in this example.
     * You can add a Switch Binary channel to turn your LEDs on off or even a Switch Multilevel to define the current LED mode.
     * WS2811/WS2812 control pin should be connected to SPI MOSI (pin 2)
     */
    
    #include "ZUNO_NeoPixel.h"
    
    // Which pin on the Arduino is connected to the NeoPixels?
    // On a Trinket or Gemma we suggest changing this to 1:
    #define LED_PIN     MOSI
    
    // How many NeoPixels are attached?
    #define LED_COUNT  14
    
    // NeoPixel brightness, 0 (min) to 255 (max)
    #define BRIGHTNESS 50 // Set BRIGHTNESS to about 1/5 (max = 255)
    
    void setup() {
      NeoPixel.addNeo(LED_PIN, LED_COUNT, BRIGHTNESS, NEO_GRBW | NEO_KHZ800); // Set BRIGHTNESS to about 1/5 (max = 255)
      NeoPixel.show(LED_PIN);            // Turn OFF all pixels
    }
    
    // An example of a rainbow equally distributed throughout
    void rainbowCycle(uint8_t wait) {
      uint16_t i, j;
    
      for(j=0; j< 256*5; j++) { // 5 cycles of all colors on wheel
        for(i=0; i< LED_COUNT; i++) {
          NeoPixel.setColor(LED_PIN, i, Wheel(((i * 256 / LED_COUNT) + j) & 255));
        }
        NeoPixel.show(LED_PIN);
        delay(wait);
      }
    }
    // Input a value 0 to 255 to get a color value.
    // The colours are a transition r - g - b - back to r.
    ZunoNeoColor_t Wheel(byte WheelPos) {
      WheelPos = 255 - WheelPos;
      if(WheelPos < 85) {
        return NeoPixel.RGB(255 - WheelPos * 3, 0, WheelPos * 3);
      }
      if(WheelPos < 170) {
        WheelPos -= 85;
        return NeoPixel.RGB(0, WheelPos * 3, 255 - WheelPos * 3);
      }
      WheelPos -= 170;
      return NeoPixel.RGB(WheelPos * 3, 255 - WheelPos * 3, 0);
    }
    
    void loop() {
      rainbowCycle(5);
    }
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