Zigbee color bulb light show

The bulb goes full color: a color-dimmable light (real ZCL Color + Level clusters) joins the color-remote coordinator, which then walks it through a color wheel — a new hue every few seconds, no typing. Press the remote’s button to toggle the bulb; click the bulb for its live color. Both sketches are in the Code tab; every color command is a real 802.15.4 frame in the 📡 Sniffer.

How it works

The color bulb hides a C6 running ZigbeeColorDimmableLight firmware — real On/Off, Level, and Color ZCL clusters, like a Hue bulb. The remote DevKit is the coordinator: it binds the bulb, switches it on, and then walks a color wheel, sending a genuine ZCL color command every few seconds. The firmware’s RGB callback drives the internal WS2812, whose bit-banged frames the enclosure decodes into the glass color you see. The button on the remote sends a real Toggle.

What's on the bench

• 2× Battery
• Button
• ESP32-C6
• Zigbee Color Bulb

How it's wired

• Battery · pos→ESP32-C6 · vin
• Battery · neg→ESP32-C6 · gnd
• Button · a→ESP32-C6 · g9
• Button · b→ESP32-C6 · gnd2
• Battery · pos→Zigbee Color Bulb · vcc
• Battery · neg→Zigbee Color Bulb · gnd

The code

The exact Arduino C++ sketch(es) the bundled firmware was compiled from — shown in the simulator’s Code tab, where you can edit them and press Compile & upload to rebuild the board’s firmware.

// Zigbee color remote — the coordinator for the color bulb.
//
// Forms the network, binds the color-dimmable light, then puts on a show
// with no typing: every few seconds it walks the bulb through a color
// wheel with genuine ZCL Color/Level commands. Pressing BOOT toggles the
// bulb on/off.

#include <Arduino.h>
#ifndef ZIGBEE_MODE_ZCZR
#error "Zigbee coordinator mode is not selected in Tools->Zigbee mode"
#endif

#include "Zigbee.h"

#define SWITCH_ENDPOINT 5
uint8_t button = BOOT_PIN;

ZigbeeColorDimmerSwitch zbRemote = ZigbeeColorDimmerSwitch(SWITCH_ENDPOINT);

// A small color wheel the remote walks through.
static const uint8_t WHEEL[][3] = {
  {255, 40, 20},   // warm red
  {255, 160, 0},   // amber
  {60, 255, 60},   // green
  {40, 120, 255},  // blue
  {200, 60, 255},  // violet
  {255, 255, 220}, // warm white
};

void setup() {
  Serial.begin(115200);
  pinMode(button, INPUT_PULLUP);

  zbRemote.setManufacturerAndModel("Breadboard", "ColorRemote");
  zbRemote.allowMultipleBinding(true);

  Zigbee.addEndpoint(&zbRemote);
  Zigbee.setRebootOpenNetwork(180);

  if (!Zigbee.begin(ZIGBEE_COORDINATOR)) {
    Serial.println("Zigbee failed to start!");
    Serial.println("Rebooting...");
    ESP.restart();
  }

  Serial.println("Network formed and open. Waiting for the color bulb to bind");
  while (!zbRemote.bound()) {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.println("Bulb bound - starting the color show (press BOOT to toggle).");
  delay(1000);
  zbRemote.lightOn();
  zbRemote.setLightLevel(220);
}

void loop() {
  // BOOT toggles the bulb (debounced on release).
  if (digitalRead(button) == LOW) {
    delay(100);
    while (digitalRead(button) == LOW) {
      delay(50);
    }
    zbRemote.lightToggle();
    Serial.println("TOGGLE sent");
  }

  // Walk the color wheel while bound.
  static uint32_t lastStep = 0;
  static size_t idx = 0;
  if (millis() - lastStep >= 5000) {
    lastStep = millis();
    const uint8_t *c = WHEEL[idx];
    idx = (idx + 1) % (sizeof(WHEEL) / sizeof(WHEEL[0]));
    zbRemote.setLightColor(c[0], c[1], c[2]);
    Serial.printf("color -> rgb(%u,%u,%u)\r\n", c[0], c[1], c[2]);
  }
  delay(50);
}

// Zigbee color bulb — a color-dimmable light end device (like a Hue bulb).
//
// The coordinator's ZCL On/Off, Level and Color commands land here; the
// combined state drives the DevKit's WS2812 (RGB_BUILTIN), which the bulb
// enclosure renders as the glass color.

#include <Arduino.h>
#ifndef ZIGBEE_MODE_ED
#error "Zigbee end device mode is not selected in Tools->Zigbee mode"
#endif

#include "Zigbee.h"

#define ZIGBEE_LIGHT_ENDPOINT 10
uint8_t led = RGB_BUILTIN;

ZigbeeColorDimmableLight zbColorLight = ZigbeeColorDimmableLight(ZIGBEE_LIGHT_ENDPOINT);

void setRGB(bool state, uint8_t red, uint8_t green, uint8_t blue, uint8_t level) {
  if (!state) {
    rgbLedWrite(led, 0, 0, 0);
    Serial.println("light OFF");
    return;
  }
  // Scale the color by the level (ZCL level control), like a real bulb.
  uint8_t r = (uint16_t)red * level / 255;
  uint8_t g = (uint16_t)green * level / 255;
  uint8_t b = (uint16_t)blue * level / 255;
  rgbLedWrite(led, r, g, b);
  Serial.printf("light ON  rgb(%u,%u,%u) level %u\r\n", red, green, blue, level);
}

void setup() {
  Serial.begin(115200);

  rgbLedWrite(led, 0, 0, 0);

  zbColorLight.setManufacturerAndModel("Breadboard", "ColorBulb");
  zbColorLight.onLightChangeRgb(setRGB);

  Serial.println("Adding ZigbeeColorDimmableLight endpoint to Zigbee Core");
  Zigbee.addEndpoint(&zbColorLight);

  if (!Zigbee.begin()) {
    Serial.println("Zigbee failed to start!");
    Serial.println("Rebooting...");
    ESP.restart();
  }
  Serial.println("Connecting to network");
  while (!Zigbee.connected()) {
    Serial.print(".");
    delay(100);
  }
  Serial.println();
  Serial.println("Joined as a color bulb.");
}

void loop() {
  delay(100);
}

Try this

• Let the bulb join and bind, then just watch: a new color every 5 seconds.
• Press the remote’s button to toggle the bulb off and on mid-show.
• Click the bulb: the Inspector shows the live color as hex.
• Open the 📡 Sniffer and match each color change to its ZCL frame.

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