Control a 5050 RGB LED Strip with ESP32 or ESP8266 using Alexa and Google Home

// Red, green, and blue pins for PWM control
const int ledR = 14;   
const int ledG = 12;   
const int bluePin = 27;
 
uint8_t color = 0;          // a value from 0 to 255 representing the hue
uint32_t R, G, B;           // the Red Green and Blue color components
uint8_t brightness = 255;  // 255 is maximum brightness, but can be changed.  Might need 256 for common anode to fully turn off.
bool invert = false;

void hueToRGB(uint8_t hue, uint8_t brightness);

void setup() {
  Serial.begin(115200);
  delay(10); 

  ledcAttachPin(ledR, 1);
  ledcAttachPin(ledG, 2);
  ledcAttachPin(ledB, 3); 

  // Initialize channels 
  // channels 0-15, resolution 1-16 bits, freq limits depend on resolution
  // ledcSetup(uint8_t channel, uint32_t freq, uint8_t resolution_bits);
  ledcSetup(1, 12000, 8); // 12 kHz PWM, 8-bit resolution
  ledcSetup(2, 12000, 8);
  ledcSetup(3, 12000, 8);
}

void loop(){
   for (color = 0; color < 255; color++) { // Slew through the color spectrum
    hueToRGB(color, brightness);  // call function to convert hue to RGB

    // write the RGB values to the pins
    ledcWrite(1, R); // write red component to channel 1, etc.
    ledcWrite(2, G);   
    ledcWrite(3, B); 
  
    delay(100); // full cycle of rgb over 256 colors takes 26 seconds
 }  
}

// Courtesy http://www.instructables.com/id/How-to-Use-an-RGB-LED/?ALLSTEPS
// function to convert a color to its Red, Green, and Blue components.

void hueToRGB(uint8_t hue, uint8_t brightness) {
    uint16_t scaledHue = (hue * 6);
    uint8_t segment = scaledHue / 256; // segment 0 to 5 around the
                                            // color wheel
    uint16_t segmentOffset =
      scaledHue - (segment * 256); // position within the segment

    uint8_t complement = 0;
    uint16_t prev = (brightness * ( 255 -  segmentOffset)) / 256;
    uint16_t next = (brightness *  segmentOffset) / 256;

    if(invert)
    {
      brightness = 255 - brightness;
      complement = 255;
      prev = 255 - prev;
      next = 255 - next;
    }

    switch(segment ) {
    case 0:      // red
        R = brightness;
        G = next;
        B = complement;
    break;
    case 1:     // yellow
        R = prev;
        G = brightness;
        B = complement;
    break;
    case 2:     // green
        R = complement;
        G = brightness;
        B = next;
    break;
    case 3:    // cyan
        R = complement;
        G = prev;
        B = brightness;
    break;
    case 4:    // blue
        R = next;
        G = complement;
        B = brightness;
    break;
   case 5:      // magenta
    default:
        R = brightness;
        G = complement;
        B = prev;
    break;
    }
}

// Uncomment the following line to enable serial debug output
//#define ENABLE_DEBUG

#ifdef ENABLE_DEBUG
    #define DEBUG_ESP_PORT Serial
    #define NODEBUG_WEBSOCKETS
    #define NDEBUG
#endif 

#include <Arduino.h>
#if defined(ESP8266)
  #include <ESP8266WiFi.h>
#elif defined(ESP32) || defined(ARDUINO_ARCH_RP2040)
  #include <WiFi.h>
#endif

#include <SinricPro.h>
#include <SinricProLight.h>

#include <map>

#define WIFI_SSID  ""
#define WIFI_PASS  ""
#define APP_KEY    ""     // Should look like "de0bxxxx-1x3x-4x3x-ax2x-5dabxxxxxxxx"
#define APP_SECRET ""  // Should look like "5f36xxxx-x3x7-4x3x-xexe-e86724a9xxxx-4c4axxxx-3x3x-x5xe-x9x3-333d65xxxxxx"
#define LIGHT_ID   ""   // Should look like "5dc1564130xxxxxxxxxxxxxx"
#define BAUD_RATE  115200              // Change baudrate to your need for serial log

#define BLUE_PIN  27  // PIN for BLUE BC337 NPN transistor  - change this to your need (D5 = GPIO14 on ESP8266)
#define RED_PIN   14  // PIN for RED BC337 NPN transistor   - change this to your need (D6 = GPIO12 on ESP8266)
#define GREEN_PIN 12  // PIN for GREEN BC337 NPN transistor - change this to your need (D7 = GPIO13 on ESP8266)

struct Color {
    uint8_t r;
    uint8_t g;
    uint8_t b;
};

// Colortemperature lookup table
using ColorTemperatures = std::map<uint16_t, Color>;
ColorTemperatures colorTemperatures{
    //   {Temperature value, {color r, g, b}}
    {2000, {255, 138, 18}},
    {2200, {255, 147, 44}},
    {2700, {255, 169, 87}},
    {3000, {255, 180, 107}},
    {4000, {255, 209, 163}},
    {5000, {255, 228, 206}},
    {5500, {255, 236, 224}},
    {6000, {255, 243, 239}},
    {6500, {255, 249, 253}},
    {7000, {245, 243, 255}},
    {7500, {235, 238, 255}},
    {9000, {214, 225, 255}}};

struct DeviceState {                                   // Stores current device state with following initial values:
    bool  powerState       = false;                    // initial state is off
    Color color            = colorTemperatures[9000];  // color is set to white (9000k)
    int   colorTemperature = 9000;                     // color temperature is set to 9000k
    int   brightness       = 100;                      // brightness is set to 100
} device_state;

SinricProLight& myLight = SinricPro[LIGHT_ID];  // SinricProLight device

void setStripe() {
    int rValue = map(device_state.color.r * device_state.brightness, 0, 255 * 100, 0, 1023);  // calculate red value and map between 0 and 1023 for analogWrite
    int gValue = map(device_state.color.g * device_state.brightness, 0, 255 * 100, 0, 1023);  // calculate green value and map between 0 and 1023 for analogWrite
    int bValue = map(device_state.color.b * device_state.brightness, 0, 255 * 100, 0, 1023);  // calculate blue value and map between 0 and 1023 for analogWrite

    if (device_state.powerState == false) {  // turn off?
        analogWrite(RED_PIN, LOW);          
        analogWrite(GREEN_PIN, LOW);        
        analogWrite(BLUE_PIN, LOW);         
    } else {
        analogWrite(RED_PIN, rValue);    // write red value to pin
        analogWrite(GREEN_PIN, gValue);  // write green value to pin
        analogWrite(BLUE_PIN, bValue);   // write blue value to pin
    }
}

bool onPowerState(const String& deviceId, bool& state) {
    device_state.powerState = state;  // store the new power state
    setStripe();                      // update the BC337 NPN transistors
    return true;
}

bool onBrightness(const String& deviceId, int& brightness) {
    device_state.brightness = brightness;  // store new brightness level
    setStripe();                           // update the BC337 NPN transistors
    return true;
}

bool onAdjustBrightness(const String& deviceId, int& brightnessDelta) {
    device_state.brightness += brightnessDelta;  // calculate and store new absolute brightness
    brightnessDelta = device_state.brightness;   // return absolute brightness
    setStripe();                                 // update the BC337 NPN transistors
    return true;
}

bool onColor(const String& deviceId, byte& r, byte& g, byte& b) {
    device_state.color.r = r;  // store new red value
    device_state.color.g = g;  // store new green value
    device_state.color.b = b;  // store new blue value
    setStripe();               // update the BC337 NPN transistors
    return true;
}

bool onColorTemperature(const String& deviceId, int& colorTemperature) {
    device_state.color            = colorTemperatures[colorTemperature];  // set rgb values from corresponding colortemperauture
    device_state.colorTemperature = colorTemperature;                     // store the current color temperature
    setStripe();                                                          // update the BC337 NPN transistors
    return true;
}

bool onIncreaseColorTemperature(const String& devceId, int& colorTemperature) {
    auto current = colorTemperatures.find(device_state.colorTemperature);  // get current entry from colorTemperature map
    auto next    = std::next(current);                                     // get next element
    if (next == colorTemperatures.end()) next = current;                   // prevent past last element
    device_state.color            = next->second;                          // set color
    device_state.colorTemperature = next->first;                           // set colorTemperature
    colorTemperature              = device_state.colorTemperature;         // return new colorTemperature
    setStripe();
    return true;
}

bool onDecreaseColorTemperature(const String& devceId, int& colorTemperature) {
    auto current = colorTemperatures.find(device_state.colorTemperature);  // get current entry from colorTemperature map
    auto next    = std::prev(current);                                     // get previous element
    if (next == colorTemperatures.end()) next = current;                   // prevent before first element
    device_state.color            = next->second;                          // set color
    device_state.colorTemperature = next->first;                           // set colorTemperature
    colorTemperature              = device_state.colorTemperature;         // return new colorTemperature
    setStripe();
    return true;
}

void setupWiFi() {
    Serial.printf("WiFi: connecting");

    #if defined(ESP8266)
        WiFi.setSleepMode(WIFI_NONE_SLEEP); 
        WiFi.setAutoReconnect(true);
    #elif defined(ESP32)
        WiFi.setSleep(false); 
        WiFi.setAutoReconnect(true);
    #endif

    WiFi.begin(WIFI_SSID, WIFI_PASS); 
    
    while (WiFi.status() != WL_CONNECTED) {
        Serial.printf(".");
        delay(250);
    }
    Serial.printf("connected\r\nIP is %s\r\n", WiFi.localIP().toString().c_str());
}

void setupSinricPro() {
    myLight.onPowerState(onPowerState);                              // assign onPowerState callback
    myLight.onBrightness(onBrightness);                              // assign onBrightness callback
    myLight.onAdjustBrightness(onAdjustBrightness);                  // assign onAdjustBrightness callback
    myLight.onColor(onColor);                                        // assign onColor callback
    myLight.onColorTemperature(onColorTemperature);                  // assign onColorTemperature callback
    myLight.onDecreaseColorTemperature(onDecreaseColorTemperature);  // assign onDecreaseColorTemperature callback
    myLight.onIncreaseColorTemperature(onIncreaseColorTemperature);  // assign onIncreaseColorTemperature callback

    SinricPro.begin(APP_KEY, APP_SECRET);  // start SinricPro
}

void setup() {
    Serial.begin(BAUD_RATE);  // setup serial

    pinMode(RED_PIN, OUTPUT);    // set red-BC337 NPN transistor pin as output
    pinMode(GREEN_PIN, OUTPUT);  // set green-BC337 NPN transistor pin as output
    pinMode(BLUE_PIN, OUTPUT);   // set blue-BC337 NPN transistor pin as output

    setupWiFi();       // connect wifi
    setupSinricPro();  // setup SinricPro
}

void loop() {
    SinricPro.handle();  // handle SinricPro communication
}