Sid
Published © GPL3+

Control RGB LED Strip using Amazon Echo Alexa and NodeMCU

Control an RGB LED strip using Amazon Echo Alexa devices and NodeMCU.

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Control RGB LED Strip using Amazon Echo Alexa and NodeMCU

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Code

AmazonEcho_RGB_STRP_NodeMCU.ino

Arduino
/**********************************************************************************
   Code for controlling RGB Strip using Amazon Echo and NodeMCU

   Written by Sid for Sid's E Classroom

   https://www.youtube.com/c/SidsEClassroom
 *********************************************************************************/
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include "fauxmoESP.h"
#include <Adafruit_NeoPixel.h>

#define WIFI_SSID "abcd"//Set your Wifi name
#define WIFI_PASS "efgh"//Set your Wifi Password
#define SERIAL_BAUDRATE                 115200

fauxmoESP fauxmo;
//declare switching pins
#define RGBCTL D1 //Change pins according to your NodeMCU/ESP pinouts

int numPixels = 12;
int i;
//-----------------------------------------------------------------------------------------------
//Pixel initialization for Google's Colours
//Divide the total number of pixels in the stip by 4 and set pixel increments starting from zero
//If num of Pixels is not perfectly divisible by 4, consider the nearest multiple of 4
//eg: 28 in case of 29,30 and 31 pixels, 32 in case of 33,34 and 35 pixels.
//-----------------------------------------------------------------------------------------------
int start1 = 0;
int start2 = 3;
int start3 = 6;
int start4 = 9;

// Parameter 1 = number of pixels in strip
// Parameter 2 = Arduino pin number (most are valid)
// Parameter 3 = pixel type flags, add together as needed:
//   NEO_KHZ800  800 KHz bitstream (most NeoPixel products w/WS2812 LEDs)
//   NEO_KHZ400  400 KHz (classic 'v1' (not v2) FLORA pixels, WS2811 drivers)
//   NEO_GRB     Pixels are wired for GRB bitstream (most NeoPixel products)
//   NEO_RGB     Pixels are wired for RGB bitstream (v1 FLORA pixels, not v2)
//   NEO_RGBW    Pixels are wired for RGBW bitstream (NeoPixel RGBW products)
Adafruit_NeoPixel strip = Adafruit_NeoPixel(numPixels, RGBCTL, NEO_GRB + NEO_KHZ800);
// -----------------------------------------------------------------------------
// Wifi Setup
// -----------------------------------------------------------------------------

void wifiSetup() {

  // Set WIFI module to STA mode
  WiFi.mode(WIFI_STA);

  // Connect
  Serial.printf("[WIFI] Connecting to %s ", WIFI_SSID);
  WiFi.begin(WIFI_SSID, WIFI_PASS);

  // Wait
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(100);
  }
  Serial.println();

  // Connected!
  Serial.printf("[WIFI] STATION Mode, SSID: %s, IP address: %s\n", WiFi.SSID().c_str(), WiFi.localIP().toString().c_str());
}
// -----------------------------------------------------------------------------
// Device callback and printing response in serial monitor
// -----------------------------------------------------------------------------
void callback(uint8_t device_id, const char * device_name, bool state) {
  Serial.print("Device "); Serial.print(device_name);
  Serial.print(" state: ");
  if (state) {
    Serial.println("ON");
  } else {
    Serial.println("OFF");
  }
  //------------------------------------------------------------------------------
  //Switching action on detection of device name
  //------------------------------------------------------------------------------

  //Turns strip RED
  if ( (strcmp(device_name, "RED LIGHTS") == 0) ) {
    if (state) {
      i = 1;
    }
    else {
      allOff();
      i = 0;
    }
  }
  //Turns strip GREEN
  if ( (strcmp(device_name, "GREEN LIGHTS") == 0) ) {
    if (state) {
      i = 2;
    }
    else {
      allOff();
      i = 0;
    }
  }
  //Turns strip BLUE
  if ( (strcmp(device_name, "BLUE LIGHTS") == 0) ) {
    if (state) {
      i = 3;
    }
    else {
      allOff();
      i = 0;
    }
  }
  //RAINBOW pattern on the strip
  if ( (strcmp(device_name, "RAINBOW LIGHTS") == 0) ) {
    if (state) {
      i = 8;
    }
    else {
      allOff();
      i = 0;
    }
  }
  //Turns strip WHITE
  if ( (strcmp(device_name, "LIGHTS") == 0) ) {
    if (state) {
      i = 4;
    }
    else {
      allOff();
      i = 0;
    }
  }
  //Turns strip into Google's colours
  if ( (strcmp(device_name, "GOOGLE LIGHTS") == 0) ) {
    if (state) {
      i = 9;
    }
    else {
      allOff();
      i = 0;
    }
  }
}

void setup() {
  //Initialize pins to Low on device start
  pinMode(RGBCTL, OUTPUT);
  digitalWrite(RGBCTL, LOW);

  // Init serial port and clean garbage
  Serial.begin(SERIAL_BAUDRATE);
  Serial.println("FauxMo demo sketch");
  Serial.println("After connection, ask Alexa/Echo to 'turn <devicename> on' or 'off'");

  // Wifi
  wifiSetup();

  // Device Names for RGB Patterns
  fauxmo.addDevice("GREEN LIGHTS");
  fauxmo.addDevice("RED LIGHTS");
  fauxmo.addDevice("BLUE LIGHTS");
  fauxmo.addDevice("RAINBOW LIGHTS");
  fauxmo.addDevice("LIGHTS");
  fauxmo.addDevice("GOOGLE LIGHTS");
  fauxmo.onMessage(callback);
  
  strip.begin();
  strip.show();
  strip.setBrightness(5);
  
  i = 0;

}

void loop() {
  fauxmo.handle();
  startShow(i);
}

//Case for strip patterns. Add a new case or pattern if you wish
void startShow(int i) {
  switch (i) {
    case 0: colorWipe(strip.Color(0, 0, 0), 50);          // Black/Off
      break;
    case 1: colorWipe(strip.Color(255, 0, 0), 50);        // Red
      break;
    case 2: colorWipe(strip.Color(0, 255, 0), 50);        // Green
      break;
    case 3: colorWipe(strip.Color(0, 0, 255), 50);        // Blue
      break;
    case 4: colorWipe(strip.Color(255, 255, 255), 50);    // White
      break;
    case 5: theaterChase(strip.Color(127, 127, 127), 50); // White Chase
      break;
    case 6: theaterChase(strip.Color(127,   0,   0), 50); // Red Chase
      break;
    case 7: theaterChase(strip.Color(  0,   0, 127), 50); // Blue Chase
      break;
    case 8: rainbow(20);
      break;
    case 9: google();
      break;
    case 10: theaterChaseRainbow(50);
      break;
  }
}

// Fill the dots one after the other with a color
void colorWipe(uint32_t c, uint8_t wait) {
  for (uint16_t i = 0; i < strip.numPixels(); i++) {
    strip.setPixelColor(i, c);
    strip.show();
    delay(wait);
  }
}
//Rainbow pattern
void rainbow(uint8_t wait) {
  uint16_t i, j;

  for (j = 0; j < 256; j++) {
    for (i = 0; i < strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel((i + j) & 255));
    }
    strip.show();
    delay(wait);
  }
}
//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 < strip.numPixels(); i++) {
      strip.setPixelColor(i, Wheel(((i * 256 / strip.numPixels()) + j) & 255));
    }
    strip.show();
    delay(wait);
  }
}
//Theatre-style crawling lights
void theaterChase(uint32_t c, uint8_t wait) {
  for (int j = 0; j < 10; j++) { //do 10 cycles of chasing
    for (int q = 0; q < 3; q++) {
      for (int i = 0; i < strip.numPixels(); i = i + 3) {
        strip.setPixelColor(i + q, c);  //turn every third pixel on
      }
      strip.show();

      delay(wait);

      for (int i = 0; i < strip.numPixels(); i = i + 3) {
        strip.setPixelColor(i + q, 0);      //turn every third pixel off
      }
    }
  }
}
//Theatre-style crawling lights with rainbow effect
void theaterChaseRainbow(uint8_t wait) {
  for (int j = 0; j < 256; j++) {   // cycle all 256 colors in the wheel
    for (int q = 0; q < 3; q++) {
      for (int i = 0; i < strip.numPixels(); i = i + 3) {
        strip.setPixelColor(i + q, Wheel( (i + j) % 255)); //turn every third pixel on
      }
      strip.show();

      delay(wait);

      for (int i = 0; i < strip.numPixels(); i = i + 3) {
        strip.setPixelColor(i + q, 0);      //turn every third pixel off
      }
    }
  }
}
//Fill strip with Google's Colour
void google() {
  //Set initial couple of pixels to match Google Blue
  for ( int i = start1; i < start1 + 3; i++ ) {
    strip.setPixelColor(i, 23, 107, 239 );
  }
  //Set initial couple of pixels to match Google Red
  // next 3 pixels = color set #2
  for ( int i = start2; i < start2 + 3 ; i++ ) {
    strip.setPixelColor(i, 255, 62, 48 );
  }
  //Set initial couple of pixels to match Google Orange
  // next 3 pixels = color set #3
  for ( int i = start3; i < start3 + 3; i++ ) {
    strip.setPixelColor(i, 247, 181, 41 );
  }
  //Set initial couple of pixels to match Google Green
  // last 3 pixels = color set #3
  for ( int i = start4; i < start4 + 3; i++ ) {
    strip.setPixelColor(i, 23, 156, 82 );
  }

  strip.show();
}
//Turns all pixels OFF
void allOff() {
  for ( int i = 0; i < numPixels; i++ ) {
    strip.setPixelColor(i, 0, 0, 0 );
  }
  strip.show();
}

// 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) {
  WheelPos = 255 - WheelPos;
  if (WheelPos < 85) {
    return strip.Color(255 - WheelPos * 3, 0, WheelPos * 3);
  }
  if (WheelPos < 170) {
    WheelPos -= 85;
    return strip.Color(0, WheelPos * 3, 255 - WheelPos * 3);
  }
  WheelPos -= 170;
  return strip.Color(WheelPos * 3, 255 - WheelPos * 3, 0);
  
}

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Sid

Sid

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