Things used in this project

Hardware components:
Amazon echo dot
Amazon Alexa Echo Dot
Or any other device running Alexa
×1
Esp01
Everything ESP ESP8266 ESP-01
×1
Power Tail II
×1
00114 05
SparkFun Breadboard Power Supply 5V/3.3V
Any 3.3v power source will work.
×1
09873 01a
SparkFun FTDI Basic Breakout - 3.3V
Required to Program ESP8266
×1
12002 04
Breadboard (generic)
×1
Omron b3f 1000 image 75px
SparkFun Pushbutton switch 12mm
×2
E switch eg1218 image 75px
Slide Switch
×1
11026 02
Jumper wires (generic)
×1
Mfr 25frf52 1k sml
Resistor 1k ohm
×3
ESP8266 Breadboard Adapter
Optional* Makes working with ESP8266 and breadboard much easier.
×1
Software apps and online services:
Ide web
Arduino IDE
Gawd2jnp51w1h1ccsulo
IFTTT Amazon Alexa service
IFTTT - Adafruit
Adafruit IO

Schematics

Breadboard Setup
Picture of rough layout using breadboard
20170313 195107 hk3i6bfi43
Schematic Image
PNG File of Fritzing Schematic
Schematic 0cspvk8bfx
Fritzing Schematic
This diagram shows how to connect the ESP8266 to a regulated 3.3v power source and to an FTDI programmer. The Red LED represents whatever you want to drive with a 3.3v digital pin.
dohicky_id3o0ij6YS.fzz

Code

ESP8266/Arduino CodeArduino
This .ino file must be uploaded to ESP8266 using Arduino IDE. Detailed instructions can be found @ https://learn.adafruit.com/adafruit-huzzah-esp8266-breakout/using-arduino-ide
/***************************************************
  Adafruit MQTT Library ESP8266 Example
  Must use ESP8266 Arduino from:
    https://github.com/esp8266/Arduino
  Works great with Adafruit's Huzzah ESP board & Feather
  ----> https://www.adafruit.com/product/2471
  ----> https://www.adafruit.com/products/2821
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!
  Written by Tony DiCola for Adafruit Industries.
  MIT license, all text above must be included in any redistribution
 ****************************************************/
#include <ESP8266WiFi.h>
#include "Adafruit_MQTT.h"
#include "Adafruit_MQTT_Client.h"

// the OnOff button feed turns this RELAY on/off
#define RELAY 2  // EPS8266 GPIO2

/************************* WiFi Access Point *********************************/

#define WLAN_SSID       "<your ssid>"
#define WLAN_PASS       "<your passwd>"

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER      "io.adafruit.com"
#define AIO_SERVERPORT  8883                   // 1883 for http 8883 for https
#define AIO_USERNAME    "<user name>"
#define AIO_KEY         "<your aio key>"

/************ Global State (you don't need to change this!) ******************/

// Create an ESP8266 WiFiClient class to connect to the MQTT server.
//WiFiClient client;  // Must set AIO_SERVERPORT to 1883
// or... use WiFiFlientSecure for SSL
WiFiClientSecure client;  // Must set AIO_SERVERPORT to 8883

// Setup the MQTT client class by passing in the WiFi client and MQTT server and login details.
Adafruit_MQTT_Client mqtt(&client, AIO_SERVER, AIO_SERVERPORT, AIO_USERNAME, AIO_USERNAME, AIO_KEY);

/****************************** Feeds ***************************************/

// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
Adafruit_MQTT_Subscribe OnOffbutton = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/onoff");

/*************************** Sketch Code ************************************/

// Bug workaround for Arduino 1.6.6, it seems to need a function declaration
// for some reason (only affects ESP8266, likely an arduino-builder bug).
void MQTT_connect();

void setup() {
  pinMode(RELAY, OUTPUT);

  Serial.begin(115200);
  delay(10);

  Serial.println(F("Adafruit MQTT demo"));

  // Connect to WiFi access point.
  Serial.println(); Serial.println();
  Serial.print("Connecting to ");
  Serial.println(WLAN_SSID);

  WiFi.begin(WLAN_SSID, WLAN_PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();

  Serial.println("WiFi connected");
  Serial.println("IP address: "); Serial.println(WiFi.localIP());

  // Setup MQTT subscription for OnOff feed.
  mqtt.subscribe(&OnOffbutton);
}

uint32_t x=0;

void loop() {
  // Ensure the connection to the MQTT server is alive (this will make the first
  // connection and automatically reconnect when disconnected).  See the MQTT_connect
  // function definition further below.
  MQTT_connect();

  // this is our 'wait for incoming subscription packets' busy subloop
  // try to spend your time here

  Adafruit_MQTT_Subscribe *subscription;
  while ((subscription = mqtt.readSubscription(5000))) {
    // Check if its the OnOff button feed
    if (subscription == &OnOffbutton) {
      Serial.print(F("On-Off button: "));
      Serial.println((char *)OnOffbutton.lastread);
      
      if (strcmp((char *)OnOffbutton.lastread, "0") == 0) {
        digitalWrite(RELAY, LOW); 
      }
      if (strcmp((char *)OnOffbutton.lastread, "1") == 0) {
        digitalWrite(RELAY, HIGH); 
      }
    }
  }

  // ping the server to keep the mqtt connection alive
  if(! mqtt.ping()) {
    mqtt.disconnect();
  }

}

// Function to connect and reconnect as necessary to the MQTT server.
// Should be called in the loop function and it will take care if connecting.
void MQTT_connect() {
  int8_t ret;

  // Stop if already connected.
  if (mqtt.connected()) {
    return;
  }

  Serial.print("Connecting to MQTT... ");

  uint8_t retries = 3;
  while ((ret = mqtt.connect()) != 0) { // connect will return 0 for connected
       Serial.println(mqtt.connectErrorString(ret));
       Serial.println("Retrying MQTT connection in 5 seconds...");
       mqtt.disconnect();
       delay(5000);  // wait 5 seconds
       retries--;
       if (retries == 0) {
         // basically die and wait for WDT to reset me
         while (1);
       }
  }
  Serial.println("MQTT Connected!");
}
Adafruit_MQTT_Library
Used to connect ESP8266 to Adafruit IO

Credits

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