Voice Controlled Switching Operations Using Amazon Echo Dot

This project enables the ease of access to use the electronic appliances of home like TV, Microwave oven etc just by voice command

IntermediateFull instructions provided5 hours1,122

Early Bird - US Based Project

2021 China-US Young Maker Competition

Voice Controlled Switching Operations Using Amazon Echo Dot

Things used in this project

Hardware components

NodeMCU ESP8266 Breakout Board

Amazon Alexa Echo Dot

Jumper wires (generic)

Breadboard (generic)

LED (generic)

Software apps and online services

Amazon Alexa Official Arduino Skill

Story

First the user has to speak for the specific device and the command will be like below

“Hey Alexa turn on device_name”

Here the device_name is the predefined name of the device to be determined by the user by which it is registered with the NodeMCU board.After the successful command Alexa will decode the device and sent it to the NodeMCU board and then the NodeMCU board will publish the command to turn on the specific device as said by the person

Here is the simple hardware connection for this project

Connections

1. D7 → LED +ve side2. GND → LED -ve side3. Vin → Battery +ve4. GND → Battery -ve

Here is a short video which explains the whole operation

Code

Arduino Code for the Project

#include <Arduino.h>
#include <ESP8266WiFi.h>
#include "fauxmoESP.h"

#define SERIAL_BAUDRATE     115200 //Serial baudrate

fauxmoESP fauxmo; //Declare fauxmoESP object

// Name virtual devices
const char* deviceZero="Hallway Light";

int ledPin = 13 ; //GPIO13 --- D7 of NodeMCU

#define WIFI_SSID "ANJALI VILLA NET" //Wifi SSID
#define WIFI_PASS "AYAN@445bi" //Wifi Password

void setup()
{

    // Init serial port
    Serial.begin(SERIAL_BAUDRATE);
    Serial.println();
    Serial.println();

    pinMode(ledPin,OUTPUT);
    digitalWrite(ledPin,LOW);
    
    Serial.println("Setting up wifi!");
    wifiSetup(); //Set up wifi

    //Setup fauxmo
    fauxmo.createServer(true); // not needed, this is the default value
    fauxmo.setPort(80); // This is required for gen3 devices
    fauxmo.enable(true);
    
    // Add virtual devices
    fauxmo.addDevice(deviceZero); //Add deviceZero
    fauxmo.onSetState(callback); //What function to execute when message is received
}

// Main Loop
void loop()
{
    // fauxmoESP uses an async TCP server but a sync UDP server
    // Therefore, we have to manually poll for UDP packets
    fauxmo.handle();
    delay(500);
}

// Device Callback
void callback(unsigned char device_id, const char * device_name, bool state, unsigned char value)
{   
    Serial.printf("[MAIN] Device #%d (%s) state: %s value: %d\n", device_id, device_name, state ? "ON" : "OFF", value);
    Serial.println(device_name);
    if (strcmp(device_name, deviceZero)==0)
    {
      if (state==1) //Turn LED on
      {
        digitalWrite(ledPin,HIGH);
        Serial.println("LED Turned on");
      }
      else //Turn LED off
      {
        digitalWrite(ledPin,LOW);
        Serial.println("LED Turned off");
      }
    }
    
}

//Pause Function
void pause(int pauseTime)
{
  Serial.println("Entering pause function!");
  unsigned long currentMillis = millis();
  long previousMillis = currentMillis;
  while ((currentMillis-previousMillis)<pauseTime/2)
  {
    //Serial.println("In pause loop!");
    currentMillis=millis();
  }
  ESP.wdtFeed();
  currentMillis = millis();
  previousMillis = currentMillis;
  while ((currentMillis-previousMillis)<pauseTime/2)
  {
    //Serial.println("In pause loop!");
    currentMillis=millis();
  }
  Serial.println("Exiting pause function!");
}

//Wifi Setup
void wifiSetup() 
{
    WiFi.mode(WIFI_STA); 
    wifi_set_sleep_type(LIGHT_SLEEP_T);

    // 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.print("Connected!");
    Serial.println();

    // Connected!
    Serial.printf("[WIFI] STATION Mode, SSID: %s, IP address: %s\n", WiFi.SSID().c_str(), WiFi.localIP().toString().c_str());
    Serial.println();

}