ESP8266 touch switch board with voice control

#include <EspalexaDevice.h>
#ifdef ARDUINO_ARCH_ESP32
#include <WiFi.h>
#else
#include <ESP8266WiFi.h>
#endif
#include <Espalexa.h>
// define the GPIO connected with Relays
#define RelayPin1 16  //D0
#define RelayPin2 5  //D1
#define RelayPin3 4 //D2
#define RelayPin4 0 //D3


#define SwitchPin1 14   //D5  
#define SwitchPin2 12   //D6  
#define SwitchPin3 13   //D7
#define SwitchPin4 15   //D8



int toggleState_1 = 0; //integer to remember the toggle state for relay 1
int toggleState_2 = 0;//integer to remember the toggle state for relay 2
int toggleState_3 = 0;//integer to remember the toggle state for relay 3
int toggleState_4 = 0;//integer to remember the toggle state for relay 4


void relayOnOff(int relay) {

  switch (relay) {
    case 1:
      if (toggleState_1 == 0) {
        digitalWrite(RelayPin1, LOW); // turn off relay 1
        Serial.println("Device1 OFF");
        toggleState_1 = 1;
      }
      else {
        digitalWrite(RelayPin1, HIGH); // turn on relay 2
        Serial.println("Device1 ON");
        toggleState_1 = 0;
      }
      break;

    case 2:
      if (toggleState_2 == 0) {
        digitalWrite(RelayPin2, LOW); // turn off relay 3
        Serial.println("Device2 OFF");
        toggleState_2 = 1;
      }
      else {
        digitalWrite(RelayPin2, HIGH); // turn on relay 4
        Serial.println("Device2 ON");
        toggleState_2 = 0;
      }
      break;

    case 3:
      if (toggleState_3 == 0) {
        digitalWrite(RelayPin3, LOW); // turn off relay 1
        Serial.println("Device3 OFF");
        toggleState_3 = 1;
      }
      else {
        digitalWrite(RelayPin3, HIGH); // turn on relay 1
        Serial.println("Device3 ON");
        toggleState_3 = 0;
      }
      break;
    
    case 4:
      if (toggleState_4 == 0) {
        digitalWrite(RelayPin4, LOW); // turn off relay 1
        Serial.println("Device4 OFF");
        toggleState_4 = 1;
      }
      else {
        digitalWrite(RelayPin4, HIGH); // turn on relay 1
        Serial.println("Device4 ON");
        toggleState_4 = 0;
      }
      break;

    default : break;
  }
}




void manual_control() {
  //Manual Switch Control
  if (digitalRead(SwitchPin1) == HIGH) {
    relayOnOff(1);
  }
  if (digitalRead(SwitchPin2) == HIGH) {
    relayOnOff(2);
  }
  if (digitalRead(SwitchPin3) == HIGH) {
    relayOnOff(3);
  }
  if (digitalRead(SwitchPin4) == HIGH) {
    relayOnOff(4);
  }
  
}


// prototypes
boolean connectWifi();

//callback functions
void firstLightChanged(uint8_t brightness);
void secondLightChanged(uint8_t brightness);
void thirdLightChanged(uint8_t brightness);
void fourthLightChanged(uint8_t brightness);

// WiFi Credentials
const char* ssid = "type_your_ssid_here";
const char* password = "type_you_rpassword_here";

// device names
String Device_1_Name = "Room light";
String Device_2_Name = "Blue bulb";
String Device_3_Name = "Yellow bulb";
String Device_4_Name = "Red bulb";

boolean wifiConnected = false;

Espalexa espalexa;

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

  pinMode(RelayPin1, OUTPUT);//declariing pin as output pins
  pinMode(RelayPin2, OUTPUT);//
  pinMode(RelayPin3, OUTPUT);//
  pinMode(RelayPin4, OUTPUT);//
 
  pinMode(SwitchPin1, INPUT);//declaring pins as input pins
  pinMode(SwitchPin2, INPUT);
  pinMode(SwitchPin3, INPUT);
  pinMode(SwitchPin4, INPUT);
 
  // Initialise wifi connection

  
  wifiConnected = connectWifi();

  if (wifiConnected)
  {
    // Define your devices here.
    espalexa.addDevice(Device_1_Name, firstLightChanged); //simplest definition, default state off
    espalexa.addDevice(Device_2_Name, secondLightChanged);
    espalexa.addDevice(Device_3_Name, thirdLightChanged);
    espalexa.addDevice(Device_4_Name, fourthLightChanged);
   

    espalexa.begin();
  }
  
}

void loop()
{
  manual_control();
  espalexa.loop();
  delay(100);
}





















//our callback functions
void firstLightChanged(uint8_t brightness)
{
  //Control the device
  if (brightness == 255)
    {
      digitalWrite(RelayPin1, HIGH);
      Serial.println("Device1 ON");
      toggleState_1 = 0;
    }
  else
  {
    digitalWrite(RelayPin1, LOW);
    Serial.println("Device1 OFF");
    toggleState_1 = 1;
  }
}

void secondLightChanged(uint8_t brightness)
{
  //Control the device 
  if (brightness == 255)
    {
      digitalWrite(RelayPin2, HIGH);
      Serial.println("Device2 ON");
      toggleState_2 = 0;
    }
  else
  {
    digitalWrite(RelayPin2, LOW);
    Serial.println("Device2 OFF");
    toggleState_2 = 1;
  }
}

void thirdLightChanged(uint8_t brightness)
{
  //Control the device  
  if (brightness == 255)
    {
      digitalWrite(RelayPin3, HIGH);
      Serial.println("Device3 ON");
      toggleState_3 = 0;
    }
  else
  {
    digitalWrite(RelayPin3, LOW);
    Serial.println("Device3 OFF");
    toggleState_3 = 1;
  }
}

void fourthLightChanged(uint8_t brightness)
{
  //Control the device 
  if (brightness == 255)
    {
      digitalWrite(RelayPin4, HIGH);
      Serial.println("Device4 ON");
      toggleState_4 = 0;
    }
  else
  {
    digitalWrite(RelayPin4, LOW);
    Serial.println("Device4 OFF");
    toggleState_4 = 1;
  }
}















// connect to wifi  returns true if successful or false if not























boolean connectWifi()
{
  boolean state = true;
  int i = 0;

  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.println("");
  Serial.println("Connecting to WiFi");

  // Wait for connection
  Serial.print("Connecting...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
    if (i > 20) {
      state = false; break;
    }
    i++;
  }
  Serial.println("");
  if (state) {
    Serial.print("Connected to ");
    Serial.println(ssid);
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
  }
  else {
    Serial.println("Connection failed.");
  }
  return state;
}