/**********************************************************************************
  Smart Home Automation using ESP32 with Blynk 2.0 with Real time feedback + EEPROM + No WiFi Control
  -----------------------
  Website: https://iotprojectsideas.com/

    Preferences--> Aditional boards Manager URLs :
    https://dl.espressif.com/dl/package_esp32_index.json, http://arduino.esp8266.com/stable/package_esp8266com_index.json

    Download Board ESP32 : https://github.com/espressif/arduino-esp32

    Download the libraries
    Blynk Library (1.1.0):  https://github.com/blynkkk/blynk-library
    DHT Library (1.4.3): https://github.com/adafruit/DHT-sensor-library
 **********************************************************************************/

/* Fill-in your Template ID Device Name and Auth Token */
#define BLYNK_TEMPLATE_ID "TMPL6OA7yR-40"
#define BLYNK_TEMPLATE_NAME "ESP32 Smart Home"
#define BLYNK_AUTH_TOKEN "AE3kRXcsvScR95rIvNoZs1AJn7dTkxe4"


// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
#define WIFI_CHANNEL 6

//#define BLYNK_PRINT Serial
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <Preferences.h>
#include <DHT.h>

Preferences pref;

// define the GPIO connected with Relays and switches
#define RelayPin1 23  //D23
#define RelayPin2 22  //D22
#define RelayPin3 21  //D21
#define RelayPin4 19  //D19

#define SwitchPin1 13  //D13
#define SwitchPin2 12  //D12
#define SwitchPin3 14  //D14
#define SwitchPin4 27  //D27

#define wifiLed   2   //D2
#define DHTPIN 18 //D18  pin connected with DHT
#define LDR_PIN 39 // VN pin connected with LDR

//Change the virtual pins according yours
#define VPIN_BUTTON_1    V1
#define VPIN_BUTTON_2    V2
#define VPIN_BUTTON_3    V3
#define VPIN_BUTTON_4    V5
#define VPIN_BUTTON_C    V4
#define VPIN_TEMPERATURE V6
#define VPIN_HUMIDITY    V7
#define VPIN_LDR    V0

// Uncomment whatever type you're using!
#define DHTTYPE DHT11     // DHT 11
//#define DHTTYPE DHT22   // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21   // DHT 21, AM2301


// Relay State
bool toggleState_1 = LOW; //Define integer to remember the toggle state for relay 1
bool toggleState_2 = LOW; //Define integer to remember the toggle state for relay 2
bool toggleState_3 = LOW; //Define integer to remember the toggle state for relay 3
bool toggleState_4 = LOW; //Define integer to remember the toggle state for relay 4

// Switch State
bool SwitchState_1 = LOW;
bool SwitchState_2 = LOW;
bool SwitchState_3 = LOW;
bool SwitchState_4 = LOW;

float temperature1 = 0;
float humidity1   = 0;
float ldrVal = 0;
int wifiFlag = 0;

DHT dht(DHTPIN, DHTTYPE);

char auth[] = BLYNK_AUTH_TOKEN;

BlynkTimer timer;

// When App button is pushed - switch the state

BLYNK_WRITE(VPIN_BUTTON_1) {
  toggleState_1 = param.asInt();
  digitalWrite(RelayPin1, !toggleState_1);
  pref.putBool("Relay1", toggleState_1);
}

BLYNK_WRITE(VPIN_BUTTON_2) {
  toggleState_2 = param.asInt();
  digitalWrite(RelayPin2, !toggleState_2);
  pref.putBool("Relay2", toggleState_2);
}

BLYNK_WRITE(VPIN_BUTTON_3) {
  toggleState_3 = param.asInt();
  digitalWrite(RelayPin3, !toggleState_3);
  pref.putBool("Relay3", toggleState_3);
}

BLYNK_WRITE(VPIN_BUTTON_4) {
  toggleState_4 = param.asInt();
  digitalWrite(RelayPin4, !toggleState_4);
  pref.putBool("Relay4", toggleState_4);
}

BLYNK_WRITE(VPIN_BUTTON_C) {
  all_SwitchOff();
}

void checkBlynkStatus() { // called every 3 seconds by SimpleTimer

  bool isconnected = Blynk.connected();
  if (isconnected == false) {
    wifiFlag = 1;
    digitalWrite(wifiLed, LOW);
    Serial.println("Blynk Not Connected");
  }
  if (isconnected == true) {
    wifiFlag = 0;
    digitalWrite(wifiLed, HIGH);
    Serial.println("Blynk Connected");
  }
}

BLYNK_CONNECTED() {
  // update the latest state to the server
  Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);
  Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
  Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
  Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);

  Blynk.syncVirtual(VPIN_TEMPERATURE);
  Blynk.syncVirtual(VPIN_HUMIDITY);
  Blynk.syncVirtual(VPIN_LDR);
}

void readSensor() {
  ldrVal = map(analogRead(LDR_PIN), 400, 4200, 0, 100);
  Serial.print("LDR - "); Serial.println(ldrVal);
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit
  t = random(25, 30);
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  else {
    humidity1 = h;
    temperature1 = t;
    Serial.print("Temperature - "); Serial.println(t);
    Serial.print("Humidity - "); Serial.println(h);
  }
}

void sendSensor()
{
  readSensor();
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(VPIN_TEMPERATURE, temperature1);
  Blynk.virtualWrite(VPIN_HUMIDITY, humidity1);
  Blynk.virtualWrite(VPIN_LDR, ldrVal);
}

void manual_control()
{
  if (digitalRead(SwitchPin1) == LOW && SwitchState_1 == LOW) {
    digitalWrite(RelayPin1, LOW);
    toggleState_1 = HIGH;
    SwitchState_1 = HIGH;
    pref.putBool("Relay1", toggleState_1);
    Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);
    Serial.println("Switch-1 on");
  }
  if (digitalRead(SwitchPin1) == HIGH && SwitchState_1 == HIGH) {
    digitalWrite(RelayPin1, HIGH);
    toggleState_1 = LOW;
    SwitchState_1 = LOW;
    pref.putBool("Relay1", toggleState_1);
    Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);
    Serial.println("Switch-1 off");
  }
  if (digitalRead(SwitchPin2) == LOW && SwitchState_2 == LOW) {
    digitalWrite(RelayPin2, LOW);
    toggleState_2 = HIGH;
    SwitchState_2 = HIGH;
    pref.putBool("Relay2", toggleState_2);
    Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
    Serial.println("Switch-2 on");
  }
  if (digitalRead(SwitchPin2) == HIGH && SwitchState_2 == HIGH) {
    digitalWrite(RelayPin2, HIGH);
    toggleState_2 = LOW;
    SwitchState_2 = LOW;
    pref.putBool("Relay2", toggleState_2);
    Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
    Serial.println("Switch-2 off");
  }
  if (digitalRead(SwitchPin3) == LOW && SwitchState_3 == LOW) {
    digitalWrite(RelayPin3, LOW);
    toggleState_3 = HIGH;
    SwitchState_3 = HIGH;
    pref.putBool("Relay3", toggleState_3);
    Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
    Serial.println("Switch-3 on");
  }
  if (digitalRead(SwitchPin3) == HIGH && SwitchState_3 == HIGH) {
    digitalWrite(RelayPin3, HIGH);
    toggleState_3 = LOW;
    SwitchState_3 = LOW;
    pref.putBool("Relay3", toggleState_3);
    Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
    Serial.println("Switch-3 off");
  }
  if (digitalRead(SwitchPin4) == LOW && SwitchState_4 == LOW) {
    digitalWrite(RelayPin4, LOW);
    toggleState_4 = HIGH;
    SwitchState_4 = HIGH;
    pref.putBool("Relay4", toggleState_4);
    Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
    Serial.println("Switch-4 on");
  }
  if (digitalRead(SwitchPin4) == HIGH && SwitchState_4 == HIGH) {
    digitalWrite(RelayPin4, HIGH);
    toggleState_4 = LOW;
    SwitchState_4 = LOW;
    pref.putBool("Relay4", toggleState_4);
    Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
    Serial.println("Switch-4 off");
  }
}


void all_SwitchOff() {
  toggleState_1 = 0; digitalWrite(RelayPin1, HIGH); pref.putBool("Relay1", toggleState_1); Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1); delay(100);
  toggleState_2 = 0; digitalWrite(RelayPin2, HIGH); pref.putBool("Relay2", toggleState_2); Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2); delay(100);
  toggleState_3 = 0; digitalWrite(RelayPin3, HIGH); pref.putBool("Relay3", toggleState_3); Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3); delay(100);
  toggleState_4 = 0; digitalWrite(RelayPin4, HIGH); pref.putBool("Relay4", toggleState_4); Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4); delay(100);
  Blynk.virtualWrite(VPIN_TEMPERATURE, temperature1);
  Blynk.virtualWrite(VPIN_HUMIDITY, humidity1);
  Blynk.virtualWrite(VPIN_LDR, ldrVal);
}

void getRelayState()
{
  //Serial.println("reading data from NVS");
  toggleState_1 = pref.getBool("Relay1", 0);
  digitalWrite(RelayPin1, !toggleState_1);
  Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);
  delay(200);
  toggleState_2 = pref.getBool("Relay2", 0);
  digitalWrite(RelayPin2, !toggleState_2);
  Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
  delay(200);
  toggleState_3 = pref.getBool("Relay3", 0);
  digitalWrite(RelayPin3, !toggleState_3);
  Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
  delay(200);
  toggleState_4 = pref.getBool("Relay4", 0);
  digitalWrite(RelayPin4, !toggleState_4);
  Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
  delay(200);
}

void setup()
{
  Serial.begin(115200);;
  //Open namespace in read-write mode
  pref.begin("Relay_State", false);

  pinMode(RelayPin1, OUTPUT);
  pinMode(RelayPin2, OUTPUT);
  pinMode(RelayPin3, OUTPUT);
  pinMode(RelayPin4, OUTPUT);

  pinMode(wifiLed, OUTPUT);

  pinMode(SwitchPin1, INPUT_PULLUP);
  pinMode(SwitchPin2, INPUT_PULLUP);
  pinMode(SwitchPin3, INPUT_PULLUP);
  pinMode(SwitchPin4, INPUT_PULLUP);

  //During Starting all Relays should TURN OFF
  digitalWrite(RelayPin1, !toggleState_1);
  digitalWrite(RelayPin2, !toggleState_2);
  digitalWrite(RelayPin3, !toggleState_3);
  digitalWrite(RelayPin4, !toggleState_4);

  digitalWrite(wifiLed, LOW);

  dht.begin();    // Enabling DHT sensor

  WiFi.begin(ssid, pass);
  timer.setInterval(2000L, checkBlynkStatus); // check if Blynk server is connected every 2 seconds
  timer.setInterval(1000L, sendSensor); // Sending Sensor Data to Blynk Cloud every 1 second
  Blynk.config(auth);
  delay(1000);

  getRelayState(); //fetch data from NVS Flash Memory
  //  delay(1000);
}

void loop()
{
  Blynk.run();
  timer.run(); // Initiates SimpleTimer

  manual_control();
}