Internet and Manual Control HomeAutomation System with feedback using ESP32 & Blynk.

Internet and Manual Control HomeAutomation System with feedback using ESP32 & Blynk.

Components Requried

1. ESP32.

2. Highlink AC to DC Convertor(HLK- PM01).

3. 5V Relay.

4. BC547 npn Transistor.

5. IN4007 Diode.

6. Two pin Terminal Connector.

7. 1kohm & 10kohm Resistor.

8. Coustom Designed PCB. 

Connection of Switches & Bulbs

Connect all the bulb and switches as Shown in the Schematics below.

Code

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
BlynkTimer timer;


#define DEBUG_SW 0


#define S1 32
#define R1 15

#define S2 35
#define R2 2

#define S3 34
#define R3 4

#define S4 39
#define R4 22


#define LED1 26
#define LED2 25
#define LED3 27
#define Buzzer 21



int MODE = 0;


// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "xxxxxxxxxxxxxxxxxxxxxxx";
char pass[] = "xxxxxxxxxxxx";

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "xxxxxxxxxxxxxxxxxxxxxxxxxxxx";


int switch_ON_Flag1_previous_I = 0;
int switch_ON_Flag2_previous_I = 0;
int switch_ON_Flag3_previous_I = 0;
int switch_ON_Flag4_previous_I = 0;


BLYNK_WRITE(V1)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V1 to a variable
  digitalWrite(R1, pinValue);
  // process received value
}

BLYNK_WRITE(V2)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V2 to a variable
  digitalWrite(R2, pinValue);
  // process received value
}

BLYNK_WRITE(V3)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V3 to a variable
  digitalWrite(R3, pinValue);
  // process received value
}

BLYNK_WRITE(V4)
{
  int pinValue = param.asInt(); // assigning incoming value from pin V4 to a variable
  digitalWrite(R4, pinValue);
  // process received value
}

void with_internet()
{
  if (digitalRead(S1) == LOW)
  {
    if (switch_ON_Flag1_previous_I == 0 )
    {
      digitalWrite(R1, LOW);
      if (DEBUG_SW) Serial.println("Relay1- ON");
      Blynk.virtualWrite(V1, 0);
      switch_ON_Flag1_previous_I = 1;
    }
    if (DEBUG_SW) Serial.println("Switch1 -ON");

  }
  if (digitalRead(S1) == HIGH )
  {
    if (switch_ON_Flag1_previous_I == 1)
    {
      digitalWrite(R1, HIGH);
      if (DEBUG_SW) Serial.println("Relay1 OFF");
      Blynk.virtualWrite(V1, 1);
      switch_ON_Flag1_previous_I = 0;
    }
    if (DEBUG_SW)Serial.println("Switch1 OFF");
  }


  if (digitalRead(S2) == LOW)
  {
    if (switch_ON_Flag2_previous_I == 0 )
    {
      digitalWrite(R2, LOW);
      if (DEBUG_SW)  Serial.println("Relay2- ON");
      Blynk.virtualWrite(V2, 0);
      switch_ON_Flag2_previous_I = 1;
    }
    if (DEBUG_SW) Serial.println("Switch2 -ON");

  }
  if (digitalRead(S2) == HIGH )
  {
    if (switch_ON_Flag2_previous_I == 1)
    {
      digitalWrite(R2, HIGH);
      if (DEBUG_SW) Serial.println("Relay2 OFF");
      Blynk.virtualWrite(V2, 1);
      switch_ON_Flag2_previous_I = 0;
    }
    if (DEBUG_SW)Serial.println("Switch2 OFF");
    //delay(200);
  }

  if (digitalRead(S3) == LOW)
  {
    if (switch_ON_Flag3_previous_I == 0 )
    {
      digitalWrite(R3, LOW);
      if (DEBUG_SW) Serial.println("Relay3- ON");
      Blynk.virtualWrite(V3, 0);
      switch_ON_Flag3_previous_I = 1;
    }
    if (DEBUG_SW) Serial.println("Switch3 -ON");

  }
  if (digitalRead(S3) == HIGH )
  {
    if (switch_ON_Flag3_previous_I == 1)
    {
      digitalWrite(R3, HIGH);
      if (DEBUG_SW) Serial.println("Relay3 OFF");
      Blynk.virtualWrite(V3, 1);
      switch_ON_Flag3_previous_I = 0;
    }
    if (DEBUG_SW)Serial.println("Switch3 OFF");
    //delay(200);
  }

  if (digitalRead(S4) == LOW)
  {
    if (switch_ON_Flag4_previous_I == 0 )
    {
      digitalWrite(R4, LOW);
      if (DEBUG_SW) Serial.println("Relay4- ON");
      Blynk.virtualWrite(V4, 0);
      switch_ON_Flag4_previous_I = 1;
    }
    if (DEBUG_SW) Serial.println("Switch4 -ON");

  }
  if (digitalRead(S4) == HIGH )
  {
    if (switch_ON_Flag4_previous_I == 1)
    {
      digitalWrite(R4, HIGH);
      if (DEBUG_SW) Serial.println("Relay4 OFF");
      Blynk.virtualWrite(V4, 1);
      switch_ON_Flag4_previous_I = 0;
    }
    if (DEBUG_SW)Serial.println("Switch4 OFF");
    //delay(200);
  }



}

void without_internet()
{

  digitalWrite(R1, digitalRead(S1));
  digitalWrite(R2, digitalRead(S2));
  digitalWrite(R3, digitalRead(S3));
  digitalWrite(R4, digitalRead(S4));

}


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

  bool isconnected = Blynk.connected();
  if (isconnected == false) {
    MODE = 1;
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
  }
  if (isconnected == true) {
    MODE = 0;
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, HIGH);
    digitalWrite(LED3, HIGH);
  }
}

void setup()
{
  // Debug console
  if (DEBUG_SW) Serial.begin(9600);
  pinMode(S1, INPUT);
  pinMode(R1, OUTPUT);

  pinMode(S2, INPUT);
  pinMode(R2, OUTPUT);

  pinMode(S3, INPUT);
  pinMode(R3, OUTPUT);

  pinMode(S4, INPUT);
  pinMode(R4, OUTPUT);


  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
  pinMode(Buzzer, OUTPUT);

  digitalWrite(LED1, HIGH);
  delay(200);
  digitalWrite(LED2, HIGH);
  delay(200);
  digitalWrite(LED3, HIGH);
  delay(200);

  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED3, LOW);
  delay(500);

  digitalWrite(LED1, HIGH);
  delay(200);
  digitalWrite(LED2, HIGH);
  delay(200);
  digitalWrite(LED3, HIGH);
  delay(200);

  digitalWrite(LED1, LOW);
  digitalWrite(LED2, LOW);
  digitalWrite(LED3, LOW);
  //pinMode(MODE, INPUT);
  WiFi.begin(ssid, pass);
  timer.setInterval(3000L, checkBlynk); // check if connected to Blynk server every 3 seconds
  Blynk.config(auth);//, ssid, pass);

}

void loop()
{
  if (WiFi.status() != WL_CONNECTED)
  {
    if (DEBUG_SW) Serial.println("Not Connected");
  }
  else
  {
    if (DEBUG_SW) Serial.println(" Connected");
    Blynk.run();
  }

  timer.run(); // Initiates SimpleTimer
  if (MODE == 0)
    with_internet();
  else
    without_internet();
}

copy above code and after making modification upload in your esp32 board.

Video Tutorial.

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