Published April 13, 2021 © GPL3+

Blynk Home Automation with Multiple ESP32 & NodeMCU Network

Make IoT-based Smart Home Automation using Multiple ESP32 & NodeMCU network to control all the home appliances from the Switches & Blynk App

IntermediateFull instructions provided12 hours5,345

Blynk Home Automation with Multiple ESP32 & NodeMCU Network

Things used in this project

Hardware components

Espressif ESP32S

NodeMCU ESP8266 Breakout Board

Seeed Studio Grove - 2-Channel SPDT Relay

Software apps and online services

Arduino IDE

Blynk

Hand tools and fabrication machines

Soldering iron (generic)

Story

In this IoT project, I have shown how to make IoT-based Smart Home Automation using Multiple NodeMCU ESP32 network to control all the home appliances from the switches & Blynk App.

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If the internet is not available, then you can control the home appliances from manual switches. During the article, I have shown all the steps to make this smart home system.

This complete Home Automation system has the following features:

Connect multiple ESP32 and NodeMCUs with the same Blynk account.
Control home appliances with WiFi (Blynk App)
Control home appliances with manual switches.
Monitor real-time feedback in the Blynk App.
Control home appliances manually without internet.
You can connect any number of microcontrollers in this IoT network as per the requirements.

For each room, you just need a relay module & a microcontroller like ESP32 or NodeMCU to make this smart home project.

Required Components:

For each room, you just need an ESP32 or NodeMCU, relay module & switches to make this smart home project.

If you use ESP32 then you can use either a 4-channel or 8-channel relay module, but for the NodeMCU you have to use the 4-channel relay module.

Required Components for the PCB

1. Relays 5v (SPDT) (8 no)

2. BC547 Transistors (8 no)

3. PC817 Optocuplors (8 no)

4. 510-ohm 0.25-watt Resistor (8 no) (R1 - R8)

5. 1k 0.25-watt Resistors (10 no) (R9 - R18)

6. LED 5-mm (10 no)

7. 1N4007 Diodes (8 no) (D1 - D8)

8. Push Buttons (8 no)

9. Terminal Connectors

10. 5V DC supply

Required Software:

1. Arduino IDE

2. Blynk App

Circuit Diagram of the ESP32 Control Relays

The circuit is very simple, I have used the GPIO pins D23, D22, D21 & D19 to control the 4 relays.

And the GPIO pins D13, D12, D14 & D27 connected with switches to control the 4 relays manually.

I have used the INPUT_PULLUP function in Arduino IDE instead of using the pull-up resistors.

I have used a 5V mobile charger to supply the smart relay module.

Please take proper safety precautions while working with high voltage.

Circuit Diagram of the NodeMCU Control Relays

The circuit is very simple, I have used the GPIO pins D1, D2, D5 & D6 to control the 4 relays.

And the GPIO pins SD3, D3, D7 & RX connected with switches to control the 4 relays manually.

I have used the INPUT_PULLUP function in Arduino IDE instead of using the pull-up resistors.

I have used a 5V mobile charger to supply the smart relay module.

Multiple NodeMCU ESP8266 Network

Now if you have multiple rooms, then you can use either ESP32 or NodeMCU for each room and then repeat the same circuit for each room.

If you use ESP32 then you can use either a 4-channel or 8-channel relay module, but for the NodeMCU you have to use the 4-channel relay module.

There is no limitation on the number of ESP32 or NodeMCUs that can be connected. All microcontrollers will connect to the Blynk server using the same Authenticate Token.

So we can control each NodeMCU or ESP32 independently from Blynk App.

Control Relays With Internet Using Blynk

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If the ESP32 or NodeMCUs are connected with the WiFi, then you can control the home appliances from Blynk App.

You also use multiple smartphones to control the appliances with Blynk App. For that, you have to login same Blynk account from all the smartphones. In this way, all smartphones will be sink to the Blynk server.

You can control, monitor the real-time status of the relays from anywhere in the world with the Blynk App.

Control Relays Manually With Switches

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You can always control the appliances manually with switches.

If the WiFi connected. then you can also monitor the relay time status of each switch in the Blynk App.

Controlling Relays Without WiFi

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If the WiFi is not available, you can control the relays from the switches.

The NodeMCU will check for the WiFi after every 3 seconds. When the WiFi is available, the ESP32 or NodeMCU will automatically connect with the WiFi.

Configure the Blynk App for the Multiple NodeMCUs

1. Install the Blynk App from the Google play store or App store. Then create an account.

2. Sign In and Tap on the New Project.

3. Give the name to the project, select NodeMCU, Connection type will be WiFi. Then tap on Create.

4. Blynk will send an authentication token to the registered email id. Tap on OK.

**As we will use only virtual pins in this Blynk project, so we can control both ESP32 and NodeMCU with this Blynk project.

Add the Button Widgets in Blynk App to Control Relays

Then add 8 button widgets from the Widget Box to control the 8 relays.

Create buttons with V1, V2, V3, V4, V5, V6, V7, V8 pins to control the relays.

Select the Mode as Switch for all the buttons.

**Here I have used an active low Relay module, so to turn ON the relay we have to send “0” and “1” to turn OFF the relay.

I have used virtual pins V1, V2, V3, V4 to control the first relay module with ESP32 (Room-1).

And V5, V6, V7, V8 to control the second relay module with NodeMCU (Room-2)

I have explained all the details in the tutorial video.

Code for Blynk NodeMCU & ESP32 Home Automation

In the Tutorial video, I have explained all the steps to program the NodeMCU and ESP32 using Arduino IDE.

Before uploading the code you have to install the following boards in Arduino IDE

ESP8266 Board
ESP32 Board

Then install the following libraries

Blynk Library
AceButton Library

I have mentioned all the download links in the code.

Then enter the WiFi name, WiFi password & Blynk Auth Token in the code.

Enter the following WiFi credential and Authentication token in the code:

WiFi Name at “WiFi Name”
WiFi Password at “WiFi Password”
Auth Token sent by Blynk at “AUTH TOKEN“

To program NodeMCU select the “NodeMCU 1.0 ESP-12E” board and proper PORT. Then click on the upload button.

To program ESP32, select the “DOIT ESP32 DEVKIT V1” board and proper PORT. Then click on the upload button.

For each NodeMCU or ESP32, you have to change the virtual pins in the code. In this project for the ESP32, virtual pins will be V1, V2, V3, V4. And for the NodeMCU, virtual pins will be V5, V6, V7, V8.

And while programming, please don't connect both microcontrollers with the laptop at the same time.

PCBs for This Home Automation Project

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As I said, you can make this smart home system just by using the Relay module and ESP32 or NodeMCU.

But to make the circuit compact and give the project a professional look, you can use the PCBs for this project.

Designing the PCB

To make the circuit compact and give a professional look, I have designed the PCB after testing all the features of the smart relay module on the breadboard.

You can download the PCB Gerber file of this home automation project from the following link:

https://drive.google.com/uc?export=download&id=1Jx4D_DSV_ei1y0a82AbtxbsNhy8sjCmY

Order the PCB

After downloading the Garber file you can easily order the PCB

1. Visit https://jlcpcb.com/RHS and Sign in / Sign up

2. Click on the QUOTE NOW button.

3. Click on the "Add your Gerber file" button. Then browse and select the Gerber file you have downloaded.

Uploading the Gerber File and Set the Parameters

4. Set the required parameter like Quantity, PCB masking color, etc.

5. After selecting all the Parameters for PCB click on SAVE TO CART button.

Select Shipping Address and Payment Mode

6. Type the Shipping Address.

7. Select the Shipping Method suitable for you.

8. Submit the order and proceed with the payment.

You can also track your order from the JLCPCB order page.

My PCBs took 2 days to get manufactured and arrived within a week using the DHL delivery option.

PCBs were well packed and the quality was really good at this affordable price.

Solder All the Components on PCB

After that, I have soldered all the components as per the circuit diagram.

Then connect the NodeMCU board with the PCB.

Connect the Home Appliances

Connect the 4 home appliances with the relay module as per the circuit diagram. Please take proper safety precautions while working with high voltage.

Connect 5-volt DC supply with the PCB. (I have used my old mobile charger)

Control Appliances With Blynk App

Here I have used the ESP32 for room-1 and NodeMCUs for room-2 to control appliances for 2 rooms.

If you have 3-rooms, then you add one more ESP32 or NodeMCU in the IoT network.

Thus, you can connect multiple NodeMCU and ESP32 as per your requirement.

Finally!! the Smart Home system is ready

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Now you can control all the home appliances in a smart way.

I hope you have liked this home automation project. I have shared all the required information for this project. I will really appreciate it if you share your valuable feedback. Also if you have any queryplease write in the comment section. Thank you & Happy Learning.

Code

/**********************************************************************************
 *  TITLE: Blynk + Manual Switch control Relays using NodeMCU (Real time feedback + no WiFi control)
 *  Click on the following links to learn more. 
 *  YouTube Video: https://youtu.be/6yeHGnpKo0k
 *  Related Blog : https://iotcircuithub.com/esp8266-projects/
 *  by Tech StudyCell
 *  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 ESP8266 NodeMCU : https://github.com/esp8266/Arduino
 *
 *  Download the libraries 
 *  Blynk Library: https://github.com/blynkkk/blynk-library/releases/download/v0.6.1/Blynk_Release_v0.6.1.zip
 *  AceButton Library: https://github.com/bxparks/AceButton
 **********************************************************************************/

//#define BLYNK_PRINT Serial            
#include <BlynkSimpleEsp8266.h>
#include <AceButton.h>
using namespace ace_button;

// define the GPIO connected with Relays and switches
#define RelayPin1 5  //D1
#define RelayPin2 4  //D2
#define RelayPin3 14 //D5
#define RelayPin4 12 //D6

#define SwitchPin1 10  //SD3
#define SwitchPin2 D3   //D3 
#define SwitchPin3 13  //D7
#define SwitchPin4 3   //RX

#define wifiLed   16   //D0

//Change the virtual pins according the rooms
#define VPIN_BUTTON_1    V5
#define VPIN_BUTTON_2    V6
#define VPIN_BUTTON_3    V7 
#define VPIN_BUTTON_4    V8

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

int wifiFlag = 0;

ButtonConfig config1;
AceButton button1(&config1);
ButtonConfig config2;
AceButton button2(&config2);
ButtonConfig config3;
AceButton button3(&config3);
ButtonConfig config4;
AceButton button4(&config4);

void handleEvent1(AceButton*, uint8_t, uint8_t);
void handleEvent2(AceButton*, uint8_t, uint8_t);
void handleEvent3(AceButton*, uint8_t, uint8_t);
void handleEvent4(AceButton*, uint8_t, uint8_t);


#define AUTH "AUTH TOKEN"                 // You should get Auth Token in the Blynk App.  
#define WIFI_SSID "WIFI NAME"             //Enter Wifi Name
#define WIFI_PASS "WIFI PASSWORD"         //Enter wifi Password

BlynkTimer timer;

// When App button is pushed - switch the state

BLYNK_WRITE(VPIN_BUTTON_1) {
  toggleState_1 = param.asInt();
  digitalWrite(RelayPin1, toggleState_1);
}

BLYNK_WRITE(VPIN_BUTTON_2) {
  toggleState_2 = param.asInt();
  digitalWrite(RelayPin2, toggleState_2);
}

BLYNK_WRITE(VPIN_BUTTON_3) {
  toggleState_3 = param.asInt();
  digitalWrite(RelayPin3, toggleState_3);
}

BLYNK_WRITE(VPIN_BUTTON_4) {
  toggleState_4 = param.asInt();
  digitalWrite(RelayPin4, toggleState_4);
}

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

  bool isconnected = Blynk.connected();
  if (isconnected == false) {
    wifiFlag = 1;
    Serial.println("Blynk Not Connected");
  }
  if (isconnected == true) {
    wifiFlag = 0;
    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);
    Serial.println("Blynk Connected");
  }
}
void setup()
{
  Serial.begin(9600);

  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, HIGH);

  config1.setEventHandler(button1Handler);
  config2.setEventHandler(button2Handler);
  config3.setEventHandler(button3Handler);
  config4.setEventHandler(button4Handler);
  
  button1.init(SwitchPin1);
  button2.init(SwitchPin2);
  button3.init(SwitchPin3);
  button4.init(SwitchPin4);

  WiFi.begin(WIFI_SSID, WIFI_PASS);
  timer.setInterval(3000L, checkBlynkStatus); // check if Blynk server is connected every 3 seconds
  Blynk.config(AUTH);
  delay(1000);

  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);
}

void loop()
{  
  if (WiFi.status() != WL_CONNECTED)
  {
    //Serial.println("WiFi Not Connected");
    digitalWrite(wifiLed, HIGH);
  }
  else
  {
    //+Serial.println("WiFi Connected");
    digitalWrite(wifiLed, LOW); //Turn on WiFi LED
    Blynk.run();
  }

  timer.run(); // Initiates SimpleTimer

  button1.check();
  button2.check();
  button3.check();
  button4.check();
}

void button1Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT1");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_1 = 0;
      Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);   // Update Button Widget
      digitalWrite(RelayPin1, LOW);
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_1 = 1;
      Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);   // Update Button Widget
      digitalWrite(RelayPin1, HIGH);
      break;
  }
}

void button2Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT2");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_2 = 0;
      Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
      digitalWrite(RelayPin2, LOW);
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_2 = 1;
      Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
      digitalWrite(RelayPin2, HIGH);
      break;
  }
}

void button3Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT3");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_3 = 0;
      Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
      digitalWrite(RelayPin3, LOW);
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_3 = 1;
      Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
      digitalWrite(RelayPin3, HIGH);
      break;
  }
}

void button4Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT4");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_4 = 0;
      Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
      digitalWrite(RelayPin4, LOW);
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_4 = 1;
      Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
      digitalWrite(RelayPin4, HIGH);
      break;
  }
}

/**********************************************************************************
 *  TITLE: Blynk + Manual Switch control Relays using ESP32 (Real time feedback + no WiFi control)
 *  Click on the following links to learn more. 
 *  YouTube Video: https://youtu.be/6yeHGnpKo0k
 *  Related Blog : https://iotcircuithub.com/esp32-projects/
 *  by Tech StudyCell
 *  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: https://github.com/blynkkk/blynk-library/releases/download/v0.6.1/Blynk_Release_v0.6.1.zip
 *  AceButton Library: https://github.com/bxparks/AceButton
 **********************************************************************************/

//#define BLYNK_PRINT Serial            
#include <BlynkSimpleEsp32.h>
#include <AceButton.h>
using namespace ace_button;

// 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

//Change the virtual pins according the rooms
#define VPIN_BUTTON_1    V1 
#define VPIN_BUTTON_2    V2
#define VPIN_BUTTON_3    V3 
#define VPIN_BUTTON_4    V4

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

int wifiFlag = 0;

ButtonConfig config1;
AceButton button1(&config1);
ButtonConfig config2;
AceButton button2(&config2);
ButtonConfig config3;
AceButton button3(&config3);
ButtonConfig config4;
AceButton button4(&config4);

void handleEvent1(AceButton*, uint8_t, uint8_t);
void handleEvent2(AceButton*, uint8_t, uint8_t);
void handleEvent3(AceButton*, uint8_t, uint8_t);
void handleEvent4(AceButton*, uint8_t, uint8_t);


#define AUTH "AUTH TOKEN"                 // You should get Auth Token in the Blynk App.  
#define WIFI_SSID "WIFI NAME"             //Enter Wifi Name
#define WIFI_PASS "WIFI PASSWORD"         //Enter wifi Password

BlynkTimer timer;

// When App button is pushed - switch the state

BLYNK_WRITE(VPIN_BUTTON_1) {
  toggleState_1 = param.asInt();
  digitalWrite(RelayPin1, toggleState_1);
}

BLYNK_WRITE(VPIN_BUTTON_2) {
  toggleState_2 = param.asInt();
  digitalWrite(RelayPin2, toggleState_2);
}

BLYNK_WRITE(VPIN_BUTTON_3) {
  toggleState_3 = param.asInt();
  digitalWrite(RelayPin3, toggleState_3);
}

BLYNK_WRITE(VPIN_BUTTON_4) {
  toggleState_4 = param.asInt();
  digitalWrite(RelayPin4, toggleState_4);
}

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

  bool isconnected = Blynk.connected();
  if (isconnected == false) {
    wifiFlag = 1;
  }
  if (isconnected == true) {
    wifiFlag = 0;
    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);
  }
}
void setup()
{
  Serial.begin(9600);

  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, HIGH);

  config1.setEventHandler(button1Handler);
  config2.setEventHandler(button2Handler);
  config3.setEventHandler(button3Handler);
  config4.setEventHandler(button4Handler);
  
  button1.init(SwitchPin1);
  button2.init(SwitchPin2);
  button3.init(SwitchPin3);
  button4.init(SwitchPin4);

  WiFi.begin(WIFI_SSID, WIFI_PASS);
  timer.setInterval(3000L, checkBlynkStatus); // check if Blynk server is connected every 3 seconds
  Blynk.config(AUTH);
  delay(1000);

  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);
}

void loop()
{  
  if (WiFi.status() != WL_CONNECTED)
  {
    //Serial.println("WiFi Not Connected");
    digitalWrite(wifiLed, LOW);
  }
  else
  {
    //+Serial.println("WiFi Connected");
    digitalWrite(wifiLed, HIGH); //Turn on WiFi LED
    Blynk.run();
  }

  timer.run(); // Initiates SimpleTimer

  button1.check();
  button2.check();
  button3.check();
  button4.check();
}

void button1Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT1");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_1 = 0;
      Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);   // Update Button Widget
      digitalWrite(RelayPin1, LOW);
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_1 = 1;
      Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);   // Update Button Widget
      digitalWrite(RelayPin1, HIGH);
      break;
  }
}

void button2Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT2");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_2 = 0;
      Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
      digitalWrite(RelayPin2, LOW);
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_2 = 1;
      Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);
      digitalWrite(RelayPin2, HIGH);
      break;
  }
}

void button3Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT3");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_3 = 0;
      Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
      digitalWrite(RelayPin3, LOW);
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_3 = 1;
      Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);
      digitalWrite(RelayPin3, HIGH);
      break;
  }
}

void button4Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT4");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_4 = 0;
      Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
      digitalWrite(RelayPin4, LOW);
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_4 = 1;
      Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);
      digitalWrite(RelayPin4, HIGH);
      break;
  }
}

Credits

Subhajit

47 projects • 126 followers

I have studied Electrical Engineering. I do love to make different DIY electronics projects & share it on my YouTube channel Tech StudyCell.

Blynk Home Automation with Multiple ESP32 & NodeMCU Network

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Required Components:

Required Components for the PCB

Required Software:

Circuit Diagram of the ESP32 Control Relays

Circuit Diagram of the NodeMCU Control Relays

Multiple NodeMCU ESP8266 Network

Control Relays With Internet Using Blynk

Control Relays Manually With Switches

Controlling Relays Without WiFi

Configure the Blynk App for the Multiple NodeMCUs

Add the Button Widgets in Blynk App to Control Relays

Code for Blynk NodeMCU & ESP32 Home Automation

PCBs for This Home Automation Project

Designing the PCB

Order the PCB

Uploading the Gerber File and Set the Parameters

Select Shipping Address and Payment Mode

Solder All the Components on PCB

Connect the Home Appliances

Control Appliances With Blynk App

Finally!! the Smart Home system is ready

Schematics

Circuit for NodeMCU & Blynk Controlled Relay with Switch

Circuit for ESP32 & Blynk Controlled 4 Relays with Switch

Code

Code for multiple NodeMCUs controlled Relays with Blynk & Manual Switch

Code for multiple ESP32 controlled Relays with Blynk & Manual Switch

Credits

Subhajit

Comments

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Blynk Home Automation with Multiple ESP32 & NodeMCU Network

Blynk Home Automation with Multiple ESP32 & NodeMCU Network

Things used in this project

Hardware components

Software apps and online services

Hand tools and fabrication machines

Story

Required Components:

Required Components for the PCB

Required Software:

Circuit Diagram of the ESP32 Control Relays

Circuit Diagram of the NodeMCU Control Relays

Multiple NodeMCU ESP8266 Network

Control Relays With Internet Using Blynk

Control Relays Manually With Switches

Controlling Relays Without WiFi

Configure the Blynk App for the Multiple NodeMCUs

Add the Button Widgets in Blynk App to Control Relays

Code for Blynk NodeMCU & ESP32 Home Automation

PCBs for This Home Automation Project

Designing the PCB

Order the PCB

Uploading the Gerber File and Set the Parameters

Select Shipping Address and Payment Mode

Solder All the Components on PCB

Connect the Home Appliances

Control Appliances With Blynk App

Finally!! the Smart Home system is ready

Schematics

Circuit for NodeMCU & Blynk Controlled Relay with Switch

Circuit for ESP32 & Blynk Controlled 4 Relays with Switch

Code

Code for multiple NodeMCUs controlled Relays with Blynk & Manual Switch

Code for multiple ESP32 controlled Relays with Blynk & Manual Switch

Credits

Subhajit

Comments

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