Subhajit
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WiFi + Bluetooth + Manual Switch control 8 relays with ESP32

Control 8 relays with WiFI + Bluetooth + Manual Switch using ESP32 and Blynk App. Explained with circuit & source code.

IntermediateFull instructions provided10 hours3,749
WiFi + Bluetooth + Manual Switch control 8 relays with ESP32

Things used in this project

Hardware components

FireBeetle ESP32 IOT Microcontroller (Supports Wi-Fi & Bluetooth)
DFRobot FireBeetle ESP32 IOT Microcontroller (Supports Wi-Fi & Bluetooth)
×1
Grove - 2-Channel SPDT Relay
Seeed Grove - 2-Channel SPDT Relay
×1

Software apps and online services

Arduino IDE
Arduino IDE
Blynk
Blynk

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)

Story

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Schematics

Circuit for ESP32 WiFi Bluetooth control relays with Manual Switch

Circuit for ESP32 WiFi Bluetooth control relays with Manual Switch

Code

Code for ESP32 WiFi Bluetooth control relays with Manual Switch

Arduino
Code for ESP32 WiFi Bluetooth control relays with Manual Switch
  /**********************************************************************************
 *  TITLE: WiFi + Bluetooth + Manual (Switch) control 8 relays using ESP32 & Blynk | Realtime Feedback |
 *  Click on the following links to learn more. 
 *  YouTube Video: https://youtu.be/ifKMi-3uf9Q
 *  Related Blog : https://iotcircuithub.com/esp32-projects/
 *  by Subhajit (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
 *  BluetoothSerial: https://github.com/espressif/arduino-esp32/tree/master/libraries/BluetoothSerial
 *  AceButton Library: https://github.com/bxparks/AceButton
 *  Blynk library  : https://github.com/blynkkk/blynk-library/releases/latest
 *  Install the libraries at Arduino IDE -> Sketch - Include Library -> Add Zip Library
 **********************************************************************************/

#include <BlynkSimpleEsp32.h>
#include "BluetoothSerial.h" 
#include <AceButton.h>
using namespace ace_button;


#if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED)
#error Bluetooth is not enabled! Please run
`make menuconfig` to and enable it
#endif

BluetoothSerial SerialBT;

BlynkTimer timer;

// 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 RelayPin5 18  //D18
#define RelayPin6 5   //D5
#define RelayPin7 25  //D25
#define RelayPin8 26  //D26

#define SwitchPin1 13  //D13
#define SwitchPin2 12  //D12
#define SwitchPin3 14  //D14
#define SwitchPin4 27  //D27
#define SwitchPin5 33  //D33
#define SwitchPin6 32  //D32
#define SwitchPin7 15  //D15
#define SwitchPin8 4   //D4

#define wifiLed    2   //D2

#define VPIN_BUTTON_1    V1 
#define VPIN_BUTTON_2    V2
#define VPIN_BUTTON_3    V3 
#define VPIN_BUTTON_4    V4
#define VPIN_BUTTON_5    V5 
#define VPIN_BUTTON_6    V6
#define VPIN_BUTTON_7    V7 
#define VPIN_BUTTON_8    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 toggleState_5 = 1; //Define integer to remember the toggle state for relay 5
int toggleState_6 = 1; //Define integer to remember the toggle state for relay 6
int toggleState_7 = 1; //Define integer to remember the toggle state for relay 7
int toggleState_8 = 1; //Define integer to remember the toggle state for relay 8

int wifiFlag = 0;
char bt_data; // variable for storing bluetooth data 

ButtonConfig config1;
AceButton button1(&config1);
ButtonConfig config2;
AceButton button2(&config2);
ButtonConfig config3;
AceButton button3(&config3);
ButtonConfig config4;
AceButton button4(&config4);
ButtonConfig config5;
AceButton button5(&config5);
ButtonConfig config6;
AceButton button6(&config6);
ButtonConfig config7;
AceButton button7(&config7);
ButtonConfig config8;
AceButton button8(&config8);

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);
void handleEvent5(AceButton*, uint8_t, uint8_t);
void handleEvent6(AceButton*, uint8_t, uint8_t);
void handleEvent7(AceButton*, uint8_t, uint8_t);
void handleEvent8(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

// 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);
}

BLYNK_WRITE(VPIN_BUTTON_5) {
  toggleState_5 = param.asInt();
  digitalWrite(RelayPin5, toggleState_5);
}

BLYNK_WRITE(VPIN_BUTTON_6) {
  toggleState_6 = param.asInt();
  digitalWrite(RelayPin6, toggleState_6);
}

BLYNK_WRITE(VPIN_BUTTON_7) {
  toggleState_7 = param.asInt();
  digitalWrite(RelayPin7, toggleState_7);
}

BLYNK_WRITE(VPIN_BUTTON_8) {
  toggleState_8 = param.asInt();
  digitalWrite(RelayPin8, toggleState_8);
}

BLYNK_CONNECTED() {
  // Request the latest state from the server
  Blynk.syncVirtual(VPIN_BUTTON_1);
  Blynk.syncVirtual(VPIN_BUTTON_2);
  Blynk.syncVirtual(VPIN_BUTTON_3);
  Blynk.syncVirtual(VPIN_BUTTON_4);
  Blynk.syncVirtual(VPIN_BUTTON_5);
  Blynk.syncVirtual(VPIN_BUTTON_6);
  Blynk.syncVirtual(VPIN_BUTTON_7);
  Blynk.syncVirtual(VPIN_BUTTON_8);
}


void all_Switch_ON(){
  digitalWrite(RelayPin1, LOW); toggleState_1 = 0; delay(100);
  digitalWrite(RelayPin2, LOW); toggleState_2 = 0; delay(100);
  digitalWrite(RelayPin3, LOW); toggleState_3 = 0; delay(100);
  digitalWrite(RelayPin4, LOW); toggleState_4 = 0; delay(100);
  digitalWrite(RelayPin5, LOW); toggleState_5 = 0; delay(100);
  digitalWrite(RelayPin6, LOW); toggleState_6 = 0; delay(100);
  digitalWrite(RelayPin7, LOW); toggleState_7 = 0; delay(100);
  digitalWrite(RelayPin8, LOW); toggleState_8 = 0; delay(100);
}

void all_Switch_OFF(){
  digitalWrite(RelayPin1, HIGH); toggleState_1 = 1; delay(100);
  digitalWrite(RelayPin2, HIGH); toggleState_2 = 1; delay(100);
  digitalWrite(RelayPin3, HIGH); toggleState_3 = 1; delay(100);
  digitalWrite(RelayPin4, HIGH); toggleState_4 = 1; delay(100);
  digitalWrite(RelayPin5, HIGH); toggleState_5 = 1; delay(100);
  digitalWrite(RelayPin6, HIGH); toggleState_6 = 1; delay(100);
  digitalWrite(RelayPin7, HIGH); toggleState_7 = 1; delay(100);
  digitalWrite(RelayPin8, HIGH); toggleState_8 = 1; delay(100);
}

void Bluetooth_handle()
{
  bt_data = SerialBT.read();
//  Serial.println(bt_data);
  delay(20);

  switch(bt_data)
      {
        case 'A': digitalWrite(RelayPin1, LOW);  toggleState_1 = 0; break; // if 'A' received Turn on Relay1
        case 'a': digitalWrite(RelayPin1, HIGH); toggleState_1 = 1; break; // if 'a' received Turn off Relay1
        case 'B': digitalWrite(RelayPin2, LOW);  toggleState_2 = 0; break; // if 'B' received Turn on Relay2
        case 'b': digitalWrite(RelayPin2, HIGH); toggleState_2 = 1; break; // if 'b' received Turn off Relay2
        case 'C': digitalWrite(RelayPin3, LOW);  toggleState_3 = 0; break; // if 'C' received Turn on Relay3
        case 'c': digitalWrite(RelayPin3, HIGH); toggleState_3 = 1; break; // if 'c' received Turn off Relay3
        case 'D': digitalWrite(RelayPin4, LOW);  toggleState_4 = 0; break; // if 'D' received Turn on Relay4
        case 'd': digitalWrite(RelayPin4, HIGH); toggleState_4 = 1; break; // if 'd' received Turn off Relay4
        case 'E': digitalWrite(RelayPin5, LOW);  toggleState_5 = 0; break; // if 'E' received Turn on Relay5
        case 'e': digitalWrite(RelayPin5, HIGH); toggleState_5 = 1; break; // if 'e' received Turn off Relay5
        case 'F': digitalWrite(RelayPin6, LOW);  toggleState_6 = 0; break; // if 'F' received Turn on Relay6
        case 'f': digitalWrite(RelayPin6, HIGH); toggleState_6 = 1; break; // if 'f' received Turn off Relay6
        case 'G': digitalWrite(RelayPin7, LOW);  toggleState_7 = 0; break; // if 'G' received Turn on Relay7
        case 'g': digitalWrite(RelayPin7, HIGH); toggleState_7 = 1; break; // if 'g' received Turn off Relay7
        case 'H': digitalWrite(RelayPin8, LOW);  toggleState_8 = 0; break; // if 'H' received Turn on Relay8
        case 'h': digitalWrite(RelayPin8, HIGH); toggleState_8 = 1; break; // if 'h' received Turn off Relay8
        case 'Z': all_Switch_ON(); break;  // if 'Z' received Turn on all Relays
        case 'z': all_Switch_OFF(); break; // if 'z' received Turn off all Relays
        default : break;
      }
}

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

  bool isconnected = Blynk.connected();
  if (isconnected == false) {
    wifiFlag = 1;
    digitalWrite(wifiLed, LOW); //Turn off WiFi LED
  }
  if (isconnected == true) {
    wifiFlag = 0;
    digitalWrite(wifiLed, HIGH); //Turn on WiFi LED
  }
}

void setup()
{
  Serial.begin(9600);

  btStart();  //Serial.println("Bluetooth On");
  
  SerialBT.begin("ESP32_BT"); //Bluetooth device name
  Serial.println("The device started, now you can pair it with bluetooth!");
  delay(5000);

  pinMode(RelayPin1, OUTPUT);
  pinMode(RelayPin2, OUTPUT);
  pinMode(RelayPin3, OUTPUT);
  pinMode(RelayPin4, OUTPUT);
  pinMode(RelayPin5, OUTPUT);
  pinMode(RelayPin6, OUTPUT);
  pinMode(RelayPin7, OUTPUT);
  pinMode(RelayPin8, OUTPUT);

  pinMode(wifiLed, OUTPUT);

  pinMode(SwitchPin1, INPUT_PULLUP);
  pinMode(SwitchPin2, INPUT_PULLUP);
  pinMode(SwitchPin3, INPUT_PULLUP);
  pinMode(SwitchPin4, INPUT_PULLUP);
  pinMode(SwitchPin5, INPUT_PULLUP);
  pinMode(SwitchPin6, INPUT_PULLUP);
  pinMode(SwitchPin7, INPUT_PULLUP);
  pinMode(SwitchPin8, 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(RelayPin5, toggleState_5);
  digitalWrite(RelayPin6, toggleState_6);
  digitalWrite(RelayPin7, toggleState_7);
  digitalWrite(RelayPin8, toggleState_8);

  config1.setEventHandler(button1Handler);
  config2.setEventHandler(button2Handler);
  config3.setEventHandler(button3Handler);
  config4.setEventHandler(button4Handler);
  config5.setEventHandler(button5Handler);
  config6.setEventHandler(button6Handler);
  config7.setEventHandler(button7Handler);
  config8.setEventHandler(button8Handler);

  button1.init(SwitchPin1);
  button2.init(SwitchPin2);
  button3.init(SwitchPin3);
  button4.init(SwitchPin4);
  button5.init(SwitchPin5);
  button6.init(SwitchPin6);
  button7.init(SwitchPin7);
  button8.init(SwitchPin8);

  WiFi.begin(WIFI_SSID, WIFI_PASS);
  timer.setInterval(3000L, checkBlynkStatus); // check if Blynk server is connected every 3 seconds
  Blynk.config(AUTH);
  delay(2000);
}

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

  timer.run(); // Initiates SimpleTimer
  if (wifiFlag == 0){
    }
  else{
    if (SerialBT.available()){
      Bluetooth_handle();
    }
  } 

  button1.check();
  button2.check();
  button3.check();
  button4.check();
  button5.check();
  button6.check();
  button7.check();
  button8.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;
      digitalWrite(RelayPin1, LOW);
      Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);   // Update Button Widget  
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_1 = 1;
      digitalWrite(RelayPin1, HIGH);
      Blynk.virtualWrite(VPIN_BUTTON_1, toggleState_1);   // Update Button Widget  
      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;
      digitalWrite(RelayPin2, LOW);
      Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);   // Update Button Widget  
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_2 = 1;
      digitalWrite(RelayPin2, HIGH);
      Blynk.virtualWrite(VPIN_BUTTON_2, toggleState_2);   // Update Button Widget  
      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;
      digitalWrite(RelayPin3, LOW);
      Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);   // Update Button Widget  
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_3 = 1;
      digitalWrite(RelayPin3, HIGH);
      Blynk.virtualWrite(VPIN_BUTTON_3, toggleState_3);   // Update Button Widget  
      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;
      digitalWrite(RelayPin4, LOW);
      Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);   // Update Button Widget  
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_4 = 1;
      digitalWrite(RelayPin4, HIGH);
      Blynk.virtualWrite(VPIN_BUTTON_4, toggleState_4);   // Update Button Widget  
      break;
  }
}

void button5Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT5");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_5 = 0;
      digitalWrite(RelayPin5, LOW);
      Blynk.virtualWrite(VPIN_BUTTON_5, toggleState_5);   // Update Button Widget  
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_5 = 1;
      digitalWrite(RelayPin5, HIGH);
      Blynk.virtualWrite(VPIN_BUTTON_5, toggleState_5);   // Update Button Widget  
      break;
  }
}

void button6Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT6");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_6 = 0;
      digitalWrite(RelayPin6, LOW);
      Blynk.virtualWrite(VPIN_BUTTON_6, toggleState_6);   // Update Button Widget  
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_6 = 1;
      digitalWrite(RelayPin6, HIGH);
      Blynk.virtualWrite(VPIN_BUTTON_6, toggleState_6);   // Update Button Widget  
      break;
  }
}

void button7Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT7");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_7 = 0;
      digitalWrite(RelayPin7, LOW);
      Blynk.virtualWrite(VPIN_BUTTON_7, toggleState_7);   // Update Button Widget  
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_7 = 1;
      digitalWrite(RelayPin7, HIGH);
      Blynk.virtualWrite(VPIN_BUTTON_7, toggleState_7);   // Update Button Widget  
      break;
  }
}

void button8Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) {
  Serial.println("EVENT8");
  switch (eventType) {
    case AceButton::kEventPressed:
      Serial.println("kEventPressed");
      toggleState_8 = 0;
      digitalWrite(RelayPin8, LOW);
      Blynk.virtualWrite(VPIN_BUTTON_8, toggleState_8);   // Update Button Widget  
      break;
    case AceButton::kEventReleased:
      Serial.println("kEventReleased");
      toggleState_8 = 1;
      digitalWrite(RelayPin8, HIGH);
      Blynk.virtualWrite(VPIN_BUTTON_8, toggleState_8);   // Update Button Widget  
      break;
  }
}

Credits

Subhajit

Subhajit

25 projects • 43 followers
I have studied Electrical Engineering. I do love to make different DIY electronics projects & share it on my YouTube channel Tech StudyCell.

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