esp32 blynk home automation

The world of home automation has been revolutionized by the advent of the ESP32 microcontroller, which offers a powerful and flexible platform for controlling a wide range of devices. By pairing the ESP32 with the Blynk app, you can easily create a home automation system that can be controlled remotely using your smartphone or tablet.

One of the key advantages of using the ESP32 for home automation is its ability to integrate with a range of different input methods. For example, you can use an IR remote control to send commands to the ESP32, allowing you to turn lights on and off,. Alternatively, you can use manual switches to control your devices, or even trigger them based on certain conditions or 

To get started with ESP32 home automation, you will need the following components:

quartaz components links :

• An ESP32 development board      buy-now

• A relay module         buy-now

• An IR receiver module   buynow

• wires    buy-now

• breadboard    buy-now

amazon links :

• An ESP32 development board      buy-now

• A relay module         buy-now

• An IR receiver module   buynow

• wires    buy-now

• breadboard    buy-now

 esp32 blynk home automation circuit:

esp32 blynk home automation  code :

#define BLYNK_TEMPLATE_ID "TMPLp8VI_eJ2" #define BLYNK_TEMPLATE_NAME "HOME" #define BLYNK_AUTH_TOKEN "tHAV-gsdfgfdgsgSJxmT" #define BLYNK_PRINT Serial #include <WiFi.h> #include <Blynk.h> #include <BlynkSimpleEsp32.h> #include <Preferences.h> #include <IRremote.h> #include <AceButton.h> using namespace ace_button; Preferences preference; char ssid[] = "mewt"; char pass[] = "87654321"; #define ir_remote_switch1 0xC00001 #define ir_remote_switch2 0xC00002 #define ir_remote_switch3 0xC00003 #define ir_remote_switch4 0xC00004 #define IR_All_On 0xC00005 #define IR_All_Off 0xC00006 // define the GPIO connected with Relays and switches #define relay1 23 //D23 #define relay2 22 //D22 #define relay3 21 //D21 #define relay4 19 //D19 #define switch1 13 //D13 #define switch2 12 //D12 #define switch3 14 //D14 #define switch4 27 //D27 #define IR_RECV_PIN 35 // D35 (IR receiver pin) //Change the virtual pins according the rooms #define virtual_pin1 V0 #define virtual_pin2 V1 #define virtual_pin3 V2 #define virtual_pin4 V3 #define virtual_pinA V4 #define virtual_pinB V5 // Relay State bool state1 = LOW; //Define integer to remember the toggle state for relay 1 bool state2 = LOW; //Define integer to remember the toggle state for relay 2 bool state3 = LOW; //Define integer to remember the toggle state for relay 3 bool state4 = LOW; //Define integer to remember the toggle state for relay 4 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); IRrecv irrecv(IR_RECV_PIN); decode_results results; bool first_run = true; int wifiFlag = 0; char auth[] = BLYNK_AUTH_TOKEN; BlynkTimer timer; // When App button is pushed - switch the state BLYNK_WRITE(virtual_pin1) { state1 = param.asInt(); digitalWrite(relay1, !state1); preference.putBool("Relay1", state1); } BLYNK_WRITE(virtual_pin2) { state2 = param.asInt(); digitalWrite(relay2, !state2); preference.putBool("Relay2", state2); } BLYNK_WRITE(virtual_pin3) { state3 = param.asInt(); digitalWrite(relay3, !state3); preference.putBool("Relay3", state3); } BLYNK_WRITE(virtual_pin4) { state4 = param.asInt(); digitalWrite(relay4, !state4); preference.putBool("Relay4", state4); } BLYNK_WRITE(virtual_pinA) { all_SwitchOn(); } BLYNK_WRITE(virtual_pinB) { all_SwitchOff(); } void ir_remote(){ if (irrecv.decode(&results)) { switch(results.value){ case ir_remote_switch1: digitalWrite(relay1, state1); state1 = !state1; preference.putBool("Relay1", state1); Blynk.virtualWrite(virtual_pin1, state1); delay(100); break; case ir_remote_switch2: digitalWrite(relay2, state2); state2 = !state2; preference.putBool("Relay2", state2); Blynk.virtualWrite(virtual_pin2, state2); delay(100); break; case ir_remote_switch3: digitalWrite(relay3, state3); state3 = !state3; preference.putBool("Relay3", state3); Blynk.virtualWrite(virtual_pin3, state3); delay(100); break; case ir_remote_switch4: digitalWrite(relay4, state4); state4 = !state4; preference.putBool("Relay4", state4); Blynk.virtualWrite(virtual_pin4, state4); delay(100); break; case IR_All_Off: all_SwitchOff(); break; case IR_All_On: all_SwitchOn(); break; default : break; } //Serial.println(results.value, HEX); irrecv.resume(); } } void all_SwitchOn(){ state1 = 1; digitalWrite(relay1, LOW); preference.putBool("Relay1", state1); Blynk.virtualWrite(virtual_pin1, state1); delay(100); state2 = 1; digitalWrite(relay2, LOW); preference.putBool("Relay2", state2); Blynk.virtualWrite(virtual_pin2, state2); delay(100); state3 = 1; digitalWrite(relay3, LOW); preference.putBool("Relay3", state3); Blynk.virtualWrite(virtual_pin3, state3); delay(100); state4 = 1; digitalWrite(relay4, LOW); preference.putBool("Relay4", state4); Blynk.virtualWrite(virtual_pin4, state4); delay(100); } void all_SwitchOff(){ state1 = 0; digitalWrite(relay1, HIGH); preference.putBool("Relay1", state1); Blynk.virtualWrite(virtual_pin1, state1); delay(100); state2 = 0; digitalWrite(relay2, HIGH); preference.putBool("Relay2", state2); Blynk.virtualWrite(virtual_pin2, state2); delay(100); state3 = 0; digitalWrite(relay3, HIGH); preference.putBool("Relay3", state3); Blynk.virtualWrite(virtual_pin3, state3); delay(100); state4 = 0; digitalWrite(relay4, HIGH); preference.putBool("Relay4", state4); Blynk.virtualWrite(virtual_pin4, state4); delay(100); } void getRelayState() { //Serial.println("reading data from NVS"); state1 = preference.getBool("Relay1", 0); digitalWrite(relay1, !state1); Blynk.virtualWrite(virtual_pin1, state1); delay(200); state2 = preference.getBool("Relay2", 0); digitalWrite(relay2, !state2); Blynk.virtualWrite(virtual_pin2, state2); delay(200); state3 = preference.getBool("Relay3", 0); digitalWrite(relay3, !state3); Blynk.virtualWrite(virtual_pin3, state3); delay(200); state4 = preference.getBool("Relay4", 0); digitalWrite(relay4, !state4); Blynk.virtualWrite(virtual_pin4, state4); delay(200); } void setup() { Serial.begin(115200); //Open namespace in read-write mode preference.begin("Relay_State", false); pinMode(2, OUTPUT); pinMode(relay1, OUTPUT); pinMode(relay2, OUTPUT); pinMode(relay3, OUTPUT); pinMode(relay4, OUTPUT); pinMode(switch1, INPUT_PULLUP); pinMode(switch2, INPUT_PULLUP); pinMode(switch3, INPUT_PULLUP); pinMode(switch4, INPUT_PULLUP); //During Starting all Relays should TURN OFF digitalWrite(relay1, !state1); digitalWrite(relay2, !state2); digitalWrite(relay3, !state3); digitalWrite(relay4, !state4); config1.setEventHandler(button1Handler); config2.setEventHandler(button2Handler); config3.setEventHandler(button3Handler); config4.setEventHandler(button4Handler); button1.init(switch1); button2.init(switch2); button3.init(switch3); button4.init(switch4); irrecv.enableIRIn(); // Enabling IR sensor Blynk.begin(auth, ssid, pass); timer.setInterval(2000L, checkBlynkStatus); // check if Blynk server is connected every 2 seconds delay(1000); getRelayState(); //fetch data from NVS Flash Memory // delay(1000); } void loop() { Blynk.run(); timer.run(); button1.check(); button2.check(); button3.check(); button4.check(); ir_remote(); //IR remote Control } void button1Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) { Serial.println("EVENT1"); switch (eventType) { case AceButton::kEventPressed: state1 = 1; digitalWrite(relay1, LOW); preference.putBool("Relay1", state1); Blynk.virtualWrite(virtual_pin1, state1); break; case AceButton::kEventReleased: state1 = 0; digitalWrite(relay1, HIGH); preference.putBool("Relay1", state1); Blynk.virtualWrite(virtual_pin1, state1); break; } } void button2Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) { Serial.println("EVENT2"); switch (eventType) { case AceButton::kEventPressed: state2 = 1; digitalWrite(relay2, LOW); preference.putBool("Relay2", state2); Blynk.virtualWrite(virtual_pin2, state2); break; case AceButton::kEventReleased: state2 = 0; digitalWrite(relay2, HIGH); preference.putBool("Relay2", state2); Blynk.virtualWrite(virtual_pin2, state2); break; } } void button3Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) { Serial.println("EVENT3"); switch (eventType) { case AceButton::kEventPressed: state3 = 1; digitalWrite(relay3, LOW); preference.putBool("Relay3", state3); Blynk.virtualWrite(virtual_pin3, state3); break; case AceButton::kEventReleased: state3 = 0; digitalWrite(relay3, HIGH); preference.putBool("Relay3", state3); Blynk.virtualWrite(virtual_pin3, state3); break; } } void button4Handler(AceButton* button, uint8_t eventType, uint8_t buttonState) { Serial.println("EVENT4"); switch (eventType) { case AceButton::kEventPressed: state4 = 1; digitalWrite(relay4, LOW); preference.putBool("Relay4", state4); Blynk.virtualWrite(virtual_pin4, state4); break; case AceButton::kEventReleased: state4 = 0; digitalWrite(relay4, HIGH); preference.putBool("Relay4", state4); Blynk.virtualWrite(virtual_pin4, state4); break; } } void checkBlynkStatus() { // called every 3 seconds by SimpleTimer bool isconnected = Blynk.connected(); if (isconnected == false) { wifiFlag = 1; digitalWrite(2, LOW); Serial.println("Blynk Not Connected"); } if (isconnected == true) { wifiFlag = 0; digitalWrite(2, HIGH); //Serial.println("Blynk Connected"); } } BLYNK_CONNECTED() { // update the latest state to the server Blynk.virtualWrite(virtual_pin1, state1); Blynk.virtualWrite(virtual_pin2, state2); Blynk.virtualWrite(virtual_pin3, state3); Blynk.virtualWrite(virtual_pin4, state4); }