switch relay 3 with interrupt -ok

diagram.json

{
  "version": 1,
  "author": "cccc",
  "editor": "wokwi",
  "parts": [
    { "type": "board-esp32-devkit-c-v4", "id": "esp", "top": -86.4, "left": -23.96, "attrs": {} },
    {
      "type": "wokwi-relay-module",
      "id": "relay1",
      "top": -77.4,
      "left": -300.8,
      "rotate": 180,
      "attrs": {}
    },
    {
      "type": "wokwi-relay-module",
      "id": "relay2",
      "top": 153,
      "left": -310.4,
      "rotate": 180,
      "attrs": {}
    },
    {
      "type": "wokwi-relay-module",
      "id": "relay3",
      "top": 37.8,
      "left": -310.4,
      "rotate": 180,
      "attrs": {}
    },
    {
      "type": "wokwi-slide-switch",
      "id": "sw1",
      "top": -113.6,
      "left": 154.1,
      "rotate": 90,
      "attrs": {}
    },
    {
      "type": "wokwi-slide-switch",
      "id": "sw2",
      "top": 206,
      "left": 204.7,
      "rotate": 90,
      "attrs": {}
    },
    {
      "type": "wokwi-slide-switch",
      "id": "sw3",
      "top": 110,
      "left": 204.7,
      "rotate": 90,
      "attrs": {}
    }
  ],
  "connections": [
    [ "esp:TX", "$serialMonitor:RX", "", [] ],
    [ "esp:RX", "$serialMonitor:TX", "", [] ],
    [ "esp:GND.2", "sw1:1", "black", [ "h28.8", "v-19.2" ] ],
    [ "esp:5V", "relay1:VCC", "red", [ "h-86.25", "v-115.2" ] ],
    [ "esp:GND.1", "relay1:GND", "black", [ "h-67.05", "v-77.2" ] ],
    [ "sw1:2", "esp:5", "green", [ "h-9.6", "v124.9" ] ],
    [ "esp:GND.2", "sw3:1", "black", [ "h28.8", "v201.6" ] ],
    [ "esp:GND.2", "sw2:1", "black", [ "h28.8", "v297.6" ] ],
    [ "sw3:2", "esp:17", "green", [ "h-31.4", "v-89.1", "h-68.9", "v0" ] ],
    [ "sw2:2", "esp:16", "green", [ "h-117.8", "v-175.5" ] ],
    [ "esp:GND.1", "relay3:GND", "black", [ "h0" ] ],
    [ "esp:5V", "relay3:VCC", "red", [ "h-134.25", "v-38.4" ] ],
    [ "esp:13", "relay2:IN", "green", [ "h-95.85", "v95.8" ] ],
    [ "esp:12", "relay3:IN", "green", [ "h-76.65", "v-0.2" ] ],
    [ "esp:14", "relay1:IN", "green", [ "h-19.05", "v-105.8" ] ],
    [ "esp:5V", "relay2:VCC", "red", [ "h-86.25", "v76.8" ] ],
    [ "esp:GND.1", "relay2:GND", "black", [ "h-67.05", "v114.8" ] ]
  ],
  "dependencies": {}
}

skent.ino

#define BUTTON_PIN_1 5
#define BUTTON_PIN_2 17
#define BUTTON_PIN_3 16
const int RELAY_1 = 14;
const int RELAY_2 = 12;
const int RELAY_3 = 13;

volatile bool buttonPressed[3] = {false, false, false}; // Flags to indicate button press
unsigned long lastDebounceTime[3] = {0, 0, 0};         // Debounce timers for each button
const unsigned long debounceDelay = 500;                // Debounce delay in milliseconds

const int buttonPins[3] = {BUTTON_PIN_1, BUTTON_PIN_2, BUTTON_PIN_3}; // Store button pins
const int relayPins[3] = {RELAY_1, RELAY_2, RELAY_3}; // Store relay pins

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN_1, INPUT_PULLUP);
  pinMode(BUTTON_PIN_2, INPUT_PULLUP);
  pinMode(BUTTON_PIN_3, INPUT_PULLUP);
  pinMode(RELAY_1, OUTPUT);
  pinMode(RELAY_2, OUTPUT);
  pinMode(RELAY_3, OUTPUT);

  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN_1), myInterruptFunction1, CHANGE);
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN_2), myInterruptFunction2, CHANGE);
  attachInterrupt(digitalPinToInterrupt(BUTTON_PIN_3), myInterruptFunction3, CHANGE);
}

void loop() {
  // Handle the button press flags and change relay state
  for (int i = 0; i < 3; i++) {
    if (buttonPressed[i]) {
      buttonPressed[i] = false;  // Reset the flag
      toggleRelay(i);            // Toggle the corresponding relay
    }
  }

  if (Serial.available() > 0) {
    String input = Serial.readStringUntil('\n'); // Read the input until newline character
    
    // Check for specific values
    if (input == "1") {
      Serial.println("You entered '1'");
      digitalWrite(relayPins[0], 1);
    } else if (input == "2") {
      Serial.println("You entered '2'");
      digitalWrite(relayPins[0], 0);
    } else if (input == "34") {
      Serial.println("You entered '34'");
    } else if (input == "4") {
      Serial.println("You entered '4'");
    } else {
      Serial.println("Unknown input");
    }
    
    Serial.println("Type another number (1, 2, 34, or 4) and press Enter:");
  }
}

void myInterruptFunction1() {
  handleButtonInterrupt(0, BUTTON_PIN_1);
}

void myInterruptFunction2() {
  handleButtonInterrupt(1, BUTTON_PIN_2);
}

void myInterruptFunction3() {
  handleButtonInterrupt(2, BUTTON_PIN_3);
}

void handleButtonInterrupt(int index, int pin) {
  unsigned long currentTime = millis();
  if (currentTime - lastDebounceTime[index] > debounceDelay) { // Check debounce time
    lastDebounceTime[index] = currentTime;  // Update debounce time
    buttonPressed[index] = true;            // Set the button press flag
  }
}

void toggleRelay(int index) {
  int currentRelayState = digitalRead(relayPins[index]);
  digitalWrite(relayPins[index], !currentRelayState);  // Toggle relay
  Serial.print("Relay ");
  Serial.print(index + 1);
  Serial.print(" is now ");
  Serial.println(!currentRelayState ? "ON" : "OFF");
}