const int buttonPin = A0;  // The pin the button is connected to
const int appliancePins[] = {2 ,3 ,4};  // Pins connected to the appliances
const int numAppliances = 3;  // Number of appliances
int currentState = 0;  // Current state
bool lastButtonState = HIGH;  // Previous state of the button

void setup() {
  // Initialize button pin
  pinMode(buttonPin, INPUT_PULLUP);
  // Initialize appliance pins
  for (int i = 0; i < numAppliances; i++) {
    pinMode(appliancePins[i], OUTPUT);
    digitalWrite(appliancePins[i], LOW);  // Turn off all appliances initially
  }
}

void loop() {
  // Read the state of the button
  bool buttonState = digitalRead(buttonPin);

  // Check if the button is pressed and the state has changed
  if (buttonState == LOW && lastButtonState == HIGH) {
    // Move to the next state
    currentState = (currentState + 1) % (numAppliances + 1);

    // Toggle the corresponding appliance
    if (currentState == 0) {
      // Turn off all appliances if currentState is 0
      for (int i = 0; i < numAppliances; i++) {
        digitalWrite(appliancePins[i], LOW);
      }
    } else {
      // Turn off all appliances
      for (int i = 0; i < numAppliances; i++) {
        digitalWrite(appliancePins[i], LOW);
      }
      // Turn on the appliance corresponding to the currentState
      digitalWrite(appliancePins[currentState - 1], HIGH);
    }
  }

  // Update the last button state
  lastButtonState = buttonState;
}