const int switchPin1 = A0;   // Pin for the first red momentary contact switch
const int switchPin2 = A1;   // Pin for the second yellow momentary contact switch
const int switchPin3 = A2;   // Pin for the third switch
const int switchPin4 = A3;   // Pin for the fourth switch
const int switchPin5 = A4;   // Pin for the fifth switch
const int switchPin6 = A5;   // Pin for the sixth switch
const int switchPin7 = 13;   // Pin for the seventh switch
const int switchPin8 = 12;   // Pin for the eighth switch
const int switchPin9 = 11;   // Pin for the ninth switch

const int ledPin1 = 2;     // Pin for the first LED
const int ledPin2 = 3;     // Pin for the second LED
const int ledPin3 = 4;     // Pin for the third LED
const int ledPin4 = 5;     // Pin for the fourth LED
const int ledPin5 = 6;     // Pin for the fifth LED
const int ledPin6 = 7;     // Pin for the sixth LED
const int ledPin7 = 8;     // Pin for the seventh LED
const int ledPin8 = 9;     // Pin for the eighth LED
const int ledPin9 = 10;    // Pin for the ninth LED

bool switchState1 = false;  // Current state of the first switch
bool switchState2 = false;  // Current state of the second switch
bool switchState3 = false;  // Current state of the third switch
bool switchState4 = false;  // Current state of the fourth switch
bool switchState5 = false;  // Current state of the fifth switch
bool switchState6 = false;  // Current state of the sixth switch
bool switchState7 = false;  // Current state of the seventh switch
bool switchState8 = false;  // Current state of the eighth switch
bool switchState9 = false;  // Current state of the ninth switch

bool ledState1 = false;     // Current state of the first LED
bool ledState2 = false;     // Current state of the second LED
bool ledState3 = false;     // Current state of the third LED
bool ledState4 = false;     // Current state of the fourth LED
bool ledState5 = false;     // Current state of the fifth LED
bool ledState6 = false;     // Current state of the sixth LED
bool ledState7 = false;     // Current state of the seventh LED
bool ledState8 = false;     // Current state of the eighth LED
bool ledState9 = false;     // Current state of the ninth LED

bool previousSwitchState1 = false;  // Previous state of the first switch
bool previousSwitchState2 = false;  // Previous state of the second switch
bool previousSwitchState3 = false;  // Previous state of the third switch
bool previousSwitchState4 = false;  // Previous state of the fourth switch
bool previousSwitchState5 = false;  // Previous state of the fifth switch
bool previousSwitchState6 = false;  // Previous state of the sixth switch
bool previousSwitchState7 = false;  // Previous state of the seventh switch
bool previousSwitchState8 = false;  // Previous state of the eighth switch
bool previousSwitchState9 = false;  // Previous state of the ninth switch

void setup() {
  pinMode(switchPin1, INPUT_PULLUP);  // Set the first switch pin as input with internal pull-up resistor
  pinMode(switchPin2, INPUT_PULLUP);  // Set the second switch pin as input with internal pull-up resistor
  pinMode(switchPin3, INPUT_PULLUP);  // Set the third switch pin as input with internal pull-up resistor
  pinMode(switchPin4, INPUT_PULLUP);  // Set the fourth switch pin as input with internal pull-up resistor
  pinMode(switchPin5, INPUT_PULLUP);  // Set the fifth switch pin as input with internal pull-up resistor
  pinMode(switchPin6, INPUT_PULLUP);  // Set the sixth switch pin as input with internal pull-up resistor
  pinMode(switchPin7, INPUT_PULLUP);  // Set the seventh switch pin as input with internal pull-up resistor
  pinMode(switchPin8, INPUT_PULLUP);  // Set the eighth switch pin as input with internal pull-up resistor
  pinMode(switchPin9, INPUT_PULLUP);  // Set the ninth switch pin as input with internal pull-up resistor

  pinMode(ledPin1, OUTPUT);            // Set the first LED pin as output
  pinMode(ledPin2, OUTPUT);            // Set the second LED pin as output
  pinMode(ledPin3, OUTPUT);            // Set the third LED pin as output
  pinMode(ledPin4, OUTPUT);            // Set the fourth LED pin as output
  pinMode(ledPin5, OUTPUT);            // Set the fifth LED pin as output
  pinMode(ledPin6, OUTPUT);            // Set the sixth LED pin as output
  pinMode(ledPin7, OUTPUT);            // Set the seventh LED pin as output
  pinMode(ledPin8, OUTPUT);            // Set the eighth LED pin as output
  pinMode(ledPin9, OUTPUT);            // Set the ninth LED pin as output
}

void loop() {
  switchState1 = digitalRead(switchPin1);  // Read the state of the first switch
  switchState2 = digitalRead(switchPin2);  // Read the state of the second switch
  switchState3 = digitalRead(switchPin3);  // Read the state of the third switch
  switchState4 = digitalRead(switchPin4);  // Read the state of the fourth switch
  switchState5 = digitalRead(switchPin5);  // Read the state of the fifth switch
  switchState6 = digitalRead(switchPin6);  // Read the state of the sixth switch
  switchState7 = digitalRead(switchPin7);  // Read the state of the seventh switch
  switchState8 = digitalRead(switchPin8);  // Read the state of the eighth switch
  switchState9 = digitalRead(switchPin9);  // Read the state of the ninth switch

  if (switchState1 != previousSwitchState1) {
    if (switchState1 == LOW) {  // If the first switch is pressed
      ledState1 = !ledState1;  // Toggle the first LED state
      digitalWrite(ledPin1, ledState1);  // Set the first LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }

  if (switchState2 != previousSwitchState2) {
    if (switchState2 == LOW) {  // If the second switch is pressed
      ledState2 = !ledState2;  // Toggle the second LED state
      digitalWrite(ledPin2, ledState2);  // Set the second LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }

 if (switchState3 != previousSwitchState3) {
    if (switchState3 == LOW) {  // If the third switch is pressed
      ledState3 = !ledState3;  // Toggle the third LED state
      digitalWrite(ledPin3, ledState3);  // Set the third LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }

  if (switchState4 != previousSwitchState4) {
    if (switchState4 == LOW) {  // If the fourth switch is pressed
      ledState4 = !ledState4;  // Toggle the fourth LED state
      digitalWrite(ledPin4, ledState4);  // Set the fourth LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }

  if (switchState5 != previousSwitchState5) {
    if (switchState5 == LOW) {  // If the fifth switch is pressed
      ledState5 = !ledState5;  // Toggle the fifth LED state
      digitalWrite(ledPin5, ledState5);  // Set the fifth LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }

  if (switchState6 != previousSwitchState6) {
    if (switchState6 == LOW) {  // If the sixth switch is pressed
      ledState6 = !ledState6;  // Toggle the sixth LED state
      digitalWrite(ledPin6, ledState6);  // Set the sixth LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }

  if (switchState7 != previousSwitchState7) {
    if (switchState7 == LOW) {  // If the seeventh switch is pressed
      ledState7 = !ledState7;  // Toggle the seventh LED state
      digitalWrite(ledPin7, ledState7);  // Set the seventh LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }

  if (switchState8 != previousSwitchState8) {
    if (switchState8 == LOW) {  // If the eight switch is pressed
      ledState8 = !ledState8;  // Toggle the eight LED state
      digitalWrite(ledPin8, ledState8);  // Set the eigth LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }

  if (switchState9 != previousSwitchState9) {
    if (switchState9 == LOW) {  // If the ninth switch is pressed
      ledState9 = !ledState9;  // Toggle the ninth LED state
      digitalWrite(ledPin9, ledState9);  // Set the ninth LED pin to the new state
    }
    delay(50);  // Delay for debouncing
  }



  previousSwitchState1 = switchState1;
  previousSwitchState2 = switchState2;
  previousSwitchState3 = switchState3;
  previousSwitchState4 = switchState4;
  previousSwitchState5 = switchState5;
  previousSwitchState6 = switchState6;
  previousSwitchState7 = switchState7;
  previousSwitchState8 = switchState8;
  previousSwitchState9 = switchState9;
}