uint8_t gate_leds[4] = { 2, 3, 4, 5 };  // Pins for the LEDs representing logic gates (OR, AND, NOR, NAND)
uint8_t switch_pins[2] = { 8, 9 };      // Pins for the switches (inputs A and B)

uint8_t input_a = 1, input_b = 1;  // Variables to store the states of switches A and B

uint8_t ButtonState[2] = { HIGH, HIGH };      // Store the state of each button


void setup() {
  // Configure gate LED pins as outputs
  for (int i = 0; i < 4; i++) {
    pinMode(gate_leds[i], OUTPUT);
  }

  // Configure switch pins as inputs
  for (int i = 0; i < 2; i++) {
    pinMode(switch_pins[i], INPUT_PULLUP);
  }
}


void loop() {

    input_a = !digitalRead(switch_pins[1]);
    input_b = !digitalRead(switch_pins[0]);

  //LEDs update only when inputs A or B change.
  if ( input_a != ButtonState[1] || input_b != ButtonState[0]) {
  
    // Perform logic gate operations and update the corresponding LEDs state
    digitalWrite(gate_leds[0], input_a | input_b);     // OR operation
    digitalWrite(gate_leds[1], input_a & input_b);     // AND operation
    digitalWrite(gate_leds[2], !(input_a | input_b));  // NOR operation
    digitalWrite(gate_leds[3], !(input_a & input_b));  // NAND operation
    ButtonState[1] = input_a;
    ButtonState[0] = input_b;
  }
  
}