Logic Gate Implementation

Solving Approach

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Code

/*Paste your code here*/
#define SW1 2
#define SW2 3

#define LED_AND  8
#define LED_OR   9
#define LED_NAND 10
#define LED_NOR  11

void setup() {
  pinMode(SW1, INPUT_PULLUP);  // Switch with pull-up
  pinMode(SW2, INPUT_PULLUP);

  pinMode(LED_AND, OUTPUT);
  pinMode(LED_OR, OUTPUT);
  pinMode(LED_NAND, OUTPUT);
  pinMode(LED_NOR, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  // Read switches (LOW = pressed, HIGH = released)
  int a = !digitalRead(SW1);  // invert so pressed = 1
  int b = !digitalRead(SW2);

  // Logic gates
  int and_out  = a & b;
  int or_out   = a | b;
  int nand_out = !(a & b);
  int nor_out  = !(a | b);

  // Drive LEDs
  digitalWrite(LED_AND, and_out);
  digitalWrite(LED_OR, or_out);
  digitalWrite(LED_NAND, nand_out);
  digitalWrite(LED_NOR, nor_out);

  // Print on serial monitor
  Serial.print("A=");
  Serial.print(a);
  Serial.print(" B=");
  Serial.print(b);
  Serial.print(" | AND=");
  Serial.print(and_out);
  Serial.print(" OR=");
  Serial.print(or_out);
  Serial.print(" NAND=");
  Serial.print(nand_out);
  Serial.print(" NOR=");
  Serial.println(nor_out);

  delay(200);
}

Output

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