//Logic gates - How it works!
int LED_0 = 6, LED_1 = 7;

void setup() {
  pinMode(LED_0, OUTPUT);
  pinMode(LED_1, OUTPUT);
}

void loop() {
  //Red LED - 0 if AND/1 if NAND
  digitalWrite(LED_0, 1);
  digitalWrite(LED_1, 0);
  delay(1000);
  //Red LED - 0 if AND/1 if NAND
  digitalWrite(LED_0, 0);
  digitalWrite(LED_1, 1);
  delay(1000);
  //Red LED - 0 if AND/1 if NAND
  digitalWrite(LED_0, 0);
  digitalWrite(LED_1, 0);
  delay(1000);
  //Red LED - 1 if AND/0 if NAND
  digitalWrite(LED_0, 1);
  digitalWrite(LED_1, 1);
  delay(1000);
}