Cellular Automata

/*
Created by Matthew Siu on 2017-1-17.
http://www.matthewsiu.com/
https://github.com/Siunami
https://www.linkedin.com/in/matthewwilsonsiu
*/

// BEGIN WITH PIN 5
// This can be changed to any starting values desired
int pinState[10] = {LOW, LOW, LOW, LOW, HIGH, LOW, LOW, LOW, LOW, LOW};
int pinUpdated[10] = {LOW, LOW, LOW, LOW, HIGH, LOW, LOW, LOW, LOW, LOW};

void setup() {
}

void loop() {
  delay(500);
  for (int i = 0; i < 10; i++){
    //Update Pins
    // First pin is in OUTPUT 2 so need to add 2 to each i value
    pinMode(i+2, OUTPUT);
    digitalWrite(i+2, pinState[i]);
    // RULES
    // Rules are checked on pinState array. pinUpdated array stores the updated values. 
    int left = i - 1; //pin to the left of current
    int right = i + 1; // pint to the right of current
    if (i == 0){ // First pin is only checked for the one next to it.
      if (pinState[right] == LOW){
        pinUpdated[i] = LOW;
      } else {
        pinUpdated[i] = HIGH;
      }
    } else if (i == 9){ // Last pin is only checked for the one next to it.
      if (pinState[left] == LOW){
        pinUpdated[i] = LOW;
      } else {
        pinUpdated[i] = HIGH;
      }
    } else if (pinState[left] == LOW && pinState[right] == LOW){ // If both adjacent pins are off, current pin is off
      pinUpdated[i] = LOW;
    } else if ((pinState[left] == HIGH && pinState[right] == LOW) 
    || (pinState[left] == LOW && pinState[right] == HIGH)){ // If one of the adjacent pins is on, current pin is now on
      pinUpdated[i] = HIGH;
    } else { // Both adjacent pins are on. Current pin suffocates and turns off(dies).
      pinUpdated[i] = LOW;
    }
  }
  // Set the pinState values to pinUpdated values for next iteration.
  for (int y = 0; y < 10; y++){
    pinState[y] = pinUpdated[y];
  }
}