Serial Integer Reader

/*
 * Serial Integer Reader, by Pedro Tome'
 * Version 0.01
 *
 * Reads integer numbers from the Serial buffer and translates them
 * into the value of the variable "number".
 *
 * Use this code if you want to read integer values from another Arduino,
 * which should have the Serial Integer Writer code, by Pedro Tome'.
 *
 * Example:
 * The number 3782 is outputted to the Serial buffer.
 * The variable "number" now holds the value 3782.
 *
 * The maximum value is 65535 due to "number" being an unsigned int.
 */


char charArray[6];
int intArray[6];
unsigned int number;


void setup() {
  Serial.begin(9600);
}


void loop () {
  int charIndex = 1;
  int intIndex = 1;
  int max_intIndex;
  number = 0;

  /* If there is something in the serial buffer */
  if (Serial.available()){

    /* Read the data from Serial and store it in a charArray */
    while (Serial.available()) {  // while there's something in the serial buffer...
      int serialIn = Serial.read();
      delay(5);
      charArray[charIndex] = serialIn;  // store everything that was read in charArray byte-by-byte
      charArray[charIndex+1] = '\0';  // add a NULL value
      charIndex++;
    }
    charIndex = 1;  // Reset charIndex


    /* Separate the charArray and convert it into an intArray */
    while (charArray[charIndex] != '\0') {  // while the value is not NULL, ie, while there's a relevant value
      max_intIndex = intIndex;
      intArray[intIndex] = charArray[charIndex]-'0';
      charIndex++;
      intIndex++;
    }
    intIndex = 1;  // Reset intIndex


    /* Build one single number from the intArray */
    for (intIndex = 1; intIndex <= max_intIndex; intIndex++) {
      number = number*10 + intArray[intIndex];
    }

    Serial.print("number: "); Serial.println(number);
    Serial.flush();
  }
}