number_serial.ino

String inString = "";    // string to hold input
int val;

int latchPin = 8;
int clockPin = 12;
int dataPin = 11;

void setup() {
  pinMode(latchPin, OUTPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(dataPin, OUTPUT);
  
  Serial.begin(9600);
  Serial.println("\n\nString toInt():");
  Serial.println();
}

void loop() {
  if (Serial.available() > 0) {
    int inChar = Serial.read();
    if (isDigit(inChar)) {
      inString += (char)inChar;
    }

    if (inChar == '\n') {
      val = inString.toInt();
//      Serial.print("Value:");
//      Serial.println(val);
//      Serial.print("String: ");
//      Serial.println(inString);
      // clear the string for new input:
      inString = "";
    }

    digitalWrite(latchPin, LOW);
    shiftOut(dataPin, clockPin, LSBFIRST, val);
    digitalWrite(latchPin, HIGH);
   // Serial.println(val,BIN);
    delay(100);
  }
  Serial.println(val, BIN);
}