Char Test Reader (Arduino C)

char_test_reader.c

// Arduino Char -> Number over serial. For testing, etc.
// @author Iain Nash iain.in
// @date 12/13/11

//#define PWM_DEMO 1
// ^ uncomment for pwm demo
#define PWM_DEMO 0
// ^ and comment this

int get_serial_num(){
  int out = 0, i = 0, in;
  while(true){
    in = Serial.read();
    if (in > 0 && in > 47 && in < 58){
      out += ((in - 48) * (pow(10, Serial.available())));
    } else { break; }
    i++;
  }
  return out;
}

void setup(){
  Serial.begin(9600);
  if (PWM_DEMO){
    pinMode(3, OUTPUT);
  } else {
    pinMode(13, OUTPUT);
  }
}

void loop(){
 if (Serial.available()){
   if (PWM_DEMO){
     analogWrite(3, get_serial_num());
   } else {
     digitalWrite(13, HIGH);
     delay(get_serial_num());
     digitalWrite(13, LOW);
   }
 }
}