gistfile1.c

const int ledPin = 13; // the pin that the LED is attached to
char incomingString[10];    

void setup() {
  // initialize serial communication:
  Serial.begin(9600);
  // initialize the LED pin as an output:
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // see if there's incoming serial data:
  int i = 0;
  while (Serial.available() > 0) {
      incomingString[i++] = (char)Serial.read();
      delay(10);
  }
  
    // turn on the LED:
    if (incomingString == "Ican2") {
      digitalWrite(ledPin, HIGH);
    } 
    // turn off the LED:
    if (incomingString == "Ican22") {
      digitalWrite(ledPin, LOW);
    }
  
}