A Gist describing the code on a Spark-powered security system (motion detector and buzzer).

spark-motion.c

int motion = 0;
int buzzer = 1;

void setup() {
  pinMode(motion, INPUT);
  pinMode(buzzer, OUTPUT);
  Spark.variable(motion);
  Spark.function(buzz);
}

void loop() {
  if (motion == HIGH) {
    if (Spark.connected()) {
      Spark.event("motion");
    }
    buzz();
  }
}

void buzz() {
  digitalWrite(buzzer, HIGH);
  delay(1000);
  digitalWrite(buzzer, LOW);
}