// Reading Passive InfraRed (PIR) Motion Sensor
// Added ability to turn on a function only once and
// no restart it until it's finished. 
// Note: The PIM can take from 10 to 60 seconds to warm up when 
// first started. 


int ledPin = 2;
int sensorPin = 3;
int sensorFlag = 1;

void setup() {
  Serial.begin(9600); 
  pinMode(ledPin, OUTPUT);
  pinMode(sensorPin, INPUT);
}

void loop() {
  Serial.println(digitalRead(sensorPin));
  if (digitalRead(sensorPin)) {
    if (sensorFlag) { doBlink(); }
  }
}

void doBlink() {
  sensorFlag = 0;
  for(int i=1; i <= 5; i++) {
    Serial.print("blinking: "); Serial.println(i);
    digitalWrite(ledPin, HIGH);
    delay(500);
    digitalWrite(ledPin, LOW);
    delay(250);
  }
  sensorFlag = 1;
}