pir sensor

    int pirPin = 22;
    
    int minSecsBetweenEmails = 60; // 1 min
    
    long lastSend = -minSecsBetweenEmails * 1000l;
    
    void setup()
    {
      pinMode(pirPin, INPUT);
      Serial.begin(9600);
    }
    
    void loop()
    {
      long now = millis();
      if (digitalRead(pirPin) == HIGH)
      {
        if (now > (lastSend + minSecsBetweenEmails * 1000l))
        {
          Serial.println("MOVEMENT");
          lastSend = now;
        }
        else
        {
          Serial.println("Too soon");
        }
      }
      delay(500);
    }

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// Uses a PIR sensor to detect movement, buzzes a buzzer
// more info here: http://blog.makezine.com/projects/pir-sensor-arduino-alarm/
// email me, John Park, at jp@jpixl.net
// based upon:
// PIR sensor tester by Limor Fried of Adafruit
// tone code by michael@thegrebs.com

 
int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status
int pinSpeaker = 10;           //Set up a speaker on a PWM pin (digital 9, 10, or 11)

void setup() {
  pinMode(ledPin, OUTPUT);      // declare LED as output
  pinMode(inputPin, INPUT);     // declare sensor as input
  pinMode(pinSpeaker, OUTPUT);
  Serial.begin(9600);
}

void loop(){
  val = digitalRead(inputPin);  // read input value
  if (val == HIGH) {            // check if the input is HIGH
    digitalWrite(ledPin, HIGH);  // turn LED ON
    playTone(300, 160);
    delay(150);

    
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
      digitalWrite(ledPin, LOW); // turn LED OFF
      playTone(0, 0);
      delay(300);    
      if (pirState == HIGH){
      // we have just turned off
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}
// duration in mSecs, frequency in hertz
void playTone(long duration, int freq) {
    duration *= 1000;
    int period = (1.0 / freq) * 1000000;
    long elapsed_time = 0;
    while (elapsed_time < duration) {
        digitalWrite(pinSpeaker,HIGH);
        delayMicroseconds(period / 2);
        digitalWrite(pinSpeaker, LOW);
        delayMicroseconds(period / 2);
        elapsed_time += (period);
    }
} 

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