/* /////////////////////////////////////
* Mistletoe Code modified by Leslie Birch with huge thanks to PIRsense Code from Arduino Playground
* The base code is for the Parallax PIR Sensor, which is similar to the Adafruit PIR Sensor
* @author: Kristian Gohlke / krigoo (_) gmail (_) com / http://krx.at
* @date: 3. September 2006
*
* kr1 (cleft) 2006
* released under a creative commons "Attribution-NonCommercial-ShareAlike 2.0" license
* http://creativecommons.org/licenses/by-nc-sa/2.0/de/
*
*
* The sensor's output pin goes to HIGH if motion is present.
* However, even if motion is present it goes to LOW from time to time,
* which might give the impression no motion is present.
* This program deals with this issue by ignoring LOW-phases shorter than a given time,
* assuming continuous motion is present during these phases.
*
*/
/////////////////////////////
//VARS
//the time we give the sensor to calibrate (10-60 secs according to the datasheet)
int calibrationTime = 30;
//the time when the sensor outputs a low impulse
long unsigned int lowIn;
//the amount of milliseconds the sensor has to be low
//before we assume all motion has stopped
long unsigned int pause = 2000;
boolean lockLow = true;
boolean takeLowTime;
int pirPin = 0; //the digital pin connected to the PIR sensor's output
int ledPin1 = 1;
int ledPin2 = 2;
int ledPin3 = 3;
int ledPin4 = 4;
/////////////////////////////
//SETUP
void setup(){
//Serial.begin(9600);
pinMode(pirPin, INPUT);
pinMode(ledPin1, OUTPUT);
pinMode(ledPin2, OUTPUT);
pinMode(ledPin3, OUTPUT);
pinMode(ledPin4, OUTPUT);
digitalWrite(pirPin, LOW);
//give the sensor some time to calibrate
//Serial.print("calibrating sensor ");
for(int i = 0; i < calibrationTime; i++){
// Serial.print(".");
delay(1000);
}
// Serial.println(" done");
// Serial.println("SENSOR ACTIVE");
delay(50);
}
////////////////////////////
//LOOP
void loop(){
if(digitalRead(pirPin) == HIGH){
digitalWrite(ledPin1, HIGH); //the led visualizes the sensors output pin state
delay (200);
digitalWrite(ledPin3, HIGH); //the led visualizes the sensors output pin state
delay (400);
digitalWrite(ledPin2, HIGH); //the led visualizes the sensors output pin state
delay (200);
digitalWrite(ledPin4, HIGH); //the led visualizes the sensors output pin state
if(lockLow){
//makes sure we wait for a transition to LOW before any further output is made:
lockLow = false;
// Serial.println("---");
// Serial.print("motion detected at ");
// Serial.print(millis()/1000);
// Serial.println(" sec");
delay(50);
}
takeLowTime = true;
}
if(digitalRead(pirPin) == LOW){
digitalWrite(ledPin4, LOW); //the led visualizes the sensors output pin state
delay (200);
digitalWrite(ledPin2, LOW); //the led visualizes the sensors output pin state
delay (400);
digitalWrite(ledPin3, LOW); //the led visualizes the sensors output pin state
delay (200);
digitalWrite(ledPin1, LOW); //the led visualizes the sensors output pin state
if(takeLowTime){
lowIn = millis(); //save the time of the transition from high to LOW
takeLowTime = false; //make sure this is only done at the start of a LOW phase
}
//if the sensor is low for more than the given pause,
//we assume that no more motion is going to happen
if(!lockLow && millis() - lowIn > pause){
//makes sure this block of code is only executed again after
//a new motion sequence has been detected
lockLow = true;
//Serial.print("motion ended at "); //output
//Serial.print((millis() - pause)/1000);
// Serial.println(" sec");
delay(50);
}
}
}
This guide was first published on Dec 18, 2014. It was last updated on Dec 18, 2014.
This page (Code) was last updated on Dec 10, 2014.
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