Sterowanie długością czasu włączenia oraz czułością czujnika odbywa się poprzez wbudowane potencjometry, możemy też sterować czasem pomiędzy wyłączeniem się czujnika a ponownym jego załączeniem, tak by mieć np. czas na uruchomieniu czujnika i opuszczenie pomieszczenia lub miejsca monitorującego - te parametry znajdują się w sketchu. No więc zaczynamy
Co potrzebujemy?
Oczywiście wszystko to co w poprzednich artykułach prezentowaliśmy, a także kolejny nowy moduł, czyli:
- moduł ATMEGA 2560
- przekaźnik 1 kanałowy
- oraz czujnik ruchu PIR-HC-SR501
Czujnik do kupienia np. tutaj:
lub tutaj:
Wszystko składamy według tego schematu:
Gotowy efekt:
Gotowy sketch do wgrania:
/*
* //////////////////////////////////////////////////
* //making sense of the Parallax PIR sensor's output
* //////////////////////////////////////////////////
*
* Switches a LED according to the state of the sensors output pin.
* Determines the beginning and end of continuous motion sequences.
*
* @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 Parallax PIR Sensor is an easy to use digital infrared motion sensor module.
* (http://www.parallax.com/detail.asp?product_id=555-28027)
*
* 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.
*
*/
// 5V left
// out midle
// gnd right
// connectors on bottom
/*
--------------------
| |
| |
| |
| o o o |
| 5V o GND |
--------------------
*/
/////////////////////////////
// voltage 4,5-20V
//
//VARS
//the time we give the sensor to calibrate (10-60 secs according to the datasheet)
int calibrationTime = 10;
//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 = 5000;
boolean lockLow = true;
boolean takeLowTime;
int pirPin = 24; //the digital pin connected to the PIR sensor's output
int ledPin = 22;
/////////////////////////////
//SETUP
void setup(){
Serial.begin(9600);
pinMode(pirPin, INPUT);
pinMode(ledPin, 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(ledPin, 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()/100);
Serial.println(" sec");
delay(50);
}
takeLowTime = true;
}
if(digitalRead(pirPin) == LOW){
digitalWrite(ledPin, 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)/500);
Serial.println(" sec");
delay(50);
}
}
}
Gotowiec do pobrania:
https://drive.google.com/open?id=1LWUOXvNGtNi2s0b4fidw0X50O0Pts1Lj
