Sensor PIR no arduino

01 ABR
2016

Autor: Leonardo Dalla Porta

Neste tutorial você verá como conectar um Sensor PIR no arduino de forma muito simples, além disso você aprenderá a montar um alarme temporizado utilizando o arduino!

Você vai precisar de:

  • Sensor PIR
  • Arduino UNO
  • Jumpers
  • Protoboard
  • Led
  • Resistor

Ligaçoes:

A fiação é bastante simples, o sensor PIR tem impresso: o + e o – e o sinal. Caso haja duvidas segue a imagem para auxilia-lo:

Imagem de Setup

Código

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/* 
 * //////////////////////////////////////////////////
 * //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.
 *  
 */
 
/////////////////////////////
//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 = 5000;  
 
boolean lockLow = true;
boolean takeLowTime;  
 
int pirPin = 7;    //the digital pin connected to the PIR sensor's output
int ledPin = 8;
 
 
/////////////////////////////
//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()/1000); 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)/1000);
           Serial.println(" sec");
           delay(50);
           }
       }
  }

Você pode ver a partir do código, o sensor regula-se primeiro e depois relógios para o movimento. Quando se detecta o movimento, a luz azul acende-se. Você pode assistir no monitor serial para ver quanto tempo dura o movimento.

Imagem de Código

 

Qualquer dúvida deixe seu comentário abaixo, espero ter sido esclarecedor, um abraço e até a próxima!

Faça um bom uso! Att. Equipe Nadiel Comércio.

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