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[项目] PIR人体感应开关的应用

PIR人体感应开关的应用

前几天一位朋友拿来一个PIR，那是深圳产的家庭智能控制设备的zigbee网联网的一个设备。属于安防设备。但他对它不太满意，认为每次都要手机点击好多页面很麻烦。因此他拿来了这个，希望楼主改一下。让它不受主控的控制，变成一个独立设备。而且出差住旅馆也可以用。他原本以为换一个元件的事。楼主就说了句这不是换个螺丝的事。然后就问他需要什么功能，也没跟他解释那么多。因为说不清楚。

单片机是AVR 8位机。

喇叭-5V

PIR 就是普通的淘宝货。实测可达3M。

/////////////////////////////
//VARS
//the time we give the sensor to calibrate (10-60 secs according to the datasheet)
int calibrationTime = 45;

//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 = 3; //the digital pin connected to the PIR sensor's output
int ledPin = 11;
int led1=8;
int led2=7;

/////////////////////////////
//SETUP
void setup(){
  Serial.begin(9600);
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(led1,OUTPUT);
  pinMode(led2,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);
  }
  void alert()
  {

digitalWrite(led1,HIGH);
digitalWrite(led2,LOW);

delay(50);
digitalWrite(led2,HIGH);digitalWrite(led1,LOW);
delay(50);

  }

void loop(){

   if(digitalRead(pirPin) == HIGH){
   analogWrite(ledPin, 50);
   alert();
   digitalWrite(led1,LOW);
            digitalWrite(led2,LOW);

   ;//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);
         }
   }
  }