Can you see my code?

Other Hardware Sensors
1

so, i'm making a PIR sensor for my alarms, but for some reason, my code keep adding some delay to the alarms, how do i remove the delay??

//the time we give the sensor to calibrate (10-60 secs according to the datasheet)
int calibrationTime = 5;        

//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 = 0;  

boolean lockLow = true;
boolean takeLowTime;  

int pirPin = 7;    //the digital pin connected to the PIR sensor's output
int ledPin = 6;    //the digital pin connected to the LED output
int Buzzer = 5;    //the digital pin connected to the BUZZER output
 
/////////////////////////////
//SETUP
void setup(){
  Serial.begin(9600);
  pinMode(pirPin, INPUT);
  pinMode(ledPin, OUTPUT);
  pinMode(Buzzer, 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
       tone(Buzzer,1000);
       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(10);
         }         
         takeLowTime = true;
       }

     if(digitalRead(pirPin) == LOW){       
       digitalWrite(ledPin, LOW);  //the led visualizes the sensors output pin state
       noTone(Buzzer);
       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);
           }
       }
  }

you can ask more details about it, i'm using arduino uno

2

No it is not the code, it is the PIR sensor itself, there is nothing you can do in code. Inside the sensor there is normally a potentiometer you can adjust to shorten this delay. However, the range of adjustments is normally not short enough.

I made a project some years back where I needed this delay to be as short as possible and I had to make a modification to the sensor. It was called "statues" and was in the MagPi magazine #51.
This is a link to the free PDF download of that issue:-

Note that there are several models of PIR sensor and this describes the hardware changes to one only .

3

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