Electronic – arduino – PIR sensor always gives HIGH

arduinopirsensor

This is my first time to use PIR (HC-SR501 ) . It's in repeat trigger model. But when I test the output of the PIR , it gives always HIGH .
enter image description here

I rotate sensitivity adjustment and time delay adjustment randomly to see any changes occur. I even cover the sensor with cloth so that It get's no infrared . still it gives high.
I changed my sensor and bought a new one. This shows the same problem too.
arduino code :

int PIC_IN = 10;
int LED = 13;


void setup()
   {
  Serial.begin(9600);
   pinMode(PIC_IN, INPUT);

  digitalWrite(LED, LOW);
   }

void loop()
{
  int val = digitalRead(PIC_IN);
   if (val == HIGH)
   {
  Serial.println("Moton detected");
  digitalWrite(LED, HIGH);
   }
else
   {
    Serial.println("...........");
  digitalWrite(LED, LOW);
    }
  }

here is the link for PIR Datasheet.

What I am doing wrong ? I have no clue why it's not working.

Best Answer

I finally found a solution to this problementer image description here First you should adjust the delay knob to the left as min delay time.After connecting the power to the sensor, you should wait 1 min for the sensor to warm up, Now the sensor is ready to use and before this time its performance won't be stable. Also remember when you the sensor signal moves from high to low, it take around 5 seconds out of service, after than you can trigger it again.

After make sure it work properly you can increase the delay a little bit to increase the on time ^_^...

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