user47469: 
Case 1
I am measuring output voltage of PIR sensor, I am getting 3.3v
Case 2
I have connected a resistor and a led to output of PIR sensor. Now when I measure voltage at the output pin of the sensor, I am getting 2.04v only.
In case 2 as the output voltage is dropped, it is not able to trigger a high state to arduino pin. 
Where am I going wrong? What shall I change?

user2881: The PIR can’t provide enough current to drive the led. The maximum current for the BIS0001 is 10mA. 
Either increase the resistor value, and accept that the led is less bright. 
Or use a transistor to drive the led. 
Or connect the led to an Arduino pin and turn the led on by code, based on the input pin connected to the PIR

47469: <p><img src="https://i.stack.imgur.com/vtjUa.jpg" alt="enter image description here"><img src="https://i.stack.imgur.com/1aKYL.jpg" alt="enter image description here"></p>

<p>Case 1
I am measuring output voltage of PIR sensor, I am getting 3.3v</p>

<p>Case 2
I have connected a resistor and a led to output of PIR sensor. Now when I measure voltage at the output pin of the sensor, I am getting 2.04v only.</p>

<p>In case 2 as the output voltage is dropped, it is not able to trigger a high state to arduino pin. </p>

<p>Where am I going wrong? What shall I change?</p>
 2881: <p>The PIR can’t provide enough current to drive the led. The maximum current for the BIS0001 is 10mA. </p>

<p>Either increase the resistor value, and accept that the led is less bright. </p>

<p>Or use a transistor to drive the led. </p>

<p>Or connect the led to an Arduino pin and turn the led on by code, based on the input pin connected to the PIR</p>
