In the center of the sensor module, you have the main pyroelectric sensor that allows IR rays to pass through and blog any other ... Connect the PIR sensor's VCC (or +) pin to the Arduino's 5V output.

[ladyada] has a freshly-published and amazingly thorough tutorial on passive infrared (PIR ... most PIR sensors (like the one above) come in a simple-to-interface module containing all the ...

The analog value from the sensor is converted to distance using either a polynomial fit function up to fifth order or a power fit function. By default, this library is set to use polynomial ...