Hi I am having an issue with the HC-SR501 PIR sensor.
I have followed these instructions How to use Pyroelectric ("Passive") Infrared Sensors (PIR)
However, when I just try to connect a 9v battery and an LED to the sensor, it just blinks (indicating that it has detected movement).. even when there hasn't been any.
I have tried attaching it to the Arduino as per the example, and have the same problem.
Here is a video of my sensor
Here are a couple of pictures of my sensor:
https://drive.google.com/file/d/0By1bgqyE-fqqbUNvNmFpWV9fakE/edit?usp=sharing
https://drive.google.com/file/d/0By1bgqyE-fqqTzh2ODd0RHVEeUU/edit?usp=sharing
If you have any ideas on how to resolve this issue, please let me know.