Human sensor for robbers

[electronic novice]

recently weved got robbed while we are sleeping. I want to have a circuit that senses intruders if it passes by, does anyone knows thanks. Help is so much appreciated.

 

[misterT]

This could be very good choice:
**broken link removed**
**broken link removed**

 

[electronic novice]

how loud does the sound the sensor creates? its not stated.

 

[misterT]

how loud does the sound the sensor creates? its not stated.

The one I posted is a motion detection sensor. It does not make sound. It only gives out an electronic signal when it detects motion.