Use of Arduino for intrusion detection mechanism

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hi,
i new forum. must impressed way people helping each others sharing knowledge.

i have question related project (intrusion detection mechanism) have in mind. start have small goal of intrusion detection room 10 x 10 feets in size.

i have purchased following:
1.arduino uno,
2. ultrasonic distance sensor (http://www.simplelabs.co.in/content/ultrasonic-distance-sensor-hc-sr04) having range of 2cm - 500 cm.
3. infrared proximity sensor (https://www.sparkfun.com/products/242) range of 5 feet away.

please comment on :
1. other alternatives can use.
2. has 1 tried project earlier.

regards,
saurabh

hi saurabh, both of devices link made measuring distance, ,
not intrusion detection. might check out pir = passive infrared devices,
https://www.sparkfun.com/search/results?term=pir&what=products


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