Intruder/burglar Alarms

[John Murdock]

Has anyone come across or know of any intruder alarms based on some sort of motion sensing that triggers sound/light alarm which could work in practice?

 

[ericgibbs]

him
I use these PIR's from Amazon.
They have a 3V output when a PIR object is detected, adjustable sensitivity and On period.

The PIR output can drive a transistor/relay combination

E

 

[Dr_Doggy]

this is motion sensor light:
**broken link removed**

you could put one of these on it:
http://ecx.images-amazon.com/images/I/616sfQwB+LL._SL1102_.jpg

then you could attach a ac120v-12v power adapter to power a common 12v alarm
http://site.ambery.com/webgraph/ACDC12V1A-Product.gif