A PIR or Ultrasonic motion detector that will turn on some big quartz lights and a big Klaxon horn might scare somebody away. Or magnetic switches on the doors to switch on the same stuff. The door switches are less prone to false trips. There are alarms that will auto dial preset phone numbers. Sometimes you can identify intruders with a good, properly installed, video camera/recorder, but that's after the deed has been done. The systems that send you a photo of activity work if you or the police are next door, but usually there is travel time involved and the ill doers are gone by the time somebody shows up. To be fully legal in court photos and video need a "time stamp" that can prove the material has not been altered.
Part of my job was specing and installing security cameras on campus. Our main supplier was www.directlvs.com and some from www.securitycamerasdirect.com (usually just dome cameras from them)
Amazon.com and Newegg.com sometimes have a decent deal on less expensive packages. The big trend now is networked H.264 digital cameras feeding a DVR (digital video recorder). A decent H.264 camera with lens will run around $1k each.
If you do decide to go with a camera: Do not point it directly at an exterior door, from the inside. In the daytime, when the door opens, outside light will trick an auto iris lens and all you will see is a silhouette in the doorway. There are cameras with DSP that will compensate but they are $$.
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Today's Featured Article - Trenching With a Plow - by Staff. Introduction: This interesting information came from one of the discussion forums here at YT. We thought we should place it up front so it could be read by anyone interested in putting old iron to work. [Editor] I tried something new today, and it worked so well I thought I should post it - in case it might help someone else. I'm running 100 yards of 4" drain pipe from the gutter downspouts of our house to a pond down the hill. This should hel
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