On a low tech note, is anyone using one of the the cheap ebay alarms? there are pages of them but really only about 3 or 4 types, I bought the Defender one because it had a vibration sensor that would set it off if the door was shaken, and it all looked good in the photo but was a disapointing bit of cheap junk, and within a few days the siren which always went off before it could be keypad disabled turned into a pathetic squeek,,so I got a refund.
I had previously been using one of the Alarm Padlocks which our local council was selling and I have to say that it seemed good, beeped if if disturbded and was a reasonably loud siren if touched again, it lasted a couple of years befor the electronics gave up,,but I liked it because it would warn intruders off before damage was done. All I can see are either magnetic contact door alarms, which require the door to open, or the PIR type which would not go off untill they had broken in,,,Im also concerned that these pir jobs might be set off by spiders and the like..anyone got any ideas on what works?
I have been thinking of trying to create a trip wire type of thing, say just a bit back from the door so that it would be pulled by somone going towards the door and set off,,
Steve.