Soon after I leased my first office space in a local industrial compound the in-house cleaning staff had an accident. One of the janitors that attended to that floor slipped on a wet tile and bumped my door clean off of its rusted hinges.
The moment I contacted my landlord he informed me that it would require 2 weeks to fix the door. Since my business office at that time was pretty much open to anyone I decided to invest in a motion alert alarm to keep intruders away.
I procured a small passive infrared alarm which was made to monitor entryways and mounted it facing the hole where my door used to be. My plan was to use it to alert the after-hours security guards to any kind of likely trespassers.
The motion-detecting alarm would sound anytime someone walks by it. And it could even be set up to perform a simple two-tone entry chime for when you are at the office and dont want the alarming to go off and call the guards.
It was battery-powered so that meant I could mount it in any convenient location around my office doorway. I would not have worry about getting landlord approval to drill and also run wires through the walls.
In the weeks that I had this security alarm I turned on the two-tone chime while I was in the office in order that I would know every time someone wanted to see me. I then switched it to alarm mode before I left for the day.
During this period the guards actually caught a few people trying to sneak into my office in the after-hours. These were generally homeless bums off the street that were aiming to steal whatever wasnt nailed down to sell it off for some quick cash.
It looks silly to have to go 2 weeks without a door but I was able to improvise a smart solution with a motion alert alarm. Instead of throwing the thing away I plan on keeping it and utilizing it in the future as part of a complete security system.