Scotch Tape Intruder Sensor

About: Be limited only by your imagination.

I recently had someone doing work in my basement and needed to run an errand and wanted to know whether the worker went upstairs into the living space. I was almost certain I could trust him, but still wanted to verify this. My solution was simple. I took a piece of scotch tape about 2 inches long and put it on the door frame and the door itself. Then I cut it about 1/8 of the way thru with scissors on both sides to make it easy to rip and also with the logic that if someone noticed the tape after they opened the door (which was unlikely because of it's position) then they almost definitely would not think to replicate the cuts if they thought to replace the tape with another piece. When I came home I shined my flashlight at the tape. It was intact and so was my trust.

Of course, you can also use this to insure that someone has come in. For example, if you need to make sure that someone that was supposed to come in to look at your house actually came in you would want to make sure that the seal is broken.

I'd note the importance of making sure that you are using a lightly adhesive tape like scotch tape because a really strong adhesive could obviously pull some of the paint off the door or frame.

In the first picture you can see the piece of tape placed on the door and notice the small cuts on both sides. In the second and third, you can see the tear in the tape.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Share

    Recommendations

    • Indoor Lighting Contest

      Indoor Lighting Contest
    • Stone Concrete and Cement Contest

      Stone Concrete and Cement Contest
    • DIY Summer Camp Contest

      DIY Summer Camp Contest

    6 Discussions

    0
    None
    GrunambulaxTomV4

    Reply 4 years ago on Introduction

    This is why it's always important to line your hat with aluminum foil with the reflective side facing out.

    0
    None
    LunaEros

    4 years ago on Introduction

    Very good. This is a trick my father told me about that he used on me when I was little. It works very well. :)

    1 reply
    0
    None
    GrunambulaxLunaEros

    Reply 4 years ago

    it reminds me now of the scene from a James Bond movie where he uses a piece of hair on a door.