It’s a common problem for students when they leave classroom a thief can open his/her backpack ant stole something precious. So I made this project with my students for students. First we create a prototip look on Tinkercad. After that we use a tilt sensor, a buzzer, a tag reader and Arduino. We coded Arduino with Arduino IDE.

When student will leave classroom he/she reads tag to Arduino and so system activated. After that if anyone with out tag will tries to open backpack the alarm will activate and so thief will be panic and leave alone backpack.
I think that is a good project for anti-theft. So there will be no theft attempt to backpacks.
See you next project.