So the background for this is I am a teacher, and I am looking for a way to prevent students from leaving my classroom with calculators in their hands. I have this idea, not sure how feasable, but it sounds simple enough. I would like to have a door sensor that buzzes every time it senses a (lets c…

Door Sensor Alarm

hammy November 17, 2017, 7:32pm 10

Get big ugly calculators that they don’t like .

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