Today I will teach you how to make a simple anti-theft device, the structure is very simple.
step 1:
Fix the plastic sheet on the rope, the size of the plastic sheet is about 1cm*1.5cm
Step 2:
Connect the speaker (I used a light bulb) and the battery.
Step 3:
Put the plastic sheet between the positive electrode of the battery and the copper sheet, then the power will be cut off
Step 4:
Fix the battery and the horn (mine is a light bulb) on the wall, and fix the end of the wire without the plastic sheet to the door. When the door is opened, the horn (light bulb) will sound.
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