Introduction: Entrance Prohibited Alarm

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This is an alarm you can put in front a dangerous place, when you get close to it, it will sounds.

Step 1: Connect the Wires.

Step 2: The Coding

https://create.arduino.cc/editor/turtlelin/d291daea-0673-46a4-a21f-b4a7aa3de3d8/preview

Step 3: Done!