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Use ‘secret knocks’ to enter a room!

I was watching Stranger Things Season 2, there was a scene where one of the characters in the show was using a secret knock on the door to let the other person in the house know it was him.

At this point, I know I have a peculiar interest in making very ‘puzzling’ projects haha 🤣

Then I recalled I have a digital/analog sound sensor lying around. Hence, this project was created in a span of three days!

I really hope someone could implement it much better than I do since I have very limited resources (and space in the house) to do this.

Do watch the video below to see how it works!”

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