Electronic device uses sounds to calculate equations.

Designer Khalil Klouche has created a calculator for kids that is more playful and interactive. The gadget called Knock Knock is essentially a wooden block with the four math symbols: addition, subtraction, multiplication, and division.

To calculate a sum, the user must knock the number corresponding to the sign. For example if you want to add ‘5' to the equation, you must knock on the addition symbol five times. The answer is also responded in knocking sounds via the speaker.

Knock Knock is created using an Arduino board, contact microphones, and solenoids. The electronic device was first showcased at the exhibition ‘Touch!' for MUDAC (Museum of Design and Contemporary Art).

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