KNOCK KNOCK wooden box calculator for kids by Khalil Klouche

"The interactive wooden box lets you “knock” out math problems by using the standard arithmetic symbols displayed on the device. Using an Arduino board, contact microphones, and solenoids, you “knock” the math problem and it sounds the answer back to you."

Si no lo veo no lo creo. MaraBilloso y sorprendente. 

Visto en... DESIGN MILK 

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