Knock Knock Calculator

Laura Cochrane

I'm a DIY editor at Instructables and I used to be an editor at MAKE and CRAFT. I like hiking, biking, rock climbing, and etymology.

678 Articles

By Laura Cochrane

I'm a DIY editor at Instructables and I used to be an editor at MAKE and CRAFT. I like hiking, biking, rock climbing, and etymology.

678 Articles

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Knock Knock is a clever Arduino-controlled calculator toy, designed for small children. The user knocks out a calculation on the surface — addition, multiplication, subtraction, or division — and Knock Knock will spit back the solution, in the form of knocks, of course. Created by Switzerland designer Khalil Klouche, Knock Knock is brought to life with an Arduino, contact microphones, and solenoids. It’s a fun idea for a toy, but good luck trying to use this in secret during a “no calculators” test at school!

knock_knock
[via the Makeshift newsletter]

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