Knock Knock Calculator

Screen Shot 2013-05-07 at 10.51.45 AM

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. It's a fun idea for a toy,... Read more »

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