If you are interested in building your very own RPN calculator you might be interested in a new project published to the Instructables website this week by member Shiura. Using a CNC machine, the ...

[Paul Mandel] just finished building this knock box project. It’s a familiar concept that uses a solenoid to tap on the side of the box. The Arduino driven setup monitors vibrations on the lid. When ...

There’s not a single college in the country that will let you use this wooden calculator during an exam. And it’s not because it can be used for cheating. It has more to do with the fact that instead ...