This calculator uses a full 16 button matrix keypad. The Arduino deciphers button pushes with the help of the Keypad library, at which time the appropriate character is displayed on the 2×8 LCD ...

The Wireless Bluetooth Keypad Calculator connects to your netbook or notebook via Bluetooth, and has a built in standard numeric keypad and a 12 digit calculator.

This just in from the "if you can't beat 'em, join 'em" department: Since die hard calculator users refuse to toss those relics and use their onscreen counterparts, Casio has decided to take a ...