Jp3141 decided traditional numeric keypad was far too efficient and the rotary dialer from an old AT&T Trimline phone would make any Excel spreadsheet or other data entry task far more enjoyable.

Teensy’s HID functionality makes it a great candidate for your latest rad keyboard project, but as we’ve covered elsewhere, this double-edged sword also means it’s perfect for all manner of bizarre prank input devices as well.

A Teensy 3.x or LC is used to read the pulses from the dialer, then convert the positive pulses to the corresponding number and send the keystroke via USB as if it were a normal keyboard. STL files for the enclosure and source code can be found in the project’s GitHub repo, and you can watch (thankfully only) the first six digits of pi being entered in the video below!