Sometimes, emoji symbols come in handy, but I can never remember the relevant Unicode keycodes. I solved this by creating a mini-keyboard with buttons for my favorite unicode characters.
The keyboard sequences to input Unicode characters varies by Operating System, and the current implementation works only for Linux, but support may be added later for Windows or Mac. (There are some comments in the code about making this work on other platforms).
It was built with a Teensy (2.0), and the Arduino code is based off of the KeyboardMessage tutorial.
Unicode characters available are defined in keycodes.h. If a symbol you want
is not present, feel free to add it.
The config.h file contains an array called KEYMAP which can be
modified to output symbols of your choice. When a pin goes LOW, the
character at that index of KEYMAP is output.
The circuit relies on the built-in pullup resistors in the Teensy (most arduino models also support this). Simply connect ground to one side of your pushbutton, and an input pin to the other. Repeat for each entry in the KEYMAP array.
- multi-platform support
- autogen Unicode code point header