Standalone T9 Keypad
By Guy Dupont
Read the usage instructions here.
Generate your own custom T9 library here.
Purchase here!! (limited supply)
If you have the DIY kit (or just the PCB), assembly instructions are here.
If you need to install the T9 firmware, check here.
Follow Guy on Twitter here.
Email Guy at gvy.dvpont@gmail.com.
Watch the YouTube video here.
See the Hackaday.io project page here.
Find the source code here.