Dan Watson created an Arduino-compatible Cherry MX keypad with an Atmel ATmega32U4 microcontroller:
Custom Cherry MX Keypad
The design files and source code are shared on GitHub:
/CherryMX_Keypad
SyncChannelBlog has shared the board on OSH Park:
Cherry MX Keypad
OSH Park 
[…] Drew also posted about it on Oshpark. […]
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