A pcb key board built in 4x4 matrix form & includes columns pull ups.
driver to control n by m matrix keyboard with external pull-ups on columns
You can buy this component at: http://hotboards.mitiendanube.com/productos/keypad/
Also check its tutorial at Hotboards blog (only in spanish): http://hotboards.org/index.php/es/blog/30-spanish/blog/boards/149-teclado-matricial-con-arm-mbed
More example programs
This is a demonstration of keypadEvents. It's used to switch between keymaps while using only one keypad.
This sketch is an example of how you can get multiple key presses from a keypad or keyboard.
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