Select the key matrix you want to use, or build one. Then get a KeyWarrior28-MOD and connect them.
Make sure you have the proper pinout of the key matrix, so you know where the X and Y lines are. Connect the key matrix to the X and Y connections on the KeyWarrior28-MOD. No additional parts required.
The pinout of the KeyWarrior28-MOD can be found in the XW28-Datasheet
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Red - 5 V
Black - GND
Green - D+
White - D-
When you are done, connect the keyboard and download the KW28-Editor to program the functions for your keys.
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