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How a Keyboard Matrix Works | QMK Firmware How a Keyboard Matrix Works Keyboard switch matrices are arranged in rows and columns Without a matrix circuit, each switch would require its own wire directly to the controller When the circuit is arranged in rows and columns, if a key is pressed, a column wire makes contact with a row wire and completes a circuit The keyboard controller detects this closed circuit and registers it as a key press The microcontroller will be set up via the firmware to send a logical 1 to the columns, one