Matrix-orbital LK404-25 Manual do Utilizador descarregar pdf (Página 14)

Keypad Header

Figure 11: Keypad Header

Table 8: Keypad Pinout

Function

Gnd

Column 1

Row 1

Column 2

Row 2

Column 3

Row 3

Column 4

Row 4

Column 5

Row 5

Gnd/Vcc*

To facilitate user input, the LK404-25 provides a Keypad Interface Connector which allows a matrix style

keypad of up to twenty-five keys to be directly connected to the display module. Key presses are

generated when a short is detected between a row and a column. When a key press is generated, a

character specific to that key press is automatically sent on the Tx communication line. If the display

module is running in I²C mode, the “Auto Transmit Keypress” function may be turned off to allow the

key presses to remain in the buffer so that they may be polled. The character that is associated with

each key press may also be altered using the “Assign Key Codes” command. The straight twelve pin

header of the Keypad Interface Connector will interface to a variety of different devices including the

Matrix Orbital KPP4x4 keypad.

*Note: The Ground / +5V pin is toggled by the jumper to the right of the keypad connector. Jump pads 1 & 2 for

+5V or 2 & 3 for GND.

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Matrix-orbital LK404-25 Manual do Utilizador Página 14