Package com.diozero.devices

Class Keypad

java.lang.Object

com.diozero.devices.Keypad

All Implemented Interfaces:

DeviceInterface, AutoCloseable

public class Keypad
extends Object
implements DeviceInterface

References:

• Connecting a 4x4 Membrane Keypad to an Arduino
• Arduino source code

Note, this class should be run with the mmap provider as it configures input pull-up registers, something that cannot be done with the sysfs provider unfortunately. You can of course wire it up with your own pull-up resistors.

Field Summary

Fields

Modifier and Type	Field	Description
static char	NO_KEY

Constructor Summary

Constructors

Constructor	Description
Keypad(int[] rowGpios, int[] colGpios, char[][] keys)

Method Summary

Modifier and Type	Method	Description
void	close()	Close this device
List<Character>	getKeys()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NO_KEY

public static final char NO_KEY

See Also:

Constant Field Values

Constructor Detail

Keypad

public Keypad(int[] rowGpios,
              int[] colGpios,
              char[][] keys)

Method Detail

getKeys

public List<Character> getKeys()

close

public void close()

Description copied from interface: DeviceInterface

Close this device

Specified by:

close in interface AutoCloseable

Specified by:

close in interface DeviceInterface