AnalogKeypad

Library for (Robotdyn) 4x4 and 4x3 analog keypad

Description

AnalogKeypad is a simple library to read the keys from a (robotdyn) 4x4 or 4x3 keypad. No other keypads are tested, but they should work with this library after adjusting the MAGIC NUMBERS in the function rawRead().

Interface

Constructor

AnalogKeypad(pin) constructor, pin is typical A0 etc

polling interface

pressed() returns 0 if no key pressed, otherwise returns key pressed (may fluctuate)
read() read the key pressed returns 0..16

event interface

event() checks if a change has occurred since last time.
key() returns the key involved with last event

Switch(int e = event())

Event	value
PRESSED	0x80
RELEASED	0x40
REPEATED	0x20
CHANGED	0x10
NOKEY	0x00

Operation

The simplest usage is to use the read() function. This will return a 0 (NOKEY) when no key is pressed and a number 1 to 16 for the keys pressed. Note the return value may fluctuate randomly when multiple keys are pressed.

The pressed() function is a bit more robust. It returns the key pressed first, so multiple key presses simultaniously are less likely to disturbe your program.

See Examples

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