ian688t6 / KeyMatrix

KeyMatrix is poll event Arduino library for matrix keypads.

KeyMatrix

KeyMatrix is poll event Arduino library for matrix keypads.

Example Usage

// initialize the keypad with the Arduino pins (AK-304 is a common phone keypad)
AK_304(keypad, 4, 5, 6, 7, 8, 9, 10);

// OR for other phone keypads
KEY_MATRIX_PHONE(keypad, r0, r1, r2, r3, c0, c1, c2)

// OR for generic keypads (up to 32 keys)
char keymap[2][3] = {{'a', 'b', 'c'}, {'d', 'e', 'f'}};
byte rowPins[2] = {r0, r1};
byte colPins[3] = {c0, c1, c2};
KeyMatrix keypad(keymap, 2, 3, rowPins, colPins);

void loop() {
    // check for pending event
    if (keypad.pollEvent()) {
        // event data is stored on keypad.event
        if (keypad.event.type == KM_KEYDOWN && keypad.event.c == 'a') {
            // do something if key 'a' is pressed
        }
    }
}

See examples for more.