It is even possible to change the mapping runtime after each key. However functionality there is no limit how one wants to use the key mapping. In the examples above a 'space' key might be just meant to ignore. GetLastChar() as these would return meaningless bytes.Ĭhar normal_keymap = "123A456B789C*0#DNF " // typical normal key map (phone layout) char repeat_keymap = "1234123412341234NF " // effectively 4 identical columns char partial_keymap = "1234 NF " // top row char diag_keymap = "1 2 3 4NF " // diagonal keys only If there is no key map loaded the user should NOT call getChar() or This array maps index 0.15 on a char and index maps to I2CKEYPAD_NOKEY (typical 'N')Īnd index maps I2CKEYPAD_FAIL (typical 'F'). bool loadKeyMap(char * keyMap) keyMap should point to a (global) char array of length 19. ![]() char getLastChar() returns the last char pressed.char getChar() returns the char corresponding to mapped key pressed.LoadKeyMap() must be called before getChar() and getLastChar()! Not real matrix, connect pins to switch to GND. a 4x3 keypad can be read in mode 4x4 or in mode 5x3. There are 4 modi supported, and every mode also supports smaller keypads.Į.g. uint8_t getKeyPadMode() returns the current mode.This mode can also be used for 4x3 or 4x2. void setKeyPadMode(uint8_t mode = I2C_KEYPAD_4x4) sets the mode, default 4x4.However it is not checked if multiple keys are pressed. bool isPressed() Returns true if one or more keys of the keyPad is pressed,.uint8_t getLastKey() Returns the last valid key pressed 0.15.Returns 16 if no key is pressed and 17 in case of an error. uint8_t getKey() Returns default 0.15 for regular keys,.bool isConnected() returns false if the PCF8574 cannot be connected to.The return value shows if the PCF8574 with the given address is connected properly. ![]() bool begin(uint8_t sda, uint8_t scl) for ESP32.bool begin() The return value shows if the PCF8574 with the given address is connected properly. ![]() The constructor sets the device address and optionally
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