custom Library – multiple definitions

/var/folders/v0/xh4cnpz96rq5fw8nk7m1g0jw0000gp/T/arduino_build_43838/libraries/Keypad/Keypad.cpp.o: In function `Keypad::numKeys()':

/Users/elias/Documents/Arduino/libraries/Keypad/src/Keypad.h:81: multiple definition of `PCF'

/var/folders/v0/xh4cnpz96rq5fw8nk7m1g0jw0000gp/T/arduino_build_43838/sketch/test.ino.cpp.o:/Users/elias/Documents/Arduino/test/test.ino:33: first defined here

/Applications/Arduino.app/Contents/Java/hardware/tools/arm/bin/../lib/gcc/arm-none-eabi/4.8.4/../../../../arm-none-eabi/bin/ld: Disabling relaxation: it will not work with multiple definitions

collect2: error: ld returned 1 exit status

Fehler beim Kompilieren für das Board Teensy 3.6.

#include "PCF8574.h"

PCF8574 PCF(0x20);

#ifndef KEYPAD_H

#define KEYPAD_H

#include "Key.h"

#include "PCF8574.h"

PCF8574 PCF(0x20);

// bperrybap - Thanks for a well reasoned argument and the following macro(s).

// See http://arduino.cc/forum/index.php/topic,142041.msg1069480.html#msg1069480

#ifndef INPUT_PULLUP

#warning "Using  pinMode() INPUT_PULLUP AVR emulation"

#define INPUT_PULLUP 0x2

#define pinMode(_pin, _mode) _mypinMode(_pin, _mode)

#define _mypinMode(_pin, _mode)  \

do {               \

  if(_mode == INPUT_PULLUP)   \

    pinMode(_pin, INPUT);   \

    PCF.write(_pin, 1);   \

  if(_mode != INPUT_PULLUP)   \

    pinMode(_pin, _mode);   \

}while(0)

#endif

#define OPEN LOW

#define CLOSED HIGH

typedef char KeypadEvent;

typedef unsigned int uint;

typedef unsigned long ulong;

// Made changes according to this post http://arduino.cc/forum/index.php?topic=58337.0

// by Nick Gammon. Thanks for the input Nick. It actually saved 78 bytes for me. :)

typedef struct {

    byte rows;

    byte columns;

} KeypadSize;

#define LIST_MAX 10    // Max number of keys on the active list.

#define MAPSIZE 10    // MAPSIZE is the number of rows (times 16 columns)

#define makeKeymap(x) ((char*)x)

//class Keypad : public Key, public HAL_obj {

class Keypad : public Key {

public:

  Keypad(char *userKeymap, byte *row, byte *col, byte numRows, byte numCols);

  virtual void pin_mode(byte pinNum, byte mode) { pinMode(pinNum, mode); }

  virtual void pin_write(byte pinNum, boolean level) { PCF.write(pinNum, level); }

  virtual int  pin_read(byte pinNum) { return PCF.read(pinNum); }

  uint bitMap[MAPSIZE];  // 10 row x 16 column array of bits. Except Due which has 32 columns.

  Key key[LIST_MAX];

  unsigned long holdTimer;

  char getKey();

  bool getKeys();

  KeyState getState();

  void begin(char *userKeymap);

  bool isPressed(char keyChar);

  void setDebounceTime(uint);

  void setHoldTime(uint);

  void addEventListener(void (*listener)(char));

  int findInList(char keyChar);

  int findInList(int keyCode);

  char waitForKey();

  bool keyStateChanged();

  byte numKeys();

private:

  unsigned long startTime;

  char *keymap;

    byte *rowPins;

    byte *columnPins;

  KeypadSize sizeKpd;

  uint debounceTime;

  uint holdTime;

  bool single_key;

  void scanKeys();

  bool updateList();

  void nextKeyState(byte n, boolean button);

  void transitionTo(byte n, KeyState nextState);

  void (*keypadEventListener)(char);

};

#endif