下面内容就是，自己保存成 LCD4Bit_mod.h 就可以了

#ifndef LCD4Bit_mod_h

#define LCD4Bit_mod_h

#include <inttypes.h>

class LCD4Bit_mod {

public:

LCD4Bit_mod(int num_lines);

void commandWrite(int value);

void init();

void print(int value);

void printIn(char value[]);

void clear();

//non-core---------------

void cursorTo(int line_num, int x);

void leftScroll(int chars, int delay_time);

//end of non-core--------

//4bit only, therefore ideally private but may be needed by user

void commandWriteNibble(int nibble);

private:

void pulseEnablePin();

void pushNibble(int nibble);

void pushByte(int value);

};

#endif