Arduino Uno Quick Start Manual page 82

Now open a new tab, and when asked for a filename, enter
will create a good old C header file. (To be precise, it will even be a C++
header file.)
TelegraphLibrary/telegraph.h
#ifndef __TELEGRAPH_H__
#define __TELEGRAPH_H__
class Telegraph {
public:
Telegraph(const int
void send_message(const
private:
void dit();
void dah();
void output_code(const
void output_symbol(const int
int _output_pin;
int _dit_length;
int _dah_length;
};
#endif
Ah, obviously object-oriented programming is not only for the big CPUs any-
more! This is an interface description of a
in your next enterprise project (provided that you need to transmit some
information as Morse code, that is).
We start with the classic double-include prevention mechanism; that is, the
body of the header file defines a preprocessor macro named
We wrap the body (that contains this definition) in an
is only compiled if the macro has not been defined. That way, you can include
the header as many times as you want, and the body will be compiled only
once.
The interface of the Telegraph
class have access to and a private part that only members of the class can
use. In the public part, you find two things: a constructor that creates new
Telegraph objects and a method named
emitting it as Morse code. In your applications, you can use the class as fol-
lows:
Telegraph telegraph(13, 200);
telegraph.send_message("Hello,
output_pin, const int
char* message);
char* code);
length);
Telegraph
class consists of a public part that users of the
send_message
world!");
www.it-ebooks.info
Building a Morse Code Generator
telegraph.h
dit_length);
class that you could use
__TELEGRAPH_H__
#ifndef so that the body
that sends a message by
63
. Yes, we
.
report erratum discuss