Arduino uno User Manual

Because we’ve encapsulated the whole Morse code logic in the Telegraph class,
our main program is short and concise. Creating software for embedded
devices doesn’t mean we can’t benefit from the advantages of object-oriented
programming.
Still, we have some minor things to do to turn our project into a first-class
library. Read more about it in the next section.
Publishing Your Own Library
One of the nice features of the Arduino IDE is its syntax coloring. Class names,
function names, variables, and so on all have different colors in the editor.
This makes it much easier to read source code, and it’s possible to add syntax
coloring for libraries. You only have to add a file named keywords.txt to your
project:
TelegraphLibrary/keywords.txt
# Syntax-coloring for the telegraph library
Telegraph KEYWORD1
send_message KEYWORD2
Blank lines and lines starting with a # character will be ignored. The
remaining lines contain the name of one of the library’s members and the
member’s type. Separate them with a tab character. Classes have the type
KEYWORD1 , while functions have the type KEYWORD2 . For constants, use LITERAL1 .
To enable syntax coloring for the telegraph library, copy keywords.txt to the
libraries/Telegraph folder and restart the IDE. Now the name of the Telegraph class
will be orange, and send_message will be brown.
Before you finally publish your library, you should add a few more things:
• Store all example sketches in a folder named examples and copy it to the
libraries/Telegraph folder. Every example sketch should get its own subdirec-
tory within that folder.
• Choose a license for your project and copy its terms into a file named
LICENSE .
3
You might think this is over the top for many libraries, but it will
give your potential audience confidence.
• Add installation instructions and documentation. Usually, users expect
to find documentation in a file named README , and they will look for
installation instructions in a file named INSTALL . You should try to install
3. At http://www.opensource.org/ , you can find a lot of background information and many
standard licenses.
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Arduino uno Specifications

General

Form factor	Arduino
Certification	RoHS, FC, CE
Processor model	-
Processor frequency	- MHz
Microcontroller model	ATmega328
Microcontroller frequency	16 MHz
DC input voltage	7-12 V
Operating voltage	5 V
DC current per I/O pin	40 mA
Flash memory	0.032 MB
Maximum internal memory	- GB
SRAM (Static Random Access Memory)	2 KB
EEPROM (Electrically Erasable Programmable Read-Only Memory)	1 KB
Wi-Fi	No
Number of analog I/O pins	6
Number of digital I/O pins	14

Weight and Dimensions

Board dimensions	53.4 x 68.6 mm