Arduino uno User Manual

Figure 14—Find the sketchbook location in the Preferences.
TelegraphLibrary/examples/HelloWorld/HelloWorld.ino
#include "telegraph.h"
const unsigned int BAUD_RATE = 9600;
const unsigned int OUTPUT_PIN = 13;
const unsigned int DIT_LENGTH = 200;
Telegraph telegraph(OUTPUT_PIN, DIT_LENGTH);
void setup() {
Serial.begin(BAUD_RATE);
}
void loop() {
telegraph.send_message("Hello, world!");
delay(5000);
}
This sketch emits the string “Hello, world!” as Morse code every five seconds.
To achieve this, we include the definition of our Telegraph class, and we define
constants for the pin our LED is connected to and for the length of our dits.
Then we create a global Telegraph object and an empty setup function. In loop ,
we then invoke send_message on our Telegraph instance every five seconds.
When you compile this sketch, the Arduino IDE automatically compiles the
telegraph library, too. If you forgot to copy the library files to the libraries/Telegraph
folder, you’ll get an error message such as “Telegraph does not name a type.”
Chapter 4. Building a Morse Code Generator Library • 68
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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