Arduino uno User Manual

Changing Preferences
For your early projects, the IDE’s defaults might be appropriate, but sooner
or later you’ll want to change some things. As you can see in the following
figure, the IDE lets you change only a few preferences directly.
The dialog box refers to a file named preferences.txt containing more preferences.
This file is a Java properties file consisting of key/value pairs. Here you see
a few of them:
...
preproc.web_colors=true
editor.font=Monaco,plain,10
update.check=true
build.verbose=true
upload.verbose=true
...
Most of these properties control the user interface; that is, they change fonts,
colors, and so on. But they can also change the application’s behavior. You
can enable more verbose output for operations such as compiling or uploading
a sketch. Before Arduino 1.0, you had to edit preferences.txt and set both
build.verbose and upload.verbose to true to achieve this. Today, you can change the
verbose settings from the Preferences dialog box. Make sure that verbose
output is enabled for compilation and upload. Also, it’s helpful to enable the
“Display line numbers” option.
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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