Arduino uno User Manual

Figure 25—You can find good online editors for pixel graphics.
When ImageMagick is available on your system, you can install the rmagick
library using the following command:
maik> gem install rmagick
Now you can use rmagick in your Ruby programs. We’ll use it to convert a
graphics file into a C++ file:
Video/img2cpp.rb
require 'RMagick'
Line 1
include Magick
-
-
image = Image::read(ARGV[0]).first
-
5
puts '#include "thermometer.h"'
-
puts 'PROGMEM const unsigned char thermometer[] = {'
-
puts " #{image.columns}, #{image.rows},"
-
-
(0..image.rows).each do |y|
10
print ' B'
-
(0..image.columns).each do |x|
-
pixel = image.pixel_color(x, y)
-
print pixel.red == 0 ? '0' : '1'
-
print ', B' if (x + 1) % 8 == 0
15
Chapter 8. Generating Video Signals with an Arduino • 142
report erratum • discuss
www.it-ebooks.info

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