Name: Arduino Pro Mini
Brand: Arduino
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B00000010, B00000100, B00000000,

// ...

B00000010, B00000100, B00000000, // 5.5

B00000111, B11111110, B00000000,

B00001111, B11111111, B00000000,

B00011111, B11111111, B10000000,

B00111111, B11111111, B11000000,

B01111111, B11111111, B11100000,

B11111111, B11111111, B11110000,

B01111111, B11111111, B11100000,

B00111111, B11111111, B11000000,

B00011111, B11111111, B10000000,

B00001111, B11111111, B00000000,

B00000111, B11111110, B00000000,

B00000001, B11111000, B00000000,

};

This file looks weird at first, but it’s really simple. First, we include

Arduino.h

because we’ll need to declare binary constants later. After that, we include

avr/pgmspace.h

because we want to store our image data in the Arduino’s flash

RAM. Eventually, we include

thermometer.h

because we need the declaration of

our thermometer image data.

In line 4, we eventually define the

thermometer

variable we declared in

thermome-

ter.h

. The definition differs slightly from the declaration because it contains

the

PROGMEM

directive.

This directive tells the compiler to copy the data stored

in the

thermometer

variable to the Arduino’s flash memory. Usually, when you

define a variable in an Arduino program, it occupies memory in the SRAM.

Most Arduinos don’t have a lot of SRAM (the Arduino Uno only has 2 KB), so

it’s a valuable resource and you shouldn’t waste it. As a rule of thumb, you

should store all constant data in the Arduino’s flash RAM. Use SRAM only

for information that might change during program execution.

http://arduino.cc/en/Reference/PROGMEM

Chapter 8. Generating Video Signals with an Arduino • 140

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Brand	Arduino
Model	Pro Mini
Category	Motherboard
Language	English

Arduino Pro Mini User Manual

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