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Я новичек, вот помигал диодами, приобрел ЛСД шилд и застрял, пытался подклбчить по  http://www.youtube.com/watch?v=JDoTn1sLxWQ&feature=channel&list=UL

Вот, собственной мой скетч

/*
Проверка работы экрана, 
на экране должна быть надпись и тикать счетчик
*/
#include <LCD4Bit_mod.h> // как я понимаю, подключение библиотеки
LCD4Bit_mod lcd = LCD4Bit_mod(2); // активация двух строк

int count = 0; // назначаем переменную
char outputCount[16]; // количество символов

vold setup() { // собственно начало
lcd.init(); //инициализация дисплея
lcd.clear(); //очистка дисплея
lcd.printIh("Displey Test"); // вывод фигни
}

void loop() {
lcd.cursorTo(2,0); //указываем где печатать, второй ряд, нулевая строка 
itoa(count, outputCout,10); // че за фигня, пока не разобрался
lcd.printIn(outputCount); //печать оутпута
count++; // прибаление оутпута на 1
}

но при компиляции пишет ошибку 

LCD4Bit_mod.cpp:29:57: error: WConstants.h: No such file or directory
LCD4Bit_mod.cpp: In member function 'void LCD4Bit_mod::pulseEnablePin()':
LCD4Bit_mod.cpp:57: error: 'LOW' was not declared in this scope
LCD4Bit_mod.cpp:57: error: 'digitalWrite' was not declared in this scope
LCD4Bit_mod.cpp:58: error: 'delayMicroseconds' was not declared in this scope
LCD4Bit_mod.cpp:60: error: 'HIGH' was not declared in this scope
LCD4Bit_mod.cpp:63: error: 'delay' was not declared in this scope
LCD4Bit_mod.cpp: In member function 'void LCD4Bit_mod::pushNibble(int)':
LCD4Bit_mod.cpp:72: error: 'digitalWrite' was not declared in this scope
LCD4Bit_mod.cpp: In member function 'void LCD4Bit_mod::commandWriteNibble(int)':
LCD4Bit_mod.cpp:98: error: 'LOW' was not declared in this scope
LCD4Bit_mod.cpp:98: error: 'digitalWrite' was not declared in this scope
LCD4Bit_mod.cpp: In member function 'void LCD4Bit_mod::commandWrite(int)':
LCD4Bit_mod.cpp:105: error: 'LOW' was not declared in this scope
LCD4Bit_mod.cpp:105: error: 'digitalWrite' was not declared in this scope
LCD4Bit_mod.cpp: In member function 'void LCD4Bit_mod::print(int)':
LCD4Bit_mod.cpp:117: error: 'HIGH' was not declared in this scope
LCD4Bit_mod.cpp:117: error: 'digitalWrite' was not declared in this scope
LCD4Bit_mod.cpp:118: error: 'LOW' was not declared in this scope
LCD4Bit_mod.cpp: In member function 'void LCD4Bit_mod::clear()':
LCD4Bit_mod.cpp:138: error: 'delay' was not declared in this scope
LCD4Bit_mod.cpp: In member function 'void LCD4Bit_mod::init()':
LCD4Bit_mod.cpp:145: error: 'OUTPUT' was not declared in this scope
LCD4Bit_mod.cpp:145: error: 'pinMode' was not declared in this scope
LCD4Bit_mod.cpp:153: error: 'delay' was not declared in this scope
LCD4Bit_mod.cpp:159: error: 'delayMicroseconds' was not declared in this scope
LCD4Bit_mod.cpp: In member function 'void LCD4Bit_mod::leftScroll(int, int)':
LCD4Bit_mod.cpp:224: error: 'delay' was not declared in this scope

 как я понимаю, скетч совершенно неверный, много чего не обьявлено 
Да, дисплей 16 на 2