LCD_Meu

#include <LiquidCrystal.h>
LiquidCrystal lcd(6, 8, 9, 10, 11, 12);    //Ordem dos pinos RS EN D4 D5 D6 D7

#define  RS 6
#define  RW  7
#define  ENA 8
#define  DB7  9
#define  DB6  10
#define  DB5  11
#define  DB4  12
//------------------------------
void setup()
{
  Serial.begin(9600);
  pinMode( RS , OUTPUT);
  pinMode( RW , OUTPUT);
  pinMode(ENA, OUTPUT);
  pinMode( DB7 , OUTPUT);
  pinMode( DB6 , OUTPUT);
  pinMode( DB5 , OUTPUT);
  pinMode( DB4 , OUTPUT);
//    lcd.begin(16, 2);
  initLCD();
}
//----------------------------
void initLCD()
{
  delay(15);
  digitalWrite( ENA, LOW);
  digitalWrite( RS , LOW);
  digitalWrite( RW , LOW);

  write4bits(3);
  delayMicroseconds(4500); // wait min 4.1ms
  write4bits(3);
  delayMicroseconds(40); // wait min 4.1ms
  write4bits(3);
  delayMicroseconds(40);
  write4bits(2);
  delayMicroseconds(40);

  // 28
  write4bits(2);
  write4bits(8);
  delayMicroseconds(60); // wait min 4.1ms

  // 2E
  write4bits(0);
  write4bits(8);
  delayMicroseconds(60); // wait min 4.1ms

  // 2E
  write4bits(0);
  write4bits(1);
   delayMicroseconds(3000); // wait min 4.1ms

  // 2E
  write4bits(0);
  write4bits(6);

  // clear  0C
  write4bits(0);
  write4bits(0x0C);

  delay(500);

}
//------------------------
void loop()
{
 //     lcd.begin(16, 2);
 //    lcd.print("hello, world!");

  write4bits(3);
  write4bits(1);
  delay(500);
   write4bits(3);
  write4bits(2);
  delay(500);
  //  initLCD();
}
//-----------------------------------
void write4bits(byte value)
{
  digitalWrite( DB7 , (value ) & 0x01);
  digitalWrite( DB6 , (value >> 1) & 0x01);
  digitalWrite( DB5 , (value >> 2) & 0x01);
  digitalWrite( DB4 , (value >> 3) & 0x01);
  pulseEnable();
}
//-----------------------------------
void pulseEnable()
{
  digitalWrite(ENA, LOW);
  delayMicroseconds(1);
  digitalWrite(ENA, HIGH);
  delayMicroseconds(1);    // enable pulse must be >450ns
  digitalWrite(ENA, LOW);
  delayMicroseconds(100);   // commands need > 37us to settle
}