lcderror.ino

// C++ code
//
const int db4 = 13;
const int db5 = 12;
const int db6 = 11;
const int db7 = 10;
const int en = 9;
const int rs = 8;
void setup()
{
  pinMode(db4, OUTPUT);
  pinMode(db5, OUTPUT);
  pinMode(db6, OUTPUT);
  pinMode(db7, OUTPUT);
  pinMode(rs, OUTPUT);
  pinMode(en, OUTPUT);

  //send4bits(0,0,0,1,0);//4 bits mode enable
  //sendMachineCode(0,0,0,0,0,0,0,0,1);//clear screen
  //sendMachineCode(0,0,0,0,0,0,0,1,0);//return home
  //sendMachineCode(0,0,0,0,0,1,1,0,0);//display on, no cursor
  //sendMachineCode(1,0,1,0,0,1,0,0,0);//clear screen
  //sendMachineCode(1,0,1,0,0,1,0,0,1);//clear screen

  initlcd();


}

void loop()
{


}

void sendMachineCode(int rrs,int b7,int b6,int b5,int b4,int b3,int b2,int b1,int b0)
{

  send4bits(rrs,b0,b1,b2,b3);
  delay(3000);
  send4bits(rrs,b7,b6,b5,b4);
  delay(3000);

}

void send4bits(int rrs,int b7,int b6,int b5,int b4)
{
  digitalWrite(rs,rrs);
  digitalWrite(db4,b4);
  digitalWrite(db5,b5);
  digitalWrite(db6,b6);
  digitalWrite(db7,b7);

  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
}



void initlcd1()
{
  //4 bits mode
  digitalWrite(rs,0);
  digitalWrite(db5,1);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  //clear display
  digitalWrite(rs,0);
  digitalWrite(db4,0);
  digitalWrite(db5,0);
  digitalWrite(db6,0);
  digitalWrite(db7,0);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  digitalWrite(rs,0);
  digitalWrite(db4,1);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  //return home
  digitalWrite(rs,0);
  digitalWrite(db4,0);
  digitalWrite(db5,0);
  digitalWrite(db6,0);
  digitalWrite(db7,0);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  digitalWrite(rs,0);
  digitalWrite(db5,1);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  //display on no cursor
  digitalWrite(rs,0);
  digitalWrite(db4,0);
  digitalWrite(db5,0);
  digitalWrite(db6,0);
  digitalWrite(db7,0);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  digitalWrite(rs,0);
  digitalWrite(db6,1);
  digitalWrite(db7,1);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  //print H
  digitalWrite(rs,1);
  digitalWrite(db6,1);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  digitalWrite(rs,1);
  digitalWrite(db7,1);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  //print I
  digitalWrite(rs,1);
  digitalWrite(db6,1);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);

  digitalWrite(rs,1);
  digitalWrite(db4,1);
  digitalWrite(db7,1);
  digitalWrite(en,LOW);
  delay(10);
  digitalWrite(en,HIGH);
  delay(10);
  digitalWrite(en,LOW);
  delay(10);
}


void initlcd()
{
    // Initialize in 4-bit mode
    send4bits(0, 0, 1, 0, 0); // Function set: 4-bit mode, 2 lines, 5x8 font
    delay(5); // Wait for initialization

    // Display control: Display on, no cursor, no blinking
    sendMachineCode(0, 0, 0, 0, 1, 1, 0, 0, 0);

    // Clear display
    sendMachineCode(0, 0, 0, 0, 0, 0, 0, 0, 1);

    // Set entry mode: Increment cursor position, no display shift
    sendMachineCode(0, 0, 0, 0, 0, 0, 1, 1, 0);

  // Set cursor position to the first row, second column (0-based)
sendMachineCode(0, 0, 0, 0, 0, 1, 1, 0, 0);

// Print 'H'
sendMachineCode(1, 0, 1, 0, 0, 1, 0, 0, 0);

// Set cursor position to the first row, third column
sendMachineCode(0, 0, 0, 0, 0, 1, 1, 0, 1);

// Print 'I'
sendMachineCode(1, 0, 1, 0, 0, 1, 0, 0, 1);
}