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Hey,

I was working with a LCD display but it doesn't worked. The LCD display only lights up 1 line. Is this a programming fault or a connecting fault.

Cekstuffertz
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Sydney, Australia
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It is probably either a connection fault or a programming error or both together.  smiley-wink

As most people on this forum can't read minds, it would be helpful if you post your code and/or circuit so we can help you.
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Code :/*
  LiquidCrystal Library - Hello World
 
 Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
 library works with all LCD displays that are compatible with the
 Hitachi HD44780 driver. There are many of them out there, and you
 can usually tell them by the 16-pin interface.
 
 This sketch prints "Hello World!" to the LCD
 and shows the time.
 
  The circuit:
 * LCD RS pin to digital pin 12
 * LCD Enable pin to digital pin 11
 * LCD D4 pin to digital pin 5
 * LCD D5 pin to digital pin 4
 * LCD D6 pin to digital pin 3
 * LCD D7 pin to digital pin 2
 * LCD R/W pin to ground
 * 10K resistor:
 * ends to +5V and ground
 * wiper to LCD VO pin (pin 3)
 
 Library originally added 18 Apr 2008
 by David A. Mellis
 library modified 5 Jul 2009
 by Limor Fried (http://www.ladyada.net)
 example added 9 Jul 2009
 by Tom Igoe
 modified 22 Nov 2010
 by Tom Igoe
 
 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/LiquidCrystal
 */

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
  // set up the LCD's number of columns and rows:
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.print("hello, world!");
}

void loop() {
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // print the number of seconds since reset:
  lcd.print(millis()/1000);
}



[url]http://arduino.cc/en/uploads/Tutorial/LCD_bb.png[img]
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As the sketch is not something you wrote I would expect that that is correct.

Recheck your wiring and make sure that follows the circuit.

What is it that you can see on the display, is it just the 'hello, world!' part or the seconds counter, or is it just rubbish?
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As the sketch is not something you wrote I would expect that that is correct.

Recheck your wiring and make sure that follows the circuit.

What is it that you can see on the display, is it just the 'hello, world!' part or the seconds counter, or is it just rubbish?

It lights up one row but shows dont text.
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Please be clear to explain what you mean by:

Quote
It lights up one row but shows dont text.

'Lights up' has no meaning to me. Do you mean the backlight on the LCD or do you mean that all the pixels are on (ie, you see blocks of dark/light) or what?
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Seattle, WA USA
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There are people that hang out in other parts of the forum that specialize in LCDs. Perhaps asking in Displays, or asking a moderator to move this post, would get you better answers. The symptoms you describe are almost always a connection issue.
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Post a clear photo of your circuit, maybe we can see what is wrong.
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