Newbie - Trouble with LCD and "Hello World" sketch.

Using Arduino Programming Questions
1

Hi,

Just got my first Uno -rev3 with LCD ultrasonic kit from 4tronix. I have uploaded the lcd example code to the uno but nothing happens. The upload completes successfully and i have tested with the simple blink and fade led sketch both of which work so i guess the programming link etc is working correctly.

My lcd is the standard 16x2 and the pins are linked as per the example sketch. The screen lights up (both backlight and i can adjust the contrast to display all the pixels (the lcd is white on blue)

I have tested each of the links are connected at both ends (using ohm test meter) so the connections look sounds as well. Can anyone offer any advice on further tests/checks i can make.

Thanks

2

I have uploaded the lcd example code to the uno but nothing happens.

You should have posted this in the Psychic section of the forum, where they are better at guessing what code you are talking about. Here, we're just a bunch of dim wits that need to be shown the code.

3

Sorry i wasnt that clear Paul,

The code is the "LiquidCrystal Library - Hello World" from the arduino ide example section. windows version 1.0.3 - i can paste the code if that helps

4

i can paste the code if that helps

Yes, it would.

5

PaulS:

I have uploaded the lcd example code to the uno but nothing happens.

You should have posted this in the Psychic section of the forum...

I think then majority of post would be in that section along-with you and me :grin:

6

I think then majority of post would be in that section along-with you and me

Not me. I'm not psychic. Psychotic, maybe. 8)

7

You will be there in that forum..because you enjoy posting in such threads $)...and i will, because i enjoy your posts :grin: i am psychic because i enjoy your posts..so what you think You are...the creator of such posts that i enjoy ]:smiley:

8

I have checked the LCD on the raspberrypi and it works without issues, so i know the hardware is good.

the example code i have been using:
/*
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.

*/

// 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);
}