Hi!
So the problem is that the LCD is lights up but it is nothing ˝written˝on display.
I'm pretty sure that I don't use the code properly, but I don't know what is wrong so I would like to ask for some help.
Arduino mega 2560
LCd IIC/I2C/TWI 1602 16X2
http://www.ebay.com/itm/251471058918?_trksid=p2060353.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT
It is connected: GND-GND, 5V-VCC, SDA-SDA(DI20), SCL-SCL(D21)
I'm using library: https://bitbucket.org/fmalpartida/new-liquidcrystal
/*
** Example Arduino sketch for SainSmart I2C LCD2004 adapter for HD44780 LCD screens
** Readily found on eBay or http://www.sainsmart.com/
** The LCD2004 module appears to be identical to one marketed by YwRobot
**
** Address pins 0,1 & 2 are all permenantly tied high so the address is fixed at 0x27
**
** Written for and tested with Arduino 1.0
** This example uses F Malpartida's NewLiquidCrystal library. Obtain from:
** https://bitbucket.org/fmalpartida/new-liquidcrystal
**
** Edward Comer
** LICENSE: GNU General Public License, version 3 (GPL-3.0)
**
** NOTE: TEsted on Arduino NANO whose I2C pins are A4==SDA, A5==SCL
*/
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27 // Define I2C Address where the PCF8574A is
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
int n = 1;
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
void setup()
{
lcd.begin (16,2);
// Switch on the backlight
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.home (); // go home
lcd.print("SainSmart I2C tester");
lcd.setCursor ( 0, 1 ); // go to the 2nd line
lcd.print("F Malpartida library");
lcd.setCursor ( 0, 2 ); // go to the third line
lcd.print("Test & demonstration");
lcd.setCursor ( 0, 3 ); // go to the fourth line
lcd.print("Iteration No: ");
}
void loop()
{
// Backlight on/off every 3 seconds
lcd.setCursor (14,3); // go col 14 of line 3
lcd.print(n++,DEC);
lcd.setBacklight(LOW); // Backlight off
delay(3000);
lcd.setBacklight(HIGH); // Backlight on
delay(3000);
}
Thanks a lot!
Jonathan
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