Problem with I2C/TWI LCD2004 Module
Aklain 2013-03-08 09:49:25 5809 Views7 Replies Hi all,
I have a problem with DFRobot I2C LCD 20x4. He only display two white line. I use the DFRobot library and Romeo V2.
Bellow, code used:
[quote]//DFRobot.com
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x20,20,4);
void setup()
{
lcd.init(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
lcd.print("Hello, world!");
}
void loop()
{
}[/quote]
Thanks
I have a problem with DFRobot I2C LCD 20x4. He only display two white line. I use the DFRobot library and Romeo V2.
Bellow, code used:
[quote]//DFRobot.com
//Compatible with the Arduino IDE 1.0
//Library version:1.1
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x20,20,4);
void setup()
{
lcd.init(); // initialize the lcd
// Print a message to the LCD.
lcd.backlight();
lcd.print("Hello, world!");
}
void loop()
{
}[/quote]
Thanks
2013-03-10 17:23:02 Glad to see the problem has been sorted! Share your project with us if you like! 
R2D2C3PO
R2D2C3PO 2013-03-10 09:09:18 My problem is resolved.
I thought that the RomeoV2 have pullup resistors on SCL and SDA but no. With the resistors, it work.
Thank you. Aklain
I thought that the RomeoV2 have pullup resistors on SCL and SDA but no. With the resistors, it work.
Thank you.
Aklain 2013-03-10 07:09:14 have you adjusted the potentiometers? If this not helps, it may be a faulty item. Please contact [email protected] for replacement. R2D2C3PO
R2D2C3PO 2013-03-09 02:21:18 Hi
Please check weather the jumper caps of the back small board match with address. The wiki Doc has update,see
[url=https://www.dfrobot.com/wiki/index.php/I2C_TWI_LCD2004_Module_(Arduino/Gadgeteer_Compatible)_(SKU:DFR0154)]https://www.dfrobot.com/wiki/index.php/I2C_TWI_LCD2004_Module_(Arduino/Gadgeteer_Compatible_(SKU:DFR0154)[/url])
Good luck ;) Phoebe
Please check weather the jumper caps of the back small board match with address. The wiki Doc has update,see
[url=https://www.dfrobot.com/wiki/index.php/I2C_TWI_LCD2004_Module_(Arduino/Gadgeteer_Compatible)_(SKU:DFR0154)]https://www.dfrobot.com/wiki/index.php/I2C_TWI_LCD2004_Module_(Arduino/Gadgeteer_Compatible_(SKU:DFR0154)[/url])
Good luck ;)
Phoebe 2013-03-09 00:55:37 Thanks for your help but add lcd.setCursor(0, 0); don't work :(
New code :
[quote]#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x20,20,4);
void setup()
{
lcd.init();
lcd.backlight();
}
void loop()
{
lcd.setCursor(0,0);
lcd.print("Hello, world!");
}[/quote] Aklain
New code :
[quote]#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x20,20,4);
void setup()
{
lcd.init();
lcd.backlight();
}
void loop()
{
lcd.setCursor(0,0);
lcd.print("Hello, world!");
}[/quote]
Aklain 2013-03-08 18:15:32 Hi,
I think maybe you omit something in your code, may be you should add the cursor setting, such as '' lcd.setCursor(0, 0);'' ;)
Best regards Phoebe
I think maybe you omit something in your code, may be you should add the cursor setting, such as '' lcd.setCursor(0, 0);'' ;)
Best regards
Phoebe 