LCD only shows on Left half

Using Arduino Displays
1

Hi Forum Experts

I am testing a 16x2 LCD but the LCD only displays on the left half of the screen. Below is a sketch I am using to test. Am I missing something or is the hardware buggered ? Ive searched the forum but no similar issues that I can find unless I am just an idiot. Contrast works OK, No wierd characters, Right half simply just doesnt show any characters. I tired uploading an image but I keep getting an error.

// Sketch to scroll characters onto an LCD screen
#include <LiquidCrystal.h> //See note in text about what is needed here, i.e., LiquidCrystal.h enclosed inside
// greater thanand less than symbols
// This site often removes greater than and less than symbols and the text between them
// LiquidCrystal (rs, enable, d4, d5, d6, d7)
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
// Declare lcd as a LiquidCrystal Object
int i = 0;
int j = 0;
int k = 0;
int delayTime2 = 350; // Delay between shift
void scrollInFromRight (int line, char str1[])
{
  // Written by R. Jordan Kreindler June 2016
  i = strlen(str1);
  for (j = 16; j >= 0; j--) 
  {
    lcd.setCursor(0, line);
    for (k = 0; k <= 15; k++) 
    {
      lcd.print(" "); // Clear line
    }
    lcd.setCursor(j, line);
    lcd.print(str1);
    delay(delayTime2);
  }
}

void scrollInFromLeft (int line, char str1[]) {
  // Written by R. Jordan Kreindler June 2016
  i = 40 - strlen(str1);
  line = line - 1;
  for (j = i; j <= i + 16; j++)
  {
    for (k = 0; k <= 15; k++)
    {
      lcd.print(" "); // Clear line
    }
    lcd.setCursor(j, line);
    lcd.print(str1);
    delay(delayTime2);
  }
}



void setup() 
{
  Serial.begin(9600);
  Serial.println("Starting test ...");
  lcd.begin(16, 2);
  lcd.clear();
  lcd.print("Test Only");
}

void loop() 
{
//  lcd.clear();
//  scrollInFromRight(0, "Line1 From Right");
//  scrollInFromRight(1, "Line2 From Right");
//  lcd.clear();
//scrollInFromLeft(0, "Line1 From Left.");
//  scrollInFromLeft(1, "Line2 From Left.");
//  lcd.clear();
//  scrollInFromRight(0, "Line1 From Right");
//  scrollInFromLeft(1, "Line2 From Left.");
//  lcd.clear();
}
2

LCD
LCD1920×1440 249 KB

managed to upload with a different browser

3

Looks like it to me.

1 Like
4

Bummer thanks for confirming.

5

Try to run it as 8x4 to check if something will show up in the right half.

I have a few displays with the 16x1 layout, that must be programmed as 8x2 to work.

Check these for more info:

6

Nope still dead. Thanks for the info. Luckily these LCDs are really cheap Ill grab another to check. Was thinking of doing I2C in any-case to clean up the wiring. Since I am using a nano every I have very limited pins

7

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