How to erase these 2 symbols on LCD2004A?

Projects Programming
1

I got 2 bit pattern symbols at the end of the second line after lcd.print(" %");, When I run lcd.print(" \n"); after lcd.print(" %"), it wouldn't disappeared, and would attach another 3 this symbols after a space, why and how to remove these?

IMAG1297
IMAG12971920×2757 268 KB

2

How could we know? No sketch!

Oh nevermind then :upside_down_face:

3

use print instead of println.
print (" \n") will also print this line - so why do you send \n when you dont need them?

P.S.: it seems to be LCD2004 ... 20 characters, 4 lines. You can correct your thread header.

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4

It is not clear from your description but it seems that you are trying to print a '\n' (newline) character which will not work on an LCD

Instead, use the setCursor() function to position the cursor before printing the data

If you still have a problem then please post your full sketch, using code tags when you do

5

Hi, @MianQi

You need to look at some Examples that come with the library you are using to see the instruction set they use.

A copy of your complete code would help.

Tom.... :smiley: :+1: :coffee: :australia:

6

here is my code:

        lcd.setCursor(0, 0);
        lcd.print("Temperature: ");
        lcd.print(temperature);
        lcd.print("\337C");
        //lcd.print(" °C");
        lcd.setCursor(0, 1);
        lcd.print("Humidity: ");
        lcd.print(humidity);
        lcd.println(" %");
        lcd.setCursor(0, 2);
        lcd.blink();
7

And the probable solution is in posts #3 and #4. Did you try it?

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8

In order to "remove" them, you need to overwrite them with a SPACE character. You can avoid this by making the temperature and humidity values a fixed width so your degC and % symbols don't need to move. For example if your temperature changed from 10 to 9, then when you display the 9, display a space before it.

Once you have your display text setup, you can then just setCursor to the value position and overwrite it rather than displaying the associated text as well.

9 
 lcd.println(" %");

Don't use println() as the LCD cannot interpret the Carriage Return and/or Linefeed that it outputs. Use print() instead and position the cursor using setCursor()

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