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You are most likely sending nonstandard/unsupported characters to the LCD. Try turning off "line endings" in the serial monitor.
Avoid using Strings with Arduino, as they cause memory problems and program crashes.
I have moved your topic to an appropriate forum category @YanMyoMaw.
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Thanks in advance for your cooperation.
This.
Neither the LiquidCrystal library nor the LCD hardware understand line ending characters. i.e. newline/LineFeed and carriage return>
Newline/LineFeed is character code 0xa and Carriage return is character code 0xd
The character code values 0x0 to 0x7 are for displaying 8 special custom user definable characters. (they are garbage by default at powerup)
Note that character values 0x8 to 0xf are a repeat of the custom character code points 0x0 to 0x7
So if you send a newline (character code 0xa) the library will pass the 0xa directly to the LCD chip and the LCD will print custom character 0x2
Likewise if you send CarriageReturn (character code 0xd) the library will pass the 0xd directly to the LCD chip and the LCD will print custom character 0x5
If you print a custom character before you have configured it, the character printed will be garbage since there are no default glyphs for the custom characters.
--- bill
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