I have downloaded the liquid crystal library from arduino(inbuilt come with arduino software) and run it on 20X4 alphanumeric LCD, its all ok but some time the display got disturbed like it shows some garbage data like chinese words and some times LCD’s 2nd and 4th line got dark and 1st and 3rd line clears but at this time controller operates as its normal operation i,e. internally controller do execution for LCD but LCD dont shows it.
I could’t understand whether it is software problem or hardware problem.
Because it goes normal by power reset not by controller reset.
Thanks in advance