I am trying to setup a 4x40 display. My understanding is that it functions like 2 - 40x2 displays.
Using the LiquidCrystal library it uses the 4 bit mode instead of the 8 bit mode.
Should I have wired the unused inputs on the display to ground?
At present all I get is both halves of the display the upper line is all solid blocks, and the second line is blank.
Got hold of a copy of LiquidCrystal440 library and had to use Arduino022.
Initially I had not connected RW to anything, but things started working when I connected it to ground.
QuoteShould I have wired the unused inputs on the display to ground?This is one of the great mysteries of life but the general consensus is that it is unnecessary.
Ressurecting an old thread, I know, but the LiquidCrystal440 library works seamlessly with an old leftover 'dual 2x40' I dug out of the basement.