problem with lcd 16*2

cpmomo

New member
hello
I have the display lcd cfah1602b-ymi-jtk
black and orange
I have wired it following this outline
http://www.eio.com/lcd2014.gif
but I have not put the potenziometro from 100ohm if use the program of 4 tests to bit looks at instead all if I put to 8 bit from all strange characters like $
why ago therefore?
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