I tried the posted code with my Uno and a 1602 display and it works fine. It displays "hello, world" on the top line and the millis() count on the bottom line. Carefully check your wiring. Is the RW pin of the LCD (LCD pin 5) connected to ground?
I tried the posted code with my Uno and a 1602 display and it works fine. It displays "hello, world" on the top line and the millis() count on the bottom line. Carefully check your wiring. Is the RW pin of the LCD (LCD pin 5) connected to ground?