Newhaven 4x40 LCD, issues!

[MOUNTAIN747]

Christopher, I had all my wiring correct and the code looked good but I still had no display. The problem was Vo. The contrast was a critical adjustment. Once I found the sweet spot, just above 0 VDC, all was well.

I've attatched a txt file with the code to test the LCD using E1 & E2, no other hardware needed. R/W can be tied to GND or to an output. Make the necessary VAR pin assinment changes. This code will write to all four lines without using LCDOUT command.

Wayne

Newhaven_4x40_Test Code (1).txt