HD44780 Module Schematic

The sales page says to change out the 0 Ohm resistor to adjust contrast. If I inspect the module (v1.0) there are two 0 Ohm resistors (R2 & R4). If I then look at the schematic, there is only an R2. I assume R2 is still the right one to change but I have no idea what R4 is doing… Do I have an outdated module version or is the schematic out of date or wrong?

Interesting, yeah, the schematic doesn’t have R4 or the DNP R3 .

I think it’s R1, the other not-placed resistor, and R2, that you’ll change.

@ ianlee74 - We will be looking at this today.