Neither of the links in reply #1 is relevant to this thread.
- The first one uses a parallel interface.
- The second one uses an I2C adapter interface.
I currently have Pin K attached to the 5V output of the Due via a 220 ohm resistor. I have Pin A attached to the ground of the Due. This should at least make the backlight turn on, right?
Wrong! They are reversed. The anode (A) should go to 5V and the cathode (K) to GND. The resistor can go in either lead.
The other connections look OK.
Don