Top pinout (connector T1)
This is a relatively standard layout. If your module does NOT provide a negative voltage on pin
15, then install a shunt on J1.
If it does output a negative voltage on pin 15, you MUST remove J1 and wire A and K terminals
to the Header labeled “A” and “K” using external wires.
Note that some larger displays have 2 additional pins: 17 and 18. Generally pin 18 is a NC and
pin 17 provides a negative voltage. Pin 17 is connected to a solder pad, P17, for external use if
desired.
Standard Left pinout (connector L1)
This is the most common of the pinouts on the left side of the module.
Again, if your module does NOT provide a negative voltage on pin 15,
then install a shunt on J1.
If your module outputs a negative voltage on pin 15, you MUST remove
J1 and wire A and K terminals to the Header labeled “A” and “K” using
external wires.
Note for 8x2 modules: Most 8x2 modules don’t have pins 15 and 16.
Install the modules using the lower 14 pins. Also, the backlight will have
to be connected externally.
40x4 Left pinout (connector L2)
This is the other left handed pinout that is used on many, (but not all!!),
40 x 4 modules. Again, if your module does NOT provide a negative
voltage on pin 16, then install a shunt on J1.
If it does output a negative voltage on pin 15, you MUST remove J1 and
wire A and K terminals to the Header labeled “A” and “K” using external
wires. Also, note that this pinout uses an additional Enable line, E1. The
EDP-I software will automatically enable this when the 40x4 module is
selected.
If your 40x4 module doesn't match this pinout, you'll have wire an adapter cable.
