Wiring the LCD
Since this is a parallel LCD, data will be sent to it over a parallel interface. That is, multiple bits at a time. These LCDs are designed for either a 8-bit or 4-bit interface. Since we'd like to save pins, lets go with the 4-bit interface! The data pins are name D4, D5, D6, and D7. Double-check your datasheet but almost all parallel LCDs have these pins numbered 4, 3, 2, and 1 respectively.| 1 (D7) | 2 (D6) |
|---|---|
| 3 (D5) | 4 (D4) |
| 5 | 6 |
| 7 | 8 |
| 9 (ENABLE) | 10 (R/W) |
| 11 (RS) | 12 (CONTRAST) |
| 13 (GND/VSS) | 14 (+5V/VDD) |
There's a lot of wiring to be done but we're going to go thru it very slowly so it shouldn't be too bad.
Since I wasnt sure of the wiring, I used the sockets on the protoshield. Once I test and verify they are correct, I'll solder them in!
Next are the two power wires. Parallel LCDs run off of +5V so you can just solder the Vcc wire to 5V and the ground wire to GND.
The last wire is the contrast control, we need to connect a potentiometer to this to make the display visible. I dont know the specifics of the input current but I used a 10K potentiometer and it worked great.
One pin is connected to +5V, the pin on the other side is connected to ground and the middle pin is connected to the contrast line.
Page last edited July 13, 2012
Text editor powered by tinymce.
