Interfacing with Liquid Crystal Displays - Exploring Arduino: Tools and Techniques for Engineering Wizardry - page 201

pins for enabling the display, setting the display to command mode or character
mode, and for setting it to read/write mode. Table 10-1 describes all of these pins.

Figure 10-1: LCD with Headers soldered on

Table 10-1: Parallel LCD Pins

PIN NUMBER PIN NAME PIN PURPOSE

1 VSS Ground connection

2 VDD +5V connection

3 V0 Contrast adjustment (to potentiometer)

4 RS Register selection (Character vs. Command)

5 RW Read/write

6 EN Enable

7 D0 Data line 0 (unused)

8 D1 Data line 1 (unused)

9 D2 Data line 2 (unused)

10 D3 Data line 3 (unused)

11 D4 Data line 4

12 D5 Data line 3

13 D6 Data line 6

14 D7 Data line 7

15 A Backlight anode

16 K Backlight cathode