Standard HD44780-compatible character LCD module with 16 columns and 2 rows, white characters on a blue backlight. Suitable for simple status displays, menus, readouts, and breadboarded electronics projects.
Ground
LCD supply
LCD contrast input from potentiometer
Register select, command/data select
Read/write select, often tied low for write-only use
Enable clock input
Parallel data bit 0, unused in 4-bit mode
Parallel data bit 1, unused in 4-bit mode
Parallel data bit 2, unused in 4-bit mode
Parallel data bit 3, unused in 4-bit mode
Parallel data bit 4
Parallel data bit 5
Parallel data bit 6
Parallel data bit 7
Backlight LED anode
Backlight LED cathode
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VSSGND | 16-pin LCD header pin 1 | Ground | Ground | 0V |
| VDDVCC | 16-pin LCD header pin 2 | Power | LCD supply | 5V |
| VO | 16-pin LCD header pin 3 | Unknown | LCD contrast input from potentiometer | contrast voltage |
| RS | 16-pin LCD header pin 4 | Control | Register select, command/data select | logic input |
| RW | 16-pin LCD header pin 5 | Control | Read/write select, often tied low for write-only use | logic input |
| EEN | 16-pin LCD header pin 6 | Control | Enable clock input | logic input |
| D0 | 16-pin LCD header pin 7 | GPIO | Parallel data bit 0, unused in 4-bit mode | logic I/O |
| D1 | 16-pin LCD header pin 8 | GPIO | Parallel data bit 1, unused in 4-bit mode | logic I/O |
| D2 | 16-pin LCD header pin 9 | GPIO | Parallel data bit 2, unused in 4-bit mode | logic I/O |
| D3 | 16-pin LCD header pin 10 | GPIO | Parallel data bit 3, unused in 4-bit mode | logic I/O |
| D4 | 16-pin LCD header pin 11 | GPIO | Parallel data bit 4 | logic I/O |
| D5 | 16-pin LCD header pin 12 | GPIO | Parallel data bit 5 | logic I/O |
| D6 | 16-pin LCD header pin 13 | GPIO | Parallel data bit 6 | logic I/O |
| D7 | 16-pin LCD header pin 14 | GPIO | Parallel data bit 7 | logic I/O |
| LED+A | 16-pin LCD header pin 15 | Power | Backlight LED anode | 5V through module/resistor path |
| LED-K | 16-pin LCD header pin 16 | Power | Backlight LED cathode | 0V |
Ground
LCD supply
LCD contrast input from potentiometer
Register select, command/data select
Read/write select, often tied low for write-only use
Enable clock input
Parallel data bit 0, unused in 4-bit mode
Parallel data bit 1, unused in 4-bit mode
Parallel data bit 2, unused in 4-bit mode
Parallel data bit 3, unused in 4-bit mode
Parallel data bit 4
Parallel data bit 5
Parallel data bit 6
Parallel data bit 7
Backlight LED anode
Backlight LED cathode
SPI · I2C · 3.3 V · 3.3 – 5 V · Breakout
Adafruit describes product 398 as a 16x2 RGB backlight LCD using digital pins for LCD control and PWM pins for the backlight; the product…
Module pins: VSS / GND, VDD / VCC, LED+ / A, LED- / K. Schematik maps them to your board in the app.
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