ET-D10
I²C Character LCD Backpack
Run a 16×2 or 20×4 LCD from two I²C pins, Qwiic
AED 29.00
Out of stockOverview
Run a 16×2 or 20×4 LCD from two I²C pins, Qwiic
The ET-D10 is built around the NXP PCF8574T — drives an HD44780 LCD in 4-bit mode over I²C. It connects over I²C 0x27 default (0x20–0x27 via jumpers); Qwiic / STEMMA QT and is powered from 5V for standard LCDs (3.3V LCDs: power VIN from 3.3V).
Two Qwiic / STEMMA QT connectors let you chain it with other boards without soldering, and the 2.54 mm header fits a breadboard.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Menus and status screens
- Upgrading old LCD projects to I²C
- Classroom kits
Key features
What makes it different
Expander
NXP PCF8574T: drives an HD44780 LCD in 4-bit mode over I²C
Interface
I²C 0x27 default (0x20–0x27 via jumpers); Qwiic / STEMMA QT
Supply
5V for standard LCDs (3.3V LCDs: power VIN from 3.3V)
Display
Any HD44780 16×2, 20×4, 16×4 with the 16-pin 2.54mm header; contrast trimmer, switched backlight
Qwiic / STEMMA QT
Two JST-SH connectors plus a 2.54 mm header — 3.3 V and 5 V hosts.
Open documentation
Schematic, BOM and layout notes published for every board.
Specifications
Technical specifications
| Expander | NXP PCF8574T: drives an HD44780 LCD in 4-bit mode over I²C |
|---|---|
| Interface | I²C 0x27 default (0x20–0x27 via jumpers); Qwiic / STEMMA QT |
| Supply | 5V for standard LCDs (3.3V LCDs: power VIN from 3.3V) |
| Display | Any HD44780 16×2, 20×4, 16×4 with the 16-pin 2.54mm header; contrast trimmer, switched backlight |
| Size | 50.8 × 19.1 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 2 × Qwiic / STEMMA QT (JST SH 4-pin) · 4-pin 2.54 mm header |
| Main IC | PCF8574T/3,518 (LCSC C7605) |
| Revision | Rev A |
| Libraries | LiquidCrystal_I2C (Arduino), RPLCD / lcd_i2c (Python) |
|---|
| JP1 (default Closed) | Power LED |
|---|---|
| JP2 (default Closed) | I²C pull-ups |
| JP3 (default Closed) | Backlight power (cut = always off) |
| JP4 (default Open) | Bridge A0/A1/A2 to GND → address 0x20–0x26 |
Performance
Compatibility
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Power | 5V (most LCDs need 5V) |
| 2 | GND | Ground | Ground |
| 3 | SCL | I²C | I²C clock |
| 4 | SDA | I²C | I²C data |
Qwiic / STEMMA QT pins: GND, VIN, SDA, SCL (same on both connectors). I²C pull-ups (10 kΩ) are on the board; cut JP2 to remove them.
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-D10 I²C Character LCD Backpack (assembled)
- 1 × 4-pin 2.54 mm male header, unsoldered
- 1 × 1x16 2.54mm male header to the LCD (ship loose)
Getting started
- Plug in a Qwiic / STEMMA QT cable, or solder the header and wire VIN, GND, SDA and SCL
- Libraries: LiquidCrystal_I2C (Arduino), RPLCD / lcd_i2c (Python)
- Run an I²C scanner to confirm the address: 0x27, 0x20, 0x27
Compare
Which text display?
| I²C Character LCD Backpack (this board)This board | ET-D01 HT16K33 4-Digit 7-Segment Display | ET-D03 MAX7219 8-Digit Display | |
|---|---|---|---|
| What it does | Run a 16×2 or 20×4 LCD from two I²C pins, Qwiic | 0.56" red 4-digit display on I²C, Qwiic | Eight 7-segment digits on SPI, daisy-chainable |
| Interface | I²C 0x27 default (0x20–0x27 via jumpers); Qwiic /… | I²C 0x70; Qwiic / STEMMA QT | SPI (DIN, CS, CLK) with DOUT for daisy-chaining… |
| Best for | Menus and status screens | Clocks and timers | Frequency and voltage meters |
| Price | 29 AED | 39 AED | 11 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.