Description
1602 16×2 Character LCD with I2C Interface
This HD44780-compatible character LCD displays 16 characters on each of two lines. The listed unit includes an I2C adapter based on a PCF8574 I/O expander, allowing the display to communicate over SDA and SCL along with power and ground. Select the blue- or green-backlight version.
Specifications stated in the listing
- Display format: 16 characters × 2 lines (1602)
- Controller family: HD44780-compatible
- Interface: I2C adapter using PCF8574
- Listed supply voltage: 5 V
- Backlight options: blue or green; white characters as stated in the listing
- Contrast: adjustable onboard potentiometer
- Backlight: jumper-selectable
- Listed I2C address: 0x20; address can depend on the adapter and jumper configuration
- Approximate dimensions stated: 79 × 36 × 20 mm; weight stated: 40 g
Connection and setup
Connect SDA and SCL to the matching I2C pins on your controller, and connect power and ground according to the board labels. I2C pin locations differ between Arduino and other boards. Adjust the contrast potentiometer gradually if the text is not visible. Scan the bus or check the adapter jumpers to confirm the actual I2C address before setting it in your library.
Voltage note: the listing specifies a 5 V module. Check whether the adapter’s SDA/SCL pull-up resistors connect to 5 V before using a 3.3 V-only controller; use a suitable bidirectional level shifter if needed. The HD44780U datasheet describes the LCD controller itself; the adapter board’s wiring and voltage limits should also be checked.
