Description
The device shown in the image is an I2C-enabled 16×2 Character LCD Module.
It consists of a standard 16×2 Liquid Crystal Display (LCD) equipped with an I2C “backpack” module soldered to the back. This backpack uses an I/O expander chip (typically the PCF8574 or PCF8574T) to convert the I2C serial signal into the parallel data required by the LCD.
Product Specifications (Typical)
| Feature | Specification |
| Display Type | Alphanumeric Character LCD |
| Capacity | 16 characters × 2 lines (32 characters total) |
| Interface | I2C (uses only 2 wires: SDA and SCL) |
| Controller | HD44780 (standard for 1602 LCDs) |
| Backlight | Blue (White text) |
| Operating Voltage | 5V DC (typically) |
| I2C Address | Usually 0x27 or 0x3F (configurable via jumpers) |
| Adjustments | On-board potentiometer for contrast control |
Key Benefits
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Simplified Wiring: Instead of using 10–12 pins on your Arduino, this module requires only 4 pins: VCC, GND, SDA, and SCL.
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Easy Contrast Control: The blue potentiometer (trimmer) on the backpack allows you to manually adjust the text clarity.
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Wide Compatibility: It is standard in the hobbyist community and widely supported by the
LiquidCrystal_I2Clibrary for Arduino.
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