LCD 16×2 with I2C Soldered Display

The LCD 16×2 with I2C Soldered Display combines a standard 16×2 character LCD with a pre-soldered PCF8574 I2C backpack. It requires only 2 data pins (SDA/SCL) for communication, freeing up valuable GPIO pins on your microcontroller.

Key Features

• 16×2 character display with pre-soldered I2C backpack
• I2C interface uses only 2 pins (SDA + SCL)
• PCF8574 I2C expander built-in
• Adjustable I2C address (usually 0x27 or 0x3F)
• Backlight control via I2C
• Contrast adjustment potentiometer on backpack

Technical Specifications

Applications

• I2C-based projects with limited pins
• Multi-sensor systems needing many GPIO
• Clean wiring setups
• Arduino projects with many components
• Raspberry Pi displays
• Educational courses teaching I2C

Important Notes

• Install LiquidCrystal_I2C library – check I2C address
• Common addresses: 0x27, 0x3F – scan with I2C scanner if unsure
• Backlight can be controlled on/off via library function
• Adjust contrast pot on backpack if display is blank
• I2C speed: 100kHz standard, can try 400kHz for faster updates