In Stock
Price: KSH 150.00
I2C Module for LCD Displays
Pinout, Features, Working, and Applications
Features of the I2C Module
- Reduces pin usage for LCD displays from 16 to only 4 (GND, VCC, SDA, SCL).
- Built-in PCF8574 I/O expander IC for I2C communication.
- Supports LCD displays such as 1602 (16x2) and 2004 (20x4).
- Onboard potentiometer for contrast adjustment.
- Backlight control pin for energy saving.
- Compatible with most microcontrollers, including Arduino and ESP32.
I2C Module Pinout
| Pin | Description |
|---|---|
| GND | Ground connection. |
| VCC | Power supply (typically 5V). |
| SDA | Serial Data Line for I2C communication. |
| SCL | Serial Clock Line for I2C communication. |
| A0, A1, A2 | Address selection pins to configure I2C address. |
How the I2C Module Works
The I2C module uses the PCF8574 I/O expander IC to interface an LCD with a microcontroller using only two I2C lines: SDA (data) and SCL (clock). The microcontroller communicates with the module using a 7-bit address (default: 0x27 or 0x3F). Data sent by the microcontroller is processed by the PCF8574, which controls the LCD by toggling its data and control pins.
Applications of I2C Modules
- Used in projects requiring compact pin usage, such as Arduino or ESP-based systems.
- Temperature and humidity monitoring with real-time data display.
- Home automation for displaying system status.
- Industrial control panels for machine monitoring.
- DIY embedded systems with LCD interfaces.
