PCF8574 IIC module for LCD

The PCF8574 I2C module for LCD serves as a valuable tool in simplifying the interaction between a microcontroller and a standard LCD (Liquid Crystal Display). Particularly advantageous when employed with microcontrollers such as Arduino, Raspberry Pi, or other platforms supporting I2C communication, this module hinges on the PCF8574, an 8-bit I/O expander equipped with an I2C interface. Its salient feature lies in its ability to empower the microcontroller to manage the LCD with minimal digital pins.

The module boasts dedicated pins for interfacing with the microcontroller's I2C bus, encompassing the SDA (data) and SCL (clock) lines. These facilitate seamless bidirectional communication between the microcontroller and the PCF8574. The module provides pins for interfacing with the LCD module: data lines (D4-D7), RS (Register Select), EN (Enable), and RW (Read/Write).

Enhancing its utility, the module incorporates a potentiometer for contrast adjustment on the LCD. This fine-tuning feature ensures optimal visibility of characters on the display. Notably, the PCF8574's three address pins (A0, A1, A2) play a pivotal role in setting the I2C address. This configurability is essential for preventing conflicts when multiple I2C devices share the same bus.

Designed for versatility, the module accommodates various LCD sizes and configurations, with a common application being 16x2 or 20x4 character LCDs. The pinout and control signals align seamlessly with the specifications of these displays.

Moreover, the module includes a jumper for backlight control, allowing users to toggle the backlight on or off based on their requirements. This added functionality enhances the adaptability of the PCF8574 I2C module for LCD across diverse applications.

Kit Content

• 1x PCF8574 IIC module for LCD

Applications

• Embedded Systems and Prototyping
• IoT (Internet of Things) Devices
• Temperature and Humidity Monitoring
• Data Logging Systems
• Home Automation
• DIY Electronics

I2C Adress Selection

Connection diagram

Datasheet

PCF8574 DATASHEET