About this item

⚙️ PCF8574 I²C I/O Expander Module

📝 Description

The PCF8574 module is an I²C-based 8-bit I/O expander that adds extra digital input/output pins to microcontrollers like Arduino, ESP32, and Raspberry Pi. It’s widely used for keypad interfaces, LCD control, and general-purpose I/O expansion in embedded systems.

🔧 Features

• 🔌 I²C interface (address selectable via jumpers)
• 📈 8-bit bidirectional I/O ports
• ⚡ Wide voltage range: 2.5V to 6V
• 🔄 Supports multiple modules on the same I²C bus
• 🔧 Compatible with Arduino, ESP8266, ESP32, Raspberry Pi
• 🛡️ Built-in open-drain outputs with weak current source

🛠️ Applications

• ⌨️ Keypad interface (matrix keyboards, button inputs)
• 🖥️ LCD or LED display control
• 🤖 Robotics & automation projects
• 📟 General-purpose I/O expansion
• 🏗️ DIY electronics requiring extra pins

⚠️ Notes

• 📌 I²C address can be set with jumpers (0x20–0x27 range)
• ⚡ Requires pull-up resistors on SDA and SCL lines
• 🔧 Outputs are open-drain (require external pull-ups for HIGH level)

✨ Key Advantages

• 🚀 Expands I/O without needing a bigger microcontroller
• 📏 Compact module with easy wiring
• 🔄 Works with multiple microcontrollers
• 💰 Cost-effective solution for embedded projects

🔗 Useful Links

• 📄 PCF8574 Datasheet
• 🔧 Arduino Library for PCF8574