About this item

🔌 PCF8574 I2C to GPIO Expansion Module (OT8980)

The PCF8574 (OT8980) is an I2C-based GPIO expansion module that adds 8 additional digital input/output pins to a microcontroller using only the I2C bus.
It is widely used to save GPIO pins on Arduino, ESP8266, ESP32, Raspberry Pi, and other embedded systems.

🛡️ Features & Advantages

• ➕ 8 bidirectional digital I/O pins
• 🔗 I2C interface (SDA, SCL)
• 🧩 Configurable I2C addresses (A0, A1, A2)
• ⚡ Low power consumption
• 🔧 3.3 V and 5 V compatible

📦 Technical Description

• 🧩 IC: PCF8574 (OT8980)
• 🔌 Interface: I2C
• ➕ GPIO count: 8
• 📍 Address pins: A0, A1, A2
• ⚡ Supply voltage: 3.3 V to 5 V
• 🔄 I/O mode: quasi-bidirectional
• 📏 Form factor: compact PCB module

🛠️ Applications

• 🤖 GPIO expansion for Arduino and ESP boards
• 🧪 Reading buttons, switches, and digital sensors
• 💡 Driving LEDs, relays, and LCD displays (I2C mode)
• 🏠 Home automation projects
• 📚 Educational electronics projects

⚠️ Usage Notes

• ❗ Requires I2C pull-up resistors (often included on the module)
• 🔧 Check the I2C address before use
• 🛡️ Do not exceed per-pin current limits
• 📖 Use a compatible software library (Wire, PCF8574, etc.)

✨ Key Features

• 🔗 GPIO expansion via I2C bus
• ➕ 8 digital I/O pins
• ⚡ 3.3 V / 5 V supply
• 🧩 Configurable addressing
• 📦 Simple and cost-effective module