The PCF8574 I2C Expansion Board Adapter Module is a versatile I/O expander that allows you to increase the number of input/output pins available to your microcontroller using the I2C communication protocol. Built around the PCF8574 chip, this module provides 8 additional digital I/O pins, making it ideal for projects where the number of GPIO pins on your Arduino, ESP32, ESP8266, or Raspberry Pi is limited.
This module is especially useful in applications like LCD displays, keypad interfaces, sensor arrays, and robotics where multiple I/O connections are required. With its simple two-wire I2C interface, it reduces the number of control lines while still enabling full control of additional devices. Multiple PCF8574 modules can be connected on the same I2C bus by adjusting the address pins, allowing for scalable expansion.
Key features include:
- IC Used: PCF8574 I2C I/O Expander
- I/O Pins: 8 bidirectional digital input/output pins
- Interface: Standard I2C protocol (2-wire)
- Addressing: Configurable addresses allow multiple modules on one bus
- Operating Voltage: 2.5V to 6V (compatible with 3.3V and 5V systems)
- Compact Design: Easy to integrate with microcontroller projects
- Applications: LCD and keypad interfaces, sensor/relay control, robotics, and automation systems
Applications:
- Expanding GPIO pins on Arduino, ESP32, and Raspberry Pi
- Controlling relays, sensors, or actuators
- Driving LCDs or keypad input systems
- Robotics, automation, and embedded projects
- Educational electronics and prototyping
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