Expander – Hamtech Electronics Technologies https://hamtechtechnologies.com Wed, 26 Nov 2025 20:07:39 +0000 en-US hourly 1 https://wordpress.org/?v=7.0.2 https://hamtechtechnologies.com/wp-content/uploads/2025/11/h-100x100.webp Expander – Hamtech Electronics Technologies https://hamtechtechnologies.com 32 32 PCF8574 Expander https://hamtechtechnologies.com/product/pcf8574-expander/ https://hamtechtechnologies.com/product/pcf8574-expander/#respond Thu, 20 Nov 2025 19:52:04 +0000 https://hamtechtechnologies.com/index.php/product/pcf8574-expander/ PCF8574 I2C Expander is an 8-bit I/O expander for I2C bus systems, allowing you to increase the number of digital I/O pins for microcontrollers like Arduino, ESP32, or Raspberry Pi.]]> The PCF8574 I2C Expander is a versatile module that communicates via the I2C protocol, providing 8 additional digital input/output pins using only two microcontroller pins (SDA and SCL). It is perfect for projects that need extra GPIO pins without complex wiring. The module supports up to 8 devices on the same I2C bus with configurable addresses. Ideal for driving LEDs, reading buttons, controlling relays, and other digital I/O operations.

Key Features

  • Adds 8 digital I/O pins via I2C interface

  • Only uses 2 microcontroller pins (SDA, SCL)

  • Address selectable via 3 address pins (A0, A1, A2)

  • Compatible with Arduino, ESP32, ESP8266, and Raspberry Pi

  • Low power consumption, suitable for battery-operated projects

Variants

  • PCF8574 Standard I2C Expander Module

  • PCF8574A Variant (alternate address range)

Specifications

Feature Details
I/O Pins 8 (P0–P7)
Interface I2C (SDA, SCL)
Address Pins 3 (A0, A1, A2)
Operating Voltage 3.3V – 5V
Max Current per Pin 25 mA
Communication Speed Up to 400 kHz

Applications

  • Expand GPIO for Arduino, ESP32, Raspberry Pi

  • Drive multiple LEDs or relays

  • Read multiple buttons or switches

  • Control digital devices in IoT projects

  • Microcontroller-based automation systems

Compatible Boards / Circuits

  • Arduino Uno, Mega, Nano

  • ESP32 / ESP8266

  • Raspberry Pi (via I2C)

  • Any microcontroller with I2C support

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