I/O Expansion Modules in Australia

Shop I/O expansion modules from AuscomTech. We stock practical input and output expansion boards for Arduino, ESP32, ESP8266, Raspberry Pi compatible boards, STM32 and general electronics projects, including digital I/O expanders, port expander modules and GPIO expansion boards depending on current availability.

Whether you are running out of pins on a microcontroller, adding more digital inputs, controlling extra outputs, expanding a sensor project or building a larger control system, I/O expansion modules help increase the number of available connections in your electronics project.

Shop I/O Expansion Modules by Type

Our I/O expansion module range may include products such as:

  • Digital I/O Expander Modules: Modules used to add extra digital inputs and outputs to microcontroller projects.
  • GPIO Expansion Boards: Boards that provide additional general-purpose input/output connections for compatible controller boards.
  • I2C I/O Expanders: I/O expansion modules that connect using I2C to reduce wiring and save microcontroller pins.
  • Port Expander Modules: Modules such as PCF8574, MCP23017-style and similar boards used to expand available I/O.
  • Input / Output Interface Boards: Boards used to simplify connection between microcontrollers, sensors, switches, LEDs and other modules.

I/O Expanders for Arduino, ESP32 & Electronics Projects

I/O expansion modules are commonly used when a project needs more pins than the controller board provides. They are useful for button panels, keypad projects, LED outputs, relay control, sensor inputs, display projects, automation prototypes and control interfaces.

Many I/O expanders use I2C or SPI communication, allowing multiple inputs and outputs to be controlled using only a few microcontroller pins. Always check the voltage, logic level, interface type, number of channels, input/output capability, current rating, address selection and library support before ordering.

PCF8574, MCP23017 & GPIO Expansion Boards

PCF8574-style modules are commonly used for simple I2C digital I/O expansion, while MCP23017-style modules can provide more I/O channels and flexible configuration depending on the board. These modules can be useful when adding switches, LEDs, relay inputs, keypad rows and columns, or other low-current digital signals.

For relay output modules, browse our relay modules category. For ADC and DAC modules used with analog signals, browse our ADC and DAC modules category.

Why Buy I/O Expansion Modules from AuscomTech?

  • Australian stock: Products are shipped from Australia using Australia Post.
  • Practical product range: We stock useful I/O expansion and interface modules for electronics projects, repairs and prototyping.
  • Secure online checkout: Order online using supported secure payment options.
  • Helpful support: Need help choosing an I/O expander? Contact AuscomTech and we’ll help where we can.

Browse I/O Expansion Modules Online

Explore our range of I/O expansion modules in Australia, including digital I/O expanders, GPIO expansion boards, I2C port expanders, PCF8574-style modules, MCP23017-style modules and input/output interface boards depending on current availability. You can also browse related categories such as microcontrollers and development boards, logic level converters and wiring, connectors and prototyping.

Frequently Asked Questions

What is an I/O expansion module used for?

An I/O expansion module is used to add more input and output pins to a microcontroller project when the main board does not have enough available GPIO pins.

Can I use I/O expanders with Arduino or ESP32?

Yes. Many I/O expansion modules are suitable for Arduino compatible boards, ESP32, ESP8266, Raspberry Pi compatible boards and other microcontroller projects, provided the voltage and interface are compatible.

What is a PCF8574 module used for?

A PCF8574-style module is commonly used to add extra digital I/O over I2C. It is often used for buttons, LEDs, simple inputs, outputs and LCD interface projects.

What is the difference between I/O expansion and an ADC module?

I/O expansion modules usually add digital inputs and outputs. ADC modules are used to measure analog voltages and convert them into digital values for a microcontroller.

Can you help me choose the right I/O expansion module?

Yes. If you are unsure which module suits your project, contact AuscomTech with your controller board, number of inputs and outputs needed, voltage, interface type and connected devices.

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