PCF8574 I2C I/O Expander Module
—The PCF8574 is an I2C I/O expander that adds eight digital input/output pins to a board using only the two I2C wires.
Specifications
- 8 quasi-bidirectional I/O pins
- I2C interface, up to 8 modules on one bus (64 pins)
- Interrupt output on pin change
- 2.5-6V supply
- Address set by three jumpers
What you can build with the PCF8574 I2C I/O Expander Module
- Running out of pins on a Pico or ESP32
- Driving relay banks and LED panels
- Reading button and keypad matrices
- Backpack for LCD character displays
Compatibility
Works with Arduino, ESP32, Pico and Raspberry Pi over I2C. Output current per pin is limited — it sinks well but sources poorly, so drive LEDs to ground rather than from the pin.
Shipping
Dispatched from New Zealand with courier delivery nationwide, including rural addresses. Prices are in New Zealand dollars.
Availability: Sold out
The PCF8574 is an I2C I/O expander that adds eight digital input/output pins to a board using only the two I2C wires.
Specifications
- 8 quasi-bidirectional I/O pins
- I2C interface, up to 8 modules on one bus (64 pins)
- Interrupt output on pin change
- 2.5-6V supply
- Address set by three jumpers
What you can build with the PCF8574 I2C I/O Expander Module
- Running out of pins on a Pico or ESP32
- Driving relay banks and LED panels
- Reading button and keypad matrices
- Backpack for LCD character displays
Compatibility
Works with Arduino, ESP32, Pico and Raspberry Pi over I2C. Output current per pin is limited — it sinks well but sources poorly, so drive LEDs to ground rather than from the pin.
Shipping
Dispatched from New Zealand with courier delivery nationwide, including rural addresses. Prices are in New Zealand dollars.