Adafruit PCF8574 I2C GPIO Expander Breakout

Expand your project possibilities with the Adafruit PCF8574 GPIO Expander Breakout, an affordable 8-channel I2C expander. Connect it over I2C to control GPIO pins for reading and writing, without needing more GPIO from your board.

Benefits include:

• Cost-effective with 8 I/O pins
• Three I2C address select jumpers for up to 64 total GPIO
• Open-drain output with 100K resistor pull-up built-in
• Light pull-up inputs and strong 20mA low-driving transistor sink output

Use it to read buttons or switches by connecting them to ground, or control LEDs by linking them to positive voltage through a resistor. Achieve effortless GPIO output logic levels or receive input logic levels by configuring the pins accordingly.

Compatible with Arduino and CircuitPython through dedicated libraries that simplify input/output modes. It fits seamlessly in your setup with the custom-made PCB in STEMMA QT form factor, ensuring easy integration with other sensors and accessories via compatible cables.