Amazon.com: Comimark 3Pcs PCF8574 PCF8574T I2C 8 Bit IO GPIO Expander Module for Arduino & Raspberry Pi : Electronics
I2C connection with PCF8574 (Remote 8-Bit I/O Expander) to drive LED - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums