Description I2C to GPIO IO expander breakout board, you can use it for applications like remote IO expander, digital potentiometer, segment display driver etc Based on low cost chip CH423. You can replace with similar chips like PCF23017, PCF8574, etc 8 Bidirectional IO ports IO0-IO7 16 Output-only IO ports: OC0 – OC15 3-5V power supply, compatible I2C interface Documentation please see on this page.
