PCF8574 i2c digital I/O expander: Arduino, esp8266 and esp32, basic I/O and interrupt – Part 1 – Renzo Mischianti
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Interface MCP23017 (Port Expander) With Arduino Uno - YouTube
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arduino - Software implementation of I2C bus via port expander - Stack Overflow
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Arduino and PCF8574 IO Expander – Binary Counter and I2C Bus Read / Write - Instructables
How to Use Port Expanders on the Arduino - Circuit Basics
PCF8575 I2C IO Extension Shield Module 16 I/O Port Expander Arduino PI | eBay
Arduino Interface PCA9555 GPIO Expander With Code
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SparkFun 16 Output I/O Expander Breakout - SX1509 - BOB-13601 - SparkFun Electronics
