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Using GPIO Expander MCP23017 With Arduino (Get up to 144 GPIOs) - Makerguides.com
How to Use Port Expanders on the Arduino - Circuit Basics
Low cost Digital and Analog IO Expander Shield | Numato Lab
Pcf8575 Io Expander Module I2c To 16io For Arduino - Replacement Parts - AliExpress
Atlas Scientific COM-102 Serial Port Expander (4 Port)
GitHub - thebradleysanders/ESPHome-Arduino-Port-Expander: An Arduino Port Expander for ESPHome with added Arduino Mega 2560 support
Amazon.com: ACEIRMC 3pcs PCF8575 IO Expander Board Module I2C to 16IO IIC I2C I/O Extension Shield Module 16 bit SMBus I/O Ports for Arduino R3 (3pcs) : Electronics
PCF8574 I2C to 8-bit digital port expander
Using ESP01 adapter with Arduino Port Expander. Only RX/TX exposed. Can I change the pin definitions and use this? Trying to add esp home to my pool controller : r/Esphome