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MCP23017 - i2c 16 input/output port expander : ID 732 : $6.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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arduino - Software implementation of I2C bus via port expander - Stack Overflow
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PCF8574 I2C To 8-Bit Digital Port Expander
How to Connect an MCP23017 I/O Port Expander to an Arduino
SparkFun I2C Expander Breakout - PCF8575 - BOB-08130 - SparkFun Electronics
Interfacing Arduino with I2C LCD - Arduino Projects
Using GPIO Expander MCP23017 With Arduino (Get up to 144 GPIOs) - Makerguides.com
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How to Use Port Expanders on the Arduino - Circuit Basics
Adding an MCP23017 16 port IO expander to Arduino or Esp8266 or Attiny85 or…….. – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
PCF8575 i2c 16 bit digital I/O expander – Renzo Mischianti
Read data from MCP23017 (Port Expander). - YouTube
Interface MCP23017 (Port Expander) With Arduino Uno - YouTube
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Pcf8575 Io Expander Module I2c To 16io For Arduino - Replacement Parts - AliExpress
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