Arduino I/O Expander – Halx4
Arduino Stackable Header Kit - R3 - PRT-11417 - SparkFun Electronics
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 8-bit GPIO I2C Pin Expander Module Arduino | Arduino, DIY \ Converters \ I2C
Amazon.com: Serial Wombat 18AB I2C / UART Smart I/O GPIO and Analog Expander for Arduino (2 Pack, Black Label) : Electronics
I/O Expander Shield for pcDuino | LinkSprite Learning Center
How to Increase the Number of Digital Pins in Arduino (Port Extender)
64 I/O Expander Shield for max 1024 I/O - Other Hardware Development - Arduino Forum
Wiringexpanders 54qtkjvmjf | Arduino projects, Arduino projects diy, Arduino
Adding an MCP23017 16 port IO expander to Arduino or Esp8266 or Attiny85 or…….. – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
Low cost Digital and Analog IO Expander Shield | Numato Lab
EZ-Expander
EZ-Expander
i2c - Does an I²C IO Expander needs additional resistors for outputs? - Arduino Stack Exchange
PCF8575 I2C 16-Bit Digital Input Output Expander - Hackster.io
Pcf8575 Io Expander Module I2c To 16io For Arduino - Replacement Parts - AliExpress
Interface MCP23017 (Port Expander) With Arduino Uno - YouTube
Using GPIO Expander MCP23017 With Arduino (Get up to 144 GPIOs) - Makerguides.com
A Simple Method For Expanding Arduino IO Capacity | Hackaday
IO Expander For Arduino Microcontroller Circuit Blue PCB With Male Pin Headers | eBay
Pcf8575 Io Expander Module I2c To 16io Integrated Circuits For Arduino - Instrument Parts & Accessories - AliExpress
How to Use Port Expanders on the Arduino - Circuit Basics
PCF8574 GPIO Extender - With Arduino and NodeMCU : 15 Steps - Instructables
49 MORE PINS PLEASE! PCF8574 Arduino Pin Extender (Easy) - YouTube
Adding an MCP23017 I/O Extender to Arduino or ESP8266 - Instructables
Giant I/O Expander for Arduino Mega and Due Form Factors
