Port Expander Library
8-bit I/O Expander with I2C-Bus/SPI Interface - EEWeb
Port Expanders Extend MCU Functionality | DigiKey
Port Expander Library
Mcp23s17 Bidirectional 16-bit I/o Expander Spi Serial Interface Shield Module I2c Interface 10 Mhz Max High Speed Board - Integrated Circuits - AliExpress
Expand 8 Click | Mikroe
Port Expander ece4760
MAX7313 16-Port I/O Expander with LED Intensity Control, Interrupt, and Hot-Insertion Protection | Analog Devices
$2.69 - 8 Port Expander: SPI MCP23S08 - Tinkersphere
MCP23017 Serial Interface Module IIC I2C SPI MCP23S17 Bidirectional 16 Bit I/O Expander Pins 10Mhz Serial Interface Module|module i2c|c c - AliExpress
PIC32MX and Microchip MCP23S17 I/O Expander SPI Communications
Mcp23017 Serial Interface Module Iic I2c Spi Mcp23s17 Bidirectional 16-bit I/o Expander Pins 10mhz Serial Interface Module - Replacement Parts - AliExpress
PIM517 IO Expander Breakout Board - Pimoroni | Mouser
/i/52501/products/2014-05-17T12%3A37%3A57.763Z-MiniPiio%20DIO16%20Kit.jpg?1606306133 "Raspberry PIIO - DIO16 16ch SPI Port Expander Kit from DTRONIXS on Tindie")
Raspberry PIIO - DIO16 16ch SPI Port Expander Kit from DTRONIXS on Tindie
7I50 SPI I/O expander
![chip-hold]MCP23017 IIC to 16CH GPIO Expander Board - ElectroDragon](https://s5.electrodragon.com/wp-content/uploads/2019/10/MCP23017-IIC-to-16CH-GPIO-Expander-01.jpg "chip-hold]MCP23017 IIC to 16CH GPIO Expander Board - ElectroDragon")
chip-hold]MCP23017 IIC to 16CH GPIO Expander Board - ElectroDragon
MCP23017 serial Interface module IIC I2C 16-bit I/O expander pins 10MH – eElectronicParts
MCP23S17 16-Bit I/O Expander SPI - ProtoSupplies
/i/52501/products/2014-05-17T12%3A41%3A31.337Z-MiniPiio_DIO16.jpg?1606306133 "Raspberry PIIO - DIO16 - 16ch SPI Port Expander from DTRONIXS on Tindie")
Raspberry PIIO - DIO16 - 16ch SPI Port Expander from DTRONIXS on Tindie
Port Expander Library
MCP23008 - i2c 8 input/output port expander : ID 593 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
I²C and SPI GPIO Expanders - Exar Corporation | DigiKey
IO-Port Expanders Offer Flexibility in MCU Designs | DigiKey
Using Multiple IO Expander MCP23S08 Address Issue - Networking, Protocols, and Devices - Arduino Forum
![Microchip MCP23S17 SPI Port Expander 5 volts [SPL-002006] - $1.89 : SpikenzieLabs, Great electronics kits](https://www.spikenzielabs.com/Catalog/images/medium/LabsImages/SPL002006A_MED.jpg "Microchip MCP23S17 SPI Port Expander 5 volts [SPL-002006] - $1.89 : SpikenzieLabs, Great electronics kits")