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Buy Adafruit GPIO Expander Bonnet – 16x GPIO over I2C at the right price @ Electrokit
NANO I2C IO Expander - Hackster.io
PCF8574 IO Expansion Board 8 bit I/O Expander für I2C bus PCF8574 auf Bord| expander|expander board - AliExpress
PCF8575 IO Expander Modul I2C Zu 16IO Integrierte Schaltungen Für arduino|Instrumententeile & Zubehör| - AliExpress
I2C Port Expander Module for LCD XC3706Control LCDs using just 2 pins via I2C.
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FXCO PCF8575 IO Expander Modul I2C bis 16IO: Amazon.de: Elektronik & Foto
MCP23017 - i2c 16 Input/Output Port Expander : Amazon.de: Spielzeug