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EZ-Expander
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PCF8575 i2c 16 bit digital I/O expander – Renzo Mischianti
Buy SX1509 - GPIO expander 16 I/O for Arduino - Botland - Robotic Shop
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![Nettigo: EZ Expander - add digital output pins to Arduino [nootropic design]](https://nettigo.eu/system/images/183/original.jpg?1446026199 "Nettigo: EZ Expander - add digital output pins to Arduino [nootropic design]")
Nettigo: EZ Expander - add digital output pins to Arduino [nootropic design]
PCF8574 i2c digital I/O expander: Arduino, esp8266 and esp32, basic I/O and interrupt – Part 1 – Renzo Mischianti
EZ-Expander Shield for Arduino | Arduino Blog
I/O Expander Shield for pcDuino | LinkSprite Learning Center
