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PCF8574 I2C 8-bit Port Expander Breakout Board — PMD Way
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PCF8574 I2C Port Expander Test & Demo (V2) - YouTube
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PCF8574 & I/O Quick Start
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PCF8574 GPIO Extender - With Arduino and NodeMCU : 15 Steps - Instructables
PCF8574 i2c digital I/O expander: Arduino, esp8266 and esp32, rotary encoder – Part 2 – Renzo Mischianti
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MCP23008 - i2c 8 input/output port expander : ID 593 : $1.95 : Adafruit Industries, Unique & fun DIY electronics and kits
