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PCF8574 i2c digital I/O expander: Arduino, esp8266 and esp32, rotary encoder – Part 2 - Renzo Mischianti
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Adafruit PCF8574 I2C GPIO Expander Breakout [STEMMA QT / Qwiic] : ID 5545 : $4.95 : Adafruit Industries, Unique & fun DIY electronics and kits
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