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PCF8575 16 bit SMBus I/O ports IIC I2C I/O Extension Shield Module For Arduino | eBay
Increasing Digital I/O Pins of Arduino uno Using 8255 Peripheral Programmable Interface with Arduino
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Amazon.com: DWEII 6pcs Nano I/O Expansion Sensor Shield Compatible with Arduino UNO R1 Nano 3.0 Duemilanove 2009 : Electronics
10pcs Pcf8575 Module Expansion Io Port Expander Board Dc 2.5-5.5v I2c Communication Control 16 Io Ports For Arduino - Integrated Circuits - AliExpress
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8-Bit IO Port Library for Arduino - Hackster.io
Arduino UNO Pin Connections. There are total 19 I/O pins. All pins can... | Download Scientific Diagram
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Increasing Digital I/O Pins of Arduino uno Using 8255 Peripheral Programmable Interface with Arduino
