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Increasing Digital I/O Pins of Arduino uno Using 8255 Peripheral Programmable Interface with Arduino
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Extra I/O Pins for Your Arduino Uno : 4 Steps - Instructables
Arduino - Wikipedia
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Arduino Mega 2560, 54 Digital Input/Output Pins at Rs 630/piece in Bengaluru
Android Basics and User Interfaces
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Increasing Digital I/O Pins of Arduino uno Using 8255 Peripheral Programmable Interface with Arduino
