MCP23017: Have you run out of I/O? This chip is the answer!
Arduino Uno to ATmega328 - Shrinking your Arduino Projects - YouTube
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Amazon.com: BenchTech UNO R3 Board ATmega328P for Arduino UNO R3 ATmega328P Development Kits with 9V 1A Power Adapter Gift Kit for Arduino : Electronics
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GitHub - MCUdude/MightyCore: Arduino hardware package for ATmega1284, ATmega644, ATmega324, ATmega324PB, ATmega164, ATmega32, ATmega16 and ATmega8535
