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Project | ATtiny 1-series with Arduino support | Hackaday.io
ATtiny2313 Input Pins
Technoblogy - Getting Extra Pins on ATtiny
Tiny AVR Programmer Hookup Guide - SparkFun Learn
microcontroller - Use the RESET PIN on Attiny85 as Input with voltage divider - Electrical Engineering Stack Exchange
Pull-up Resistors explained - ATMega32 AVR
Attiny (tinyAVR) series-0 and how to use their GPIO - Daumemo
