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Amazon.com: diymore 5pcs Pro Mini ATmega328P 3.3V 8M Module Board with Crystal Oscillator Pins Replace ATmega128 : Electronics
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Variable Frequency PWM(Pulse Width Modulation) signal generation using Timers of Arduino(Atmega328p Microcontroller)/Arduino Fast PWM
GitHub - MCUdude/MiniCore: Arduino hardware package for ATmega8, ATmega48, ATmega88, ATmega168, ATmega328 and ATmega328PB
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