Just like the original Nintendo, the Arduino has a reset button (10). It is sometimes used to set an external reference voltage (between 0 and 5 Volts) as the upper limit for the analog input pins. Most of the time you can leave this pin alone. AREF (9): Stands for Analog Reference.We have a tutorial on PWM, but for now, think of these pins as being able to simulate analog output (like fading an LED in and out). ![]() These pins act as normal digital pins, but can also be used for something called Pulse-Width Modulation (PWM).
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