![]() It is sometimes used to set an external reference voltage (between 0 and 5 Volts). AREF: AREF stands for Analog Reference.GND (Ground) : There are many GND pins on the Arduino, any of which can be used to ground your circuit.Pulse Width Modulation (PWM) Pin: The Arduino UNO board has 14 digital I/O pins out of which 6 can be used for PWM.RX Pin: Serial RX (receive) is found at the digital pin 1, indicating the pin is responsible for serial communication. ![]() It is found at the digital pin 0, indicating the pin is responsible for serial communication.
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