![]() It has a power jack, an ICSP header, reset button, and LEDs. The board has a USB port that is used to program the board and also for giving power. It has a 16 MHz quartz crystal oscillator which provides a clock signal to microcontroller Atmega 328. ![]() PWM mainly used in Arduino for controlling Servo Motors, LEDs, Speed Controlling, etc. PWM (Pulse Width Modulation) is a technique to get analog results from digital means. D3, D5, D6, D9, D10, and D11 are the PWM pins in Arduino UNO. From that 14 digital pins, 6 pins can be used as PWM outputs. The board has 14 digital pins that can be used as input/output. The board provides sets of digital and analog I / O pins (input/output), which can be interfaced in various extension boards (shields) and other circuits. It is a widely used board than other Arduino Boards. Arduino UNO is based on the Atmega328P microcontroller which is developed by which is an open-source microcontroller board.
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