What is Arduino Uno?

Arduino Uno is an open source microcontroller board based on the ATmega328P. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs. a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header and a reset button.

What Is Arduino UNO ? ( PINS OVERVIEW )

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Arduino Uno: Specs, dimensions & pinout

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Arduino Uno - Wikipedia

L293D Motor driver sheild. Arduino UNO R3 SMD: In figure 5, it is a