
Arduino UNO is hardware which is based on the ATmeg328P micro-controller. It has 14 digital input/output pins (of which 6 can be used as PWM inputs/outputs), 6 analog inputs, a 16 MHz quartz crystal, a USB connection, a power jack, an ICSP header and a reset button.
The Arduino UNO can be purchased from many vendors; however, I always recommend purchasing directly from Arduino.
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