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Arduino RESET
You can reset your Arduino board, for example, start the program from the very beginning. Firstly, use
the RESET button（17）. Or you can connect an external reset button to Arduino pin 5 labeled RESET.
Pin Header（3.3V，5V，GND，Vin）
3.3V - provides 3.3V output voltage
5V - provides 5V output voltage
Using 3.3 volts and 5 volts, most components can normally operate with Arduino board together.
GND（Ground pins）- two GND headers on Arduino, each of which can be used for circuit ground.
Vin - You can supply an external power (like AC power supply) through this pin to Arduino board.
Analog Pins
Arduino UNO board has 6 analog inputs, labeled A0 through A5. These pins can read the signal from
analog sensors (such as humidity sensor or temperature sensor), and convert it into the digital value
that can read by microcontrollers)
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