Analog pins
The Atmega microcontrollers used in the Arduino boards contain a six channel analog-to-digital converter (ADC). The function of this device is to convert an analog input voltage into a digital number proportional to the magnitude of the input voltage in relation to the reference voltage (5V).
Serial Monitor
The Serial Monitor (at the top right of your Arduino IDE) is a tool to display the serial data being sent from the Arduino board to the
computer (see Fig 2.5).
Fig 2.5 Serial monitor
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