#include <Arduino.h> // we only need this if we are in PlatformIO

void setup() {
  // initialize serial communication 
  // over the USB wire back to our computer
  Serial.begin( 9600 );
  while(!Serial) ;

  // define which pins in our sketch 
  // will be used as inputs and which as outputs
  pinMode(A2, INPUT);
}

void loop() {
  // read sensor value from pin
  int reading = analogRead(A2);
  
  // print it our as text over the serial wire so 
  // that we can see it on our monitor
  Serial.print( reading );
}