Read Analog Voltage

/*  ReadAnalogVoltage  Reads an analog input on pin 0, converts it to voltage, and prints the result to the serial monitor.  Graphical representation is available using serial plotter (Tools > Serial Plotter menu)  Attach the center pin of a potentiometer to pin A0, and the outside pins to +5V and ground.
  This example code is in the public domain.*/
// the setup routine runs once when you press reset:void setup() {  // initialize serial communication at 9600 bits per second:  Serial.begin(9600);}
// the loop routine runs over and over again forever:void loop() {  // read the input on analog pin 0:  int sensorValue = analogRead(A0);  // Convert the analog reading (which goes from 0 - 1023) to a voltage (0 - 5V):  float voltage = sensorValue * (5.0 / 1023.0);  // print out the value you read:  Serial.println(voltage);}