/* A program that displays the correct voltage reading from the potentiometer as you 
dial it on the serial monitor.*/

/* Notes: 
The integrated models from the Uno, 
Mega and other normal Arduinos have a 10-bit resolution. 
This means that a voltage between 0 and 5 V on 5V Arduinos will 
be represented by a corresponding value between 0 and 1023. A 
voltage of 2.5 V will be equal to 512, which is half of the range.
The analogRead() function only provides integers from 0 to 1023. 
The range 0 to 1023 is mapped to 0 to 5V. That comes built into 
the Arduino. We can then calculate the voltage as follows:
V = 5 * (analogRead() value / 1023)
*/

// Declare global variables
int analogValue = 0;
int previousAnalogValue = 0;
float voltValue;

void setup() {
  // put your setup code here, to run once:
  
  // initialize serial communication
  Serial.begin(9600);

  pinMode(A0, INPUT);
}

void loop() {
  // put your main code here, to run repeatedly:

  // Read the analog value on the potentiometer
  analogValue = analogRead(A0);

  // Only convert the value if it is different to the previously read value
  if (analogValue != previousAnalogValue) {
    // convert the analog value (between 0-1023) to voltage (0-5.0V)
    voltValue = 5 * (analogValue / 1023.);

    // print the results
    Serial.print("The voltage reading is: ");
    Serial.print(voltValue);
    Serial.println("V.");
    Serial.println("");
    delay(100);

    // record the current value as the previous value
    previousAnalogValue = analogValue;
  }


  
}