float input_voltage = 0.0;
float open_input_voltage = 0.0;


void setup()
{
   Serial.begin(9600);     //  opens serial port, sets data rate to 9600 bps
}

void loop()
{   
   int analog_value = analogRead(A0);
   int free_value = analogRead(A1);
   input_voltage = (analog_value * 5.0) / 1023.0; 
   open_input_voltage = (free_value * 5.0) / 1023.0; 

    Serial.print("pot volt= ");
    Serial.println(input_voltage);
    Serial.print("open pin volt= ");
    Serial.println(open_input_voltage);
    delay(1000);
}