int digitalPin = 9;  
int digitalValue = 0; 

void setup() {
  
  Serial.begin(9600);
}

void loop() {
  
  digitalValue = digitalRead(digitalPin);

  
  Serial.print("Digital Value: ");
  Serial.println(digitalValue);

 /*float voltage = analogValue * (5.0 / 1023.0);
Serial.print("Voltage: ");
Serial.println(voltage);*/

  delay(500);  
}