int LED = 9;
int brightness;

void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(LED,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
int reading = analogRead(A0);
float voltagEq = reading * (5.0/1023.0);
brightness = map(reading, 0,1023, 0,255);
Serial.println("Voltage Reading: " + String(voltagEq));
Serial.println("Brightness value: " + String(brightness));
analogWrite(LED,brightness);
delay(500);
}