int readVoltage;
int greenPin=5;
int delayTime=10;
int readVal = A3;
float LEDvoltage;
int LEDvalue;
///////////////////
void setup() {
  // put your setup code here, to run once:
digitalRead(greenPin);
Serial.begin(9600);
}
//////////////////
void loop() {
  // put your main code here, to run repeatedly:
LEDvalue=(255.0/1023.0)*analogRead(readVal);
delay(delayTime);
analogWrite(greenPin, LEDvalue);
}