int LEDpin=9;
int sensorPin=0;
int sensorVal=0;
int LEDval=0;
void setup() {
  // put your setup code here, to run once:
pinMode (LEDpin,OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
sensorVal= analogRead(sensorPin);
Serial.println(sensorVal);
LEDval=map(sensorVal,0,1023,0,255);
Serial.println(LEDval);
LEDval= constrain(LEDval,0,255);
analogWrite(LEDpin,LEDval);

}