void setup() 
{
  // put your setup code here, to run once:
pinMode(3, OUTPUT);
pinMode(A0, INPUT);
Serial.begin(9600);
}

void loop()
{
  // put your main code here, to run repeatedly:
int x=analogRead(A0);
Serial.println(x);


int y=map(x,0,1023,0,255);
//serial.print1n
analogWrite(3,y);
delay(100);
}