void setup()
{
pinMode(3, OUTPUT);
pinMode(A0, INPUT);
Serial.begin(9600);
// put your setup code here, to run once:
}
void loop()
{
int x=analogRead(A0);
Serial.print("x:");
Serial.println(x);
int y=map(x,0,1023,0,255);
Serial.print("y:");
Serial.println(y);
analogWrite(3,y);
delay(1000);
// put your main code here, to run repeatedly:
}