void setup()
 {
  Serial.begin(9600);
  pinMode(A0,INPUT);
  pinMode(10,OUTPUT);
  }

void loop()
 {
   int a=analogRead(A0); //10 bit adc
   int pwn=a/4; //8 bit dac
   Serial.println(pwn);
   Serial.println(a);
   analogWrite(10,pwn);
   delay(50);

}