#include <Servo.h> 

Servo servo1;

void setup() 
{
 pinMode(A0, INPUT);
 pinMode(9, OUTPUT);
 Serial.begin(9600);
 servo1.attach(6);
}
int a;
void loop() 

{
  a= analogRead(A0);
  Serial.println(a);

  analogWrite(9, a/4);
  servo1.write(a/(1024/180));
  delay(20);
}