float resprint;
void setup()
{
  
  pinMode(9, OUTPUT);
  pinMode(A0, INPUT);
  Serial.begin(9600);
}

void loop()
{
  //analog read 1023
  //analog write 2 fifty three
  resprint = (5./1023.)*(analogRead(A0));
  Serial.println(resprint);
  analogWrite(9,analogRead(A0));
}