int time = 50;
float v1;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600); 
}

void loop() {
  // put your main code here, to run repeatedly:
  int b = analogRead(0);
  v1 = 5.*b/1023.;
  int c = b/4;
  analogWrite(3,c);
  Serial.print(b);
  Serial.print("  ");
  Serial.print(c);
  Serial.print("  ");
  Serial.println(v1,4);
  delay(time);
}