// 500 to 2400


const int servoPin1 = 19;  
const int servoPin2 = 18;
const int servoPin3 = 21;
int pulse ;        // Default pulse duration (in microseconds)
int prevpulse ;
int prevmillis ;
int currentmillis ;
void setup() {
  Serial.begin(9600);
  pinMode(servoPin1, OUTPUT);
  pinMode(servoPin2, OUTPUT);
  pinMode(servoPin3, OUTPUT);
}

void loop() {
prevmillis = millis();
  pulse = Serial.parseInt();  //it takes 1 second to take  input
  if(pulse == 0){
    pulse = prevpulse;
  }
  do{
  // Generate the PWM signal for the servo
  digitalWrite(servoPin1, HIGH);
  digitalWrite(servoPin2, HIGH);
  digitalWrite(servoPin3, HIGH);
  
  delayMicroseconds(pulse);
  digitalWrite(servoPin1, LOW);
  digitalWrite(servoPin2, LOW);
  digitalWrite(servoPin3, LOW);
  // Serial.println(0);
  delayMicroseconds(20000 - pulse); // 20ms - duration of the pulse (50Hz)
  prevpulse = pulse ;
  currentmillis = millis() - prevmillis ;
  }while(currentmillis < 3000);
}
//2225
//385