// 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
  int dutyCycle = map(pulse, 0, 1023, 650, 2400);
  analougWrite(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)
  int prevpulse = pulse ;
  
}
//2225
//385