Arduino RC interface for helicopters

/*  Carlo Stramaglia 10 October 2021
 *  Code for driving a servo motor using an analog model remote conrol
 *  
 *  look at my youtube channel https://www.youtube.com/c/CarloStramaglia
 */

#include<Servo.h> 

Servo servo1; 

int angle=15;

int ch1;

int val1;

void setup() {
  
pinMode(6, INPUT); // Receiver channel 1 PIN input connection to Arduino
pinMode(2, OUTPUT); // Arduino output for LED light
pinMode(13, OUTPUT); // Internal Arduino led for debug purpose
digitalWrite(2, LOW);
digitalWrite(13, LOW); 

servo1.attach(8); // Servo PIN connection on the Arduino
servo1.write(15); // Go to home position at 15 degrees

Serial.begin(9600);
}

void loop() {
  
  ch1 = pulseIn(6, HIGH, 25000); //Configuration of the plseIN on PIN 6 

  if (ch1 > 1400 and ch1 < 1500){
    digitalWrite(2, HIGH);
    digitalWrite(13, HIGH);
  }
    
  else if (ch1 > 1900) {
    digitalWrite(2, LOW);
    digitalWrite(13, LOW);
    //servo1.write(0);
     }
  else if (ch1 > 900 and ch1 < 1000) {
    digitalWrite(2, HIGH);
    digitalWrite(13, HIGH);
    for (angle=15 ; angle <= 130; angle +=1) {
      servo1.write(angle);
      delay (40);
    }
    for (angle=130 ; angle >= 40; angle -=1) {
      servo1.write(angle);
      delay (40);
    }
    for (angle=40 ; angle <= 179; angle +=1) {
      servo1.write(angle);
      delay (40);
    }
    for (angle=179 ; angle >= 15; angle -=1) {
      servo1.write(angle);
      delay (40);
    }
  }
  
 }