#include <ESP32Servo.h>

Servo myservo;  // create servo object to control a servo

int pos = 0;    // variable to store the servo position
const int stepSize = 10;  // define the step size
const int maxPos = 180;   // maximum servo angle
const int minPos = 0;     // minimum servo angle

void setup() {
  myservo.attach(D7);  // attaches the servo on pin 9 to the servo object
  myservo.write(pos); // set initial position
  Serial.begin(9600);
}

void loop() {
  if (Serial.available() > 0) {  // check if data is available to read
    char command = Serial.read(); // read the incoming byte
    
    if (command == '1') {  // if the command is '1'
      pos += stepSize;     // increase position by stepSize
      if (pos > maxPos) {  // if the position exceeds maxPos
        pos = maxPos;      // set it to maxPos
      }
      myservo.write(pos);  // move the servo to the new position
      Serial.println(pos); // print the new position
   
    } else if (command == '0') {  // if the command is '0'
      pos -= stepSize;     // decrease position by stepSize
      if (pos < minPos) {  // if the position falls below minPos
        pos = minPos;      // set it to minPos
      }
      myservo.write(pos);  // move the servo to the new position
      Serial.println(pos); // print the new position
    
    }
  }
}