#include <Servo.h>

Servo myservo ;
int btn1 = 4;
int btn2 = 2;
int pos = 0;
int val1, val2 ;  


void setup() {
  Serial.begin(9600);
  myservo.attach(11);
  pinMode(btn1, INPUT_PULLUP); // active logic 0
  pinMode(btn2, INPUT_PULLUP); // active logic 0

  myservo.write(pos);  // เริ่มต้นที่ 0 องศา
}

void loop() {
  button_case();

}

void button_case(){
  val1 = digitalRead(btn1);
  val2 = digitalRead(btn2);

  switch(val1){
    if(pos <= 180){
      case 0:
          for(pos = 0; pos <= 180; pos++){
            myservo.write(pos);
            Serial.print("pos = ");
            Serial.println(pos);
            delay(15);
          }
          break;
    }
  }

    switch(val2){
      if(pos >= 0){
          case 0:
          for(pos = 180; pos >= 0; pos--){
            myservo.write(pos);
            Serial.print("pos = ");
            Serial.println(pos);
            delay(15);
          }
          break;
      }
  }

}