#include <Servo.h>
Servo servo;
int pb =8;
int pb_state=HIGH;
bool move=false;
int angle =0;
int direction=1;
void setup() {
  // put your setup code here, to run once:
   pinMode(pb, INPUT_PULLUP);
   servo.attach(11);
}

void loop() {
  // put your main code here, to run repeatedly:
   pb_state= digitalRead(8);
   if(pb_state==LOW){
     move=!move;
      while (digitalRead(pb) == LOW) 
       {
   
        }
   }
   if(move){
        if(angle>180){
            angle=180;
            direction=-1;
          }
        if(angle<0){
          angle=0;
          direction =1;
        }
        angle +=direction;
        servo.write(angle);
   }
 delay(5);
}