//part 2 a)

#include <Servo.h>
#define sw 8

Servo myservo;
int angle=0;
int senVal=0;

void setup() {
  // put your setup code here, to run once:
  myservo.attach(3);
  myservo.write(angle);
}

void loop() {
  // put your main code here, to run repeatedly:
  senVal=analogRead(A0);
  senVal=map(senVal,0,1023,0,255);
  if(digitalRead(sw)==true){
    if(senVal<50){
      angle=0;
    }
    //modification start here
    else if(senVal>50&&senVal<151){
      angle=90;
    }
    else{
      angle=180;
    }
    //Modification stop here
    myservo.write(angle);
  }
  delay(2000);
}