#include <Servo.h>
Servo servo3;
Servo servo6;
Servo servo9;
#define echo 11
#define trig 12
volatile long A;

void setup() {
  // put your setup code here, to run once:
  servo3.attach(3);
  servo6.attach(6);
  servo9.attach(9);
  pinMode(echo, INPUT);
  pinMode(trig, OUTPUT);
  Serial.begin(9600);
}
float snsr(){
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  int durasi = pulseIn(echo, HIGH);
  return durasi / 58;
}

void loop() {
  int jarak = snsr();
  Serial.print("Sensor : ");
  Serial.print(jarak);
  Serial.println("  CM");
  if(jarak <= 100){
  A = random(1, 4);
  if(A == 1){
    Serial.println("Random A = Batu");
    servo3.write(0);
    while(jarak <= 100){
      jarak = snsr();
    }
    servo3.write(90);
  }else if(A == 2){
    Serial.println("Random A = Gunting");
    servo6.write(0);
    while(jarak <= 100){      
      jarak = snsr();
    }
    servo6.write(90);
  }else if(A == 3){
    Serial.println("Random A = Kertas");
    servo9.write(0);
    while(jarak <= 100){
      jarak = snsr();
    }
    servo9.write(90);
  }
  }
}