int led1 = 13;
int led2 = 12; 
int led3 = 2;

int pin_TRIG = 11;
int pin_ECHO = 10;


void setup() {
pinMode (led1, OUTPUT);
pinMode (led2, OUTPUT);
pinMode (led3, OUTPUT);

Serial.begin(9600);
pinMode (pin_TRIG, OUTPUT);
pinMode (pin_ECHO, INPUT);


}

void loop() {
digitalWrite (pin_TRIG, HIGH);
delayMicroseconds(10);
digitalWrite (pin_TRIG,LOW);

double selang = pulseIn (pin_ECHO, HIGH);
double jarak = 0.0343 * (selang/2);

if (jarak >400 || jarak <=5)

Serial.println ("Jarak Anda tidak terdeteksi sensor");

digitalWrite(led1,HIGH);
digitalWrite(led2,LOW);
digitalWrite(led3,LOW);

}