#define ECHO_PIN 2
#define TRIG_PIN 3
#define led1 4 
#define led2 5
int durasi;
float jarak;

void setup() {
Serial.begin(115200);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
}

void loop() {
digitalWrite(TRIG_PIN, LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
durasi = pulseIn(ECHO_PIN, HIGH);
jarak = durasi * 0.034 / 2;
Serial.print("jarak");
Serial.println(jarak);
delay (200);

if (jarak <50)
{
  digitalWrite(led1, HIGH);
  digitalWrite(led2, LOW);
}
else
{
  digitalWrite(led1, LOW);
  digitalWrite(led2, HIGH);
}
}