#define led_hijau 13
#define led_kuning 12
#define led_merah 11
// #define tombol 7
// int status = 0;
#define ECHO_PIN 5
#define TRIG_PIN 4

void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
pinMode(led_hijau, OUTPUT);
pinMode(led_kuning, OUTPUT);
pinMode(led_merah, OUTPUT);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
// pinMode(tombol, INPUT);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  int duration = pulseIn(ECHO_PIN, HIGH);
  return duration * 0.034 / 2;
}

void loop() {
  // put your main code here, to run repeatedly:
// if(digitalRead(tombol) == HIGH){
//   status++;
//   delay(100);
// }

float distance = readDistanceCM();

  Serial.print("Measured distance: ");
  Serial.println(distance);

// if(status == 1){
  if(distance <= 50){
  digitalWrite(led_hijau, HIGH);
  digitalWrite(led_kuning, LOW);
  digitalWrite(led_merah, LOW);
}
// else if(status == 2){
  else if(distance <= 100){
  digitalWrite(led_hijau, LOW);
  digitalWrite(led_kuning, HIGH);
  digitalWrite(led_merah, LOW);
}
// else if(status == 3){
  else{
  digitalWrite(led_hijau, LOW);
  digitalWrite(led_kuning, LOW);
  digitalWrite(led_merah, HIGH);
}
// else{
//   digitalWrite(led_hijau, LOW);
//   digitalWrite(led_kuning, LOW);
//   digitalWrite(led_merah, LOW);
//   status = 0;
// }
  delay(100);

}