#define pinecho 2
#define pintrig 15
#define pinLed1 23
#define pinLed2 19
#define pinLed3 18
#define pinLed4  5
float distance =0.0;

void sendSensor()
{
  digitalWrite(pintrig, LOW);
  delayMicroseconds(2);
  digitalWrite(pintrig, HIGH);
  delayMicroseconds(10);
  digitalWrite(pintrig, LOW);
  int duration=pulseIn(pinecho, HIGH);
  distance=duration*0.034/2;

  //*****SERIAL MONITOR, menampilkan data jarak**************
  Serial.print(distance);
  Serial.println("cm");
 
}

void setup() {
  //*****SERIAL MONITOR, setting baud rate*******************
  Serial.begin(115200);

  //*****ULTRASONIK, setting pin yang digunakan**************
  pinMode(pinecho, INPUT);
  pinMode(pintrig, OUTPUT);


}

void loop() {
  //********BLYNK, menjalankan blynk****************************
 sendSensor();
 if (distance == 0){
     digitalWrite(pinLed1, LOW);
     digitalWrite(pinLed2, LOW);
     digitalWrite(pinLed3, LOW);
     digitalWrite(pinLed4, LOW);
     Serial.println("jarak = 0");
 }
 
  if (distance == 400.01){
     digitalWrite(pinLed1, HIGH);
     digitalWrite(pinLed2, HIGH);
     digitalWrite(pinLed3, HIGH);
     digitalWrite(pinLed4, HIGH);
     Serial.println("jarak == 400");
 }

 delay(250);
}