long readUltrasonicDistance(int triggerPin, int echoPin)
{
    pinMode(triggerPin, OUTPUT);  // Clear the trigger
    digitalWrite(triggerPin, LOW);
    delayMicroseconds(2);
    // Sets the trigger pin to HIGH state for 10 microseconds
    digitalWrite(triggerPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(triggerPin, LOW);
    pinMode(echoPin, INPUT);
    // Reads the echo pin, and returns the sound wave travel time in microseconds
    return pulseIn(echoPin, HIGH);
}

void setup()
{
    Serial.begin(9600);
  
    pinMode(12, OUTPUT);
    pinMode(8, OUTPUT);
    pinMode(5, OUTPUT);
}

void loop()
{
    Serial.println(0.01723 * readUltrasonicDistance(4, 3));
  if (0.01723 * readUltrasonicDistance(4, 3) < 70) {
        digitalWrite(12, HIGH);
        digitalWrite(8, LOW);
        digitalWrite(5, LOW);
  } else {
    if (0.01723 * readUltrasonicDistance(4, 3) < 150) {
            digitalWrite(12, LOW);
            digitalWrite(8, HIGH);
            digitalWrite(5, LOW);
    } else {
            digitalWrite(12, LOW);
            digitalWrite(8, LOW);
            digitalWrite(5, HIGH);
    }
  }
    delay(10); // Delay a little bit to improve simulation performance
}

----------------------------------------------------------

const int UltrasonikTrig1 = 11;
const int UltrasonikEcho1 = 12;
const int Indikator = 10;

void setup() {
    Serial.begin(9600);
    pinMode(UltrasonikTrig1, OUTPUT);  
    pinMode(UltrasonikEcho1, INPUT);
    pinMode(Indikator, OUTPUT); 
}
long duration1; 
long cm1;
 
void loop()
{
    digitalWrite(UltrasonikTrig1, LOW);
    digitalWrite(UltrasonikTrig1, HIGH);
    delayMicroseconds(10);
    
    digitalWrite(UltrasonikTrig1, LOW);
    duration1 = pulseIn(UltrasonikEcho1, HIGH);
    cm1 = microsecondsKeCenti(duration1);
    Serial.print("Sensor 1 : ");
    Serial.print(cm1);
    Serial.print(" cm");
    Serial.print(" || ");
   // if the distance less than 100 cm / 1 meter
    if (cm1 <= 100) 
    {
          digitalWrite(Indikator, HIGH);
    }
    else
    {
          digitalWrite(Indikator, LOW);
          Serial.print(" Save");
    }
    Serial.println(" || "); 
    delay(100);
}
long microsecondsKeCenti(long microseconds)
{
    return microseconds / 29 / 2;
}

-------------------------------------

#include <LiquidCrystal.h>

const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
int inches = 0;

float cm = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)
{
    pinMode(triggerPin, OUTPUT);  // Clear the trigger
    digitalWrite(triggerPin, LOW);
    delayMicroseconds(2);
    // Sets the trigger pin to HIGH state for 10 microseconds
    digitalWrite(triggerPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(triggerPin, LOW);
    pinMode(echoPin, INPUT);
    return pulseIn(echoPin, HIGH);
}

void setup()
{
  lcd.begin(16, 2);
}
void loop()
{
    // measure the ping time in cm
    cm = 0.01723 * readUltrasonicDistance(7, 7);
    // set up the LCD's number of columns and rows:
    
    // Print a message to the LCD.
    lcd.print("Distance:");
    lcd.setCursor(0, 1);
    lcd.print(cm);
    delay(1000); // Wait for 100 millisecond(s)
    lcd.clear();
    
    
}