int cm = 0;
#include <LiquidCrystal.h>
// initialize the library with the numbers of the
// interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
 // set up the LCD's number of columns and rows:
 lcd.begin(16, 2);
 // set the cursor to column 0, line 0
 lcd.setCursor(0, 0);
 // Print a message to the LCD.
 lcd.print("Praktik 08");
 // set the cursor to column 0, line 1
 lcd.setCursor(0, 1);
 // Print a message to the LCD
 lcd.print("Pengukur Jarak");
 delay (1000);
 // Clear LCD Display
 lcd.clear();
}
void loop() {
// measure the ping time in cm
 cm = 0.01723 * readUltrasonicDistance(7, 7);
 lcd.setCursor(0,0);
 lcd.print("Jarak: ");
 lcd.setCursor(6,0);
 lcd.print(cm);
 lcd.setCursor(9,0);
 lcd.print("cm");
 delay(100); // Wait for 100 millisecond(s)
}
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);
}