Hypersonic distance measure

hardware

• Arduino board
• LCD 1602A board
• HC SR04 chip

wiring

• A4 SDA (LCD)
• A5 SCL (LCD)
• 2 Trig (HC)
• 3 Echo (HC)

code

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <NewPing.h>

LiquidCrystal_I2C lcd(0x27,16,2);
#define TRIGGER_PIN 2 // Arduino pin tied to trigger pin on the ultrasonic sensor.
#define ECHO_PIN    3 // Arduino pin tied to echo pin on the ultrasonic sensor.
#define MAX_DISTANCE  400 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400 - 500 cm.
NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE); // NewPing setup of pins and maximum distance.

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200); // Open serail monitor at 115200 baud to see ping result;
  lcd.init();
  lcd.backlight();
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(100); // Wait 50ms between pings (about 20 pings/sec). 29ms shoudl be the shortest delay between pings.
  unsigned int uS = sonar.ping(); // Send pin, get ping time in microseconds (uS)
  Serial.print("Ping: ");
  Serial.print(uS / US_ROUNDTRIP_CM); // Convert ping time to distance in cm and print result (0 = ourside set distance range)
  Serial.println("cm");
  lcd.setCursor(0,0);
  lcd.print("Distance:");
  lcd.setCursor(0,1);
  lcd.print("        ");
  lcd.setCursor(9, 1);
  lcd.print(uS / US_ROUNDTRIP_CM);
  lcd.setCursor(12, 1);
  lcd.print("cm");
}