A0221AU ultrasound distance sensor

Other Hardware Sensors
7 
// LCD I²C library
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2); // creation of lcd instance with address, #characters, #lines

#include <SoftwareSerial.h>
int distance = 0;
int pinRX = 10;
int pinTX = 11;
unsigned char data_buffer[4] = {0};
unsigned char CS;

// Object to represent software serial port
SoftwareSerial mySerial(pinRX, pinTX);

void setup() {
  // put your setup code here, to run once:
  Serial.begin (9600);

  // Set up SoftwareSerial port
  mySerial.begin(9600);
}

void loop() {
  
  // Check if data available on mySerial port
  if (mySerial.available() > 0) {
    delay (4);
    
    if (mySerial.read() == 0xff) { // detect 0xff (= delimiter) before reading the 4 data bytes
      data_buffer[0] = 0xff;
      for (int i = 1; i < 4; i++) {  // Read 4 data bytes
        data_buffer[i] = mySerial.read();
      }

      // compute CheckSum
      CS = data_buffer[0] + data_buffer[1] + data_buffer[2];
      if (data_buffer[3] == CS) {
        distance = (data_buffer[1] << 8) + data_buffer[2];
      }
    }
  }

  if (distance >= 4000 || distance <= 30) {
    Serial.println("OutOfRange");
    }
  else {
    // Serial.print (Dip1); Serial.print (Dip2); 
    Serial.print (distance);
    Serial.println ("  mm");
  }
  delay(2000);
}