#define echoPin 12 // Echo Pin
#define trigPin 11 // Trigger Pin
#define LEDPin 13 // Onboard LED
char rec;

int maximumRange = 350; // максимальна відствнь
int minimumRange = 50; // Minimum range needed
float duration, distance; // Duration used to calculate distance

void setup() {
 Serial.begin (9600);
 pinMode(trigPin, OUTPUT);
 pinMode(echoPin, INPUT);
 pinMode(LEDPin, OUTPUT); // Use LED indicator (if required)
}

void loop() {
/* The following trigPin/echoPin cycle is used to determine the distance of the nearest object by bouncing soundwaves off of it. */ 
 digitalWrite(trigPin, LOW); 
 delayMicroseconds(2); 

 digitalWrite(trigPin, HIGH);
 delayMicroseconds(10); 
 
 digitalWrite(trigPin, LOW);
 duration = pulseIn(echoPin, HIGH);
 
 //Calculate the distance (in cm) based on the speed of sound.
 distance = duration/58.2;
 
 if (distance >= maximumRange || distance <= minimumRange){
 /* Send a negative number to computer and Turn LED ON to indicate "out of range" */
 Serial.println("Віддаль лежить за допустимим діапазоном");
 Serial.print("\n\r");
 digitalWrite(LEDPin, HIGH); 
 delay(50);
 }
 else {
 /* Send the distance to the computer using Serial protocol, and
 turn LED OFF to indicate successful reading. */
 Serial.println(distance);
 Serial.print("\n\r");
 digitalWrite(LEDPin, LOW); 
 delay(250);
 }
 
 //Delay 50ms before next reading.
 delay(5000);
byte l[255];
  byte count=0;
  int i;
  if (Serial.available()>0){
  while(Serial.available()>0){
    digitalWrite(LEDPin, HIGH); 
   l[count] = Serial.read();
   count++;}
  for(i=0;i<count;i++){
    Serial.write(l[i]);};
    Serial.println();
    Serial.print("\n\r");
    delay(5000);}
}