#define trg 5
#define echo 4
int led=2;
void setup() 
{
  Serial.begin(9600);
  pinMode(trg, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(led, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(7, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);

}

void loop() 
{
  long duration,distance;
  digitalWrite(trg, LOW);
  delayMicroseconds(2);
  digitalWrite(trg, HIGH);
  delayMicroseconds(10);
  digitalWrite(trg, LOW);
  duration=pulseIn(echo,HIGH);
  distance=duration*0.034/2;
  Serial.print("masofa: ");
  Serial.print(distance);
  Serial.println(" sm ");
  delay(100);
  if(distance>300){
    digitalWrite(led, HIGH);}
  if(distance<300){
    digitalWrite(led, LOW);}
  if(distance>200){
    digitalWrite(6, HIGH);}
  if(distance<200){
    digitalWrite(6, LOW);}
  if(distance>150){
    digitalWrite(7, HIGH);}
  if(distance<150){
    digitalWrite(7, LOW);}
  if(distance>100){
    digitalWrite(8, HIGH);}
  if(distance<100){
    digitalWrite(8, LOW);}
  if(distance>50){
    digitalWrite(9, HIGH);}
  if(distance<50){
    digitalWrite(9, LOW);}
    
    

}