#define relayOut 2 
int relayIn = 6 ; 
int led = 3 ; 
int trig = 4 ; 
int echo = 5 ; 
int time = 0 ;
int distance = 0 ; 
int water = 0 ; 
void setup() {
pinMode(relayOut , OUTPUT) ; 
pinMode(led , OUTPUT);
pinMode(trig, OUTPUT);
pinMode(relayIn , OUTPUT);
pinMode(echo , INPUT) ; 
Serial.begin(9600);
}
void loop() {
digitalWrite(trig , HIGH);
delayMicroseconds(5); // us 
digitalWrite(trig , LOW);
delayMicroseconds(2);
time = pulseIn(echo , HIGH) / 2  ; 

distance = time * 0.034 ; 
water = 400 - distance ; 

if(water > 100 && water < 300){
  digitalWrite(relayIn , HIGH);
  digitalWrite(relayOut , HIGH);
  Serial.println("loumour mrigla");
}
if(water > 300){
  digitalWrite(relayIn , LOW);
  digitalWrite(relayOut , HIGH);
  Serial.println("rahou t3aba barcha");

}
if(water < 100){
  digitalWrite(relayIn , HIGH);
  digitalWrite(relayOut , LOW);
  Serial.println("rahou fragh");

}

delay(50) ; // ms 

}