ultrasonic.ardruino

#include <LiquidCrystal_I2C.h>
#include <NewPing.h>
#include <SPI.h>
#include <Ethernet.h>


const int trigPin = 9;
const int echoPin = 10;
const int max_distance = 1400; //in centimeter
// defines variables
long duration;
int distance;

//lcd
LiquidCrystal_I2C maindisplay(0x27, 20, 4);

NewPing sonar(trigPin, echoPin, max_distance);


void setup() {
  // put your setup code here, to run once:
  initLCD();
 
  Serial.begin(9600); // Starts the serial communication
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  
}

void loop() {
  // put your main code here, to run repeatedly:
 ultrasonic_sensor_listener();

}


void initLCD(){

maindisplay.init();
maindisplay.backlight();
maindisplay.setCursor(1, 0);


maindisplay.setCursor(0, 1);
maindisplay.print("Initializing....");
delay(5000);
maindisplay.clear();
maindisplay.print("Water Level:");
}


void ultrasonic_sensor_listener(){

delay(500);
 maindisplay.setCursor(0, 1);
 maindisplay.print(String( get_current_distance() )+String(" cm below sensor"));

  int waterLevel = get_current_distance();

    if(waterLevel>=120){

       turnOnWarningLED();

    }else{

      turnOnOKLED();
    }
}

void turnOnWarningLED(){

  digitalWrite(13, HIGH);
  digitalWrite(12, LOW);
  maindisplay.setCursor(0,3);
  maindisplay.print("LOW WATER LEVEL");

}

void turnOnOKLED(){

  digitalWrite(12, HIGH);
  digitalWrite(13, LOW);

   maindisplay.setCursor(0,3);
  maindisplay.print("WATER LEVEL OK!");

}


int get_current_distance(){

  return sonar.ping_cm();
}


void send_http_request(){

  String message = "Current Water Level is ";
  //perform http request here:
  Serial.println(String(message)+ get_current_distance());

}