#include <WiFi.h>
#include <WiFiClient.h>
#include <EEPROM.h>
#include <LiquidCrystal.h>
#include <ThingSpeak.h>

#define rs 13
#define en 12
#define d4 33
#define d5 32
#define d6 27 
#define d7 26
#define motor 19
#define slide 18 //Switch for Auto Manual mode
#define trig 16
#define echo 15
#define led  17 //Motor

LiquidCrystal lcd(rs,en,d4,d5,d6,d7);

long duration,inches;
bool state,pump;
int set_val,percentage;
int min_level = 30;
int max_level = 90;
int auto_mode;
int manual;

const char *ssid = "wokwi-GUEST";
const char *password = "";
WiFiClient client;

unsigned long myChannelId =  2646228;
char *MywriteAPIkey = "Z9BQ9KCP4FALIKG4";

int statusCode;

void setup() {
  Serial.begin(115200);
  Serial.print("Connecting to WiFi.........");
  WiFi.begin(ssid,password,6);
  while(WiFi.status() != WL_CONNECTED)
  {
    Serial.print(".");
    delay(200);
  }
  Serial.println("wiFi Connected successfully !");
  //WiFi.mode(WIFI.STA);
  ThingSpeak.begin(client);

  lcd.begin(16,2);
  lcd.print("Water Level");
  lcd.setCursor(0,1);
  lcd.print("PUMP:OFF MANUAL");
  pinMode(motor,INPUT_PULLUP);
  pinMode(slide,INPUT_PULLUP);
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
  pinMode(led,OUTPUT);
  
  set_val = EEPROM.read(0);
  if(set_val > 150)
    set_val = 150;

  
}

void loop() 
{
  // put your main code here, to run repeatedly:
  digitalWrite(trig,LOW);
  delayMicroseconds(2);
  digitalWrite(trig,HIGH);
  delayMicroseconds(2);
  digitalWrite(trig,LOW);
  delayMicroseconds(2);

  duration = pulseIn(echo,HIGH);
  inches = microsecondsToInches(duration);
  percentage = (set_val - inches)*100/set_val; //water value

  lcd.setCursor(12,0);
  if(percentage < 0)
    percentage = 0;

  lcd.print(percentage);
  lcd.print("% ");

  auto_mode = digitalRead(slide);
  
  if((percentage < min_level) and auto_mode)
     pump = 1; //pump is ON

  if(percentage > max_level) 
     pump = 0 ; //Pump is OFF

  digitalWrite(led, !pump);
 
  lcd.setCursor(5,1);
  if(pump == 1)
    lcd.print("ON");
  else if (pump == 0)
    lcd.print("OFF");
    
  lcd.setCursor(9,1);

  if(!auto_mode)
    lcd.print("MANUAL");
  else 
    lcd.print("AUTO");

  manual = digitalRead(motor);

  if(!manual and !state and auto_mode)
  {
    state = 1 ;
    set_val = inches;
    EEPROM.write(0,set_val);
  }  
  if (!manual and !state and !auto_mode)
  {
    state = 1;
    pump = !pump;
  }
  if(manual)
    state = 0;
 
  delay(500);  

  ThingSpeak.setField(5,percentage);
  ThingSpeak.setField(6,auto_mode);
  ThingSpeak.setField(7,pump);

  statusCode = ThingSpeak.writeFields(myChannelId,MywriteAPIkey);

  if (statusCode == 200) //Sucsess
  {
    Serial.println("Data written to Thingspeak channel successfully!");
    Serial.println("Water Level :");
    Serial.println(percentage);
    Serial.print("%,Automated Mode :");
    if (auto_mode)
    Serial.print("ON");
    else
    Serial.print("OFF");
    Serial.print(" ;Pump status :");
    if (pump == 1)
     Serial.print("ON");
    else
     Serial.print("OFF");
  }   
  else Serial.print("Error in writing data in ThingSPeak with HTTP code: " + statusCode);
  delay(5000);
  }

long microsecondsToInches(long microseconds)
{
  return (microseconds / 74 / 2);
}