#include <LiquidCrystal_I2C.h>
#include <WiFi.h>
#include "ThingSpeak.h"

const char*ssid = "Wokwi-GUEST";
const char*password ="";
const int myChannelNumber = 2696648;
const char* myAPIKey ="4KGNCFNKL77IQRO7";
const char* server = "api.thingspeak.com";
WiFiClient client;

LiquidCrystal_I2C lcd(0x27,16,2);
LiquidCrystal_I2C lcd2(0x27,16,2);

#define ECHO_PIN 2
#define TRIG_PIN 15
#define buzzer 5
#define ledmerah 12
#define ledhijau 14
#define ledkuning 13
#define sensorPin 34

long duration;

void setup() {
  Serial.begin(115200); 
  pinMode(ledmerah, OUTPUT); 
  pinMode(ledhijau, OUTPUT);
  pinMode(ledkuning, OUTPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(sensorPin, INPUT);
  lcd.setCursor(0,1);
  lcd.init();
  lcd.backlight();
  lcd2.setCursor(0,1);
  lcd2.init();
  lcd2.backlight();
  
  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while (WiFi.status() != WL_CONNECTED){
   delay(500);
   Serial.print(".");
  }
  Serial.println("Wifi connected !");
  Serial.println(WiFi.localIP());
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
 }

void loop() {
  lcd.print("Ketinggian Air");
  
  delay(4000);
  lcd2.print("Arus Sungai:");
  lcd.clear();
  lcd2.clear();
  digitalWrite(TRIG_PIN, HIGH); 
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW); 
  duration = pulseIn(ECHO_PIN, HIGH);
  float distance = duration * 0.034 / 2;
  float sensorValue = analogRead(sensorPin);
  float arus = sensorValue * (5.0/4095); // Konversi nilai sensor menjadi tegangan (0 - 5V)
  float waterflow = mapFloat(arus, 0.0, 5.0, 0.0, 200.0); // Konversi tegangan menjadi kecepatan Arus Air (0 - 100 ms)
  


 if(distance >= 300 ) // jika nilai kedalaman lebih dari 300, maka :
 {
    digitalWrite(ledmerah, HIGH); 
    digitalWrite(ledhijau, LOW);
    digitalWrite(ledkuning, LOW);
    lcd.clear();
    lcd.print("Tinggi Air:"); 
    lcd.print(distance); 
    lcd.print(" cm");
    lcd.setCursor(0,1);
    lcd.print(" Status :"); 
    lcd.print(" BAHAYA"); 
    digitalWrite(buzzer, LOW); 
    tone(5,800,1000);
    delay(2000); 
 }
 else if (distance >= 200 && distance <= 299)
   
 { // jika nilai kedalaman lebih dari 200 namun kurang dari 300, maka :
    digitalWrite(ledmerah, LOW);
    digitalWrite(ledhijau, LOW);
    digitalWrite(ledkuning, HIGH); 
    lcd.clear();
    lcd.print("Tinggi Air:"); 
    lcd.print(distance); 
    lcd.print(" cm");
    lcd.setCursor(0,1);
    lcd.print("Status :");
    lcd.setCursor(9,1);
    lcd.print(" Siaga"); 
    delay(1000); 
    lcd.clear();
    delay(100);
  }

  else if (distance <= 199 )
  {
    digitalWrite(ledmerah, LOW);
    digitalWrite(ledhijau, HIGH);
    digitalWrite(ledkuning, LOW); 
    lcd.clear();
    lcd.print(" Water Level:"); 
    lcd.print(distance); 
    lcd.print(" cm");
    lcd.setCursor(0,1);
    lcd.print(" Status :");
    lcd.setCursor(9,1);
    lcd.print("Aman");
    delay(1000); 
    lcd.clear();
    delay(100);; 
    
  }

  if (waterflow >= 50 && waterflow <= 75 )
  {
    digitalWrite(ledmerah, LOW);
    digitalWrite(ledhijau, LOW);
    digitalWrite(ledkuning, HIGH); 
    lcd2.clear();
    lcd2.print(" Arus:"); 
    lcd2.print(waterflow); 
    lcd2.print(" m/s");
    lcd2.setCursor(0,1);
    lcd2.print(" Arus :");
    lcd2.setCursor(9,1);
    lcd2.print("siaga");
    delay(1000); 
    lcd.clear();
    delay(100); 
    
  }
  else if (waterflow >= 76 )
  {
    digitalWrite(ledmerah, HIGH);
    digitalWrite(ledhijau, LOW);
    digitalWrite(ledkuning, LOW); 
    lcd2.clear();
    lcd2.print(" Arus:"); 
    lcd2.print(waterflow); 
    lcd2.print(" m/s");
    lcd2.setCursor(0,1);
    lcd2.print(" Arus Air :");
    lcd2.setCursor(9,1);
    lcd2.print("Bahaya");
    digitalWrite(buzzer, LOW); 
    tone(5,800,1000);
    delay(2000); 
  }
  else if (waterflow <= 49 )
  {
    digitalWrite(ledmerah, LOW);
    digitalWrite(ledhijau, HIGH);
    digitalWrite(ledkuning, LOW); 
    lcd2.clear();
    lcd2.print(" Arus:"); 
    lcd2.print(waterflow); 
    lcd2.print(" m/s");
    lcd2.setCursor(0,1);
    lcd2.print(" Arus Air :");
    lcd2.setCursor(9,1);
    lcd2.print("Tenang");
    delay(1000); 
    lcd.clear();
    delay(100);
    
  }
   delay(10);
   ThingSpeak.setField(1,distance);
   ThingSpeak.setField(2,waterflow);
   ThingSpeak.setField(3,ledmerah);
   ThingSpeak.setField(4,ledkuning);
   ThingSpeak.setField(5,ledhijau);
   ThingSpeak.setField(6,buzzer);
   int x = ThingSpeak.writeFields(myChannelNumber,myAPIKey);
}
float mapFloat(float x, float in_min, float in_max, float out_min, float out_max) {
  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
}