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

#define PIN_TRIG 26
#define PIN_ECHO 25
#define LOWLED   18
#define MIDLED   19
#define HIGHLED  21

const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber = 2675402;
const char* myApiKey = "C7UTQGLXD7CZT727";
const char* server = "api.thingspeak.com";

float level = 0;
float percentage = 0;

WiFiClient client;

void setup() {
    Serial.begin(115200);

    pinMode(LOWLED, OUTPUT);
    pinMode(MIDLED, OUTPUT);
    pinMode(HIGHLED, OUTPUT);
    pinMode(PIN_TRIG, OUTPUT);
    pinMode(PIN_ECHO, INPUT);

    digitalWrite(LOWLED, HIGH);
    digitalWrite(MIDLED, HIGH);
    digitalWrite(HIGHLED, HIGH);
    
    WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
    while (WiFi.status() != WL_CONNECTED) {
        delay(1000);
        Serial.println("WiFi not connected...");
    }
    Serial.println("WiFi connected!");
    Serial.println("Local IP: " + String(WiFi.localIP()));

    ThingSpeak.begin(client);  
}

void loop() {
    
    digitalWrite(PIN_TRIG, HIGH);
    delayMicroseconds(10);
    digitalWrite(PIN_TRIG, LOW);

    int duration = pulseIn(PIN_ECHO, HIGH);
    level = 405.62- (duration / 58.0);  
    percentage = (level / 400.0) * 100;  

    Serial.print("level of tank: ");
    Serial.println(level);
    Serial.print("Percentage of tank filled: ");
    Serial.println(percentage);

    if (level < 100) {
        digitalWrite(LOWLED, LOW);
        digitalWrite(MIDLED, HIGH);
        digitalWrite(HIGHLED, HIGH);
    } else if (level >= 100 && level < 385) {
        digitalWrite(LOWLED, HIGH);
        digitalWrite(MIDLED, LOW);
        digitalWrite(HIGHLED, HIGH);
    } else if (level >= 385) {
        digitalWrite(LOWLED, HIGH);
        digitalWrite(MIDLED, HIGH);
        digitalWrite(HIGHLED, LOW);
    }

    ThingSpeak.setField(1, percentage); 
    int responseCode = ThingSpeak.writeFields(myChannelNumber, myApiKey);
    
    
    if (responseCode == 200) {
        Serial.println("Data pushed successfully");
    } else {
        Serial.println("Push error: " + String(responseCode));
    }
    
    Serial.println("---");

    delay(1000); 
}