#include <LCD_I2C.h>
#include  "WiFi.h" 
WiFiClient client;
const float BETA = 3950; // should match the Beta Coefficient of the thermistor
#define heater 15
LCD_I2C lcd(0x27, 16, 2);

String thingSpeakAddress = "api.thingspeak.com";
String writeAPIKey;
String tsfield1Name;
String request_string;

void setup() {
  lcd.begin();
  lcd.backlight();
  Serial.begin(9600);
  pinMode(heater, OUTPUT);
  digitalWrite(heater, LOW);
  WiFi.disconnect();
  WiFi.begin("Wokwi-GUEST", "");
  while ((!(WiFi.status() == WL_CONNECTED))) {
    delay(300);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  int sensor_suhu = analogRead(34);
  float suhu_kolam = 1 / (log(1 / (4095. / sensor_suhu - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature: ");
  Serial.print(suhu_kolam);
  Serial.println(" ℃");
  lcd.setCursor(0, 0);
  lcd.print("Suhu kolam :");
  lcd.setCursor(0, 1);
  lcd.print(suhu_kolam);
  if (suhu_kolam > 34){
    digitalWrite(heater, LOW);
  }else if(suhu_kolam < 26){
    digitalWrite(heater, HIGH);
  }

  // kirim_thingspeak(suhu_kolam);
  delay(1000);
}

void kirim_thingspeak(float suhu_kolam) {
  if (client.connect("api.thingspeak.com", 80)) {
    request_string = "/update?";
    request_string += "key=";
    request_string += "7QP0W9YVRNEMOO59";
    request_string += "&";
    request_string += "field1";
    request_string += "=";
    request_string += suhu_kolam;

    Serial.println(String("GET ") + request_string + " HTTP/1.1\r\n" +
                 "Host: " + thingSpeakAddress + "\r\n" +
                 "Connection: close\r\n\r\n");
                 
    client.print(String("GET ") + request_string + " HTTP/1.1\r\n" +
                 "Host: " + thingSpeakAddress + "\r\n" +
                 "Connection: close\r\n\r\n");
    unsigned long timeout = millis();
    while (client.available() == 0) {
      if (millis() - timeout > 5000) {
        Serial.println(">>> Client Timeout !");
        client.stop();
        return;
      }
    }

    while (client.available()) {
      String line = client.readStringUntil('\r');
      Serial.print(line);
    }

    Serial.println();
    Serial.println("closing connection");

  }
}