#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "RTClib.h"
#include <WiFi.h>
#include "ThingSpeak.h"

const char* WIFI_NAME = "Wokwi-GUEST"; // WiFi SSID
const char* WIFI_PASSWORD = ""; // WiFI Password
const int myChannelNumber = 2543105; // ThingSpeak channel number
const char* myApiKey = "UZDJCWHRUSBBLOJ5"; // ThingSpeak API key
const char* server = "api.thingspeak.com"; // ThingSpeak server address

RTC_DS1307 rtc;

#define tempSensor 33

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels


// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
#define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
WiFiClient client; 


const float BETA = 3950;
float Temperature = 0.0;
String Date;
String Time;

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

  if (!rtc.begin()) {
    Serial.println("Couldn't find RTC");
    Serial.flush();
    abort();
  }

  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }
  display.display();
  delay(2000); // Pause for 2 seconds
  // Clear the buffer
  display.clearDisplay();
  
   WiFi.begin(WIFI_NAME, WIFI_PASSWORD); // Connect to the WiFi network
  while (WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("Wifi not connected"); // Print a message if WiFi is not connected
  }
  Serial.println("Wifi connected !"); // Print a message if WiFi is connected
  Serial.println("Local IP: " + String(WiFi.localIP())); // Print the local IP address
  WiFi.mode(WIFI_STA); // Set the WiFi mode to station mode
  ThingSpeak.begin(client); // Initialize the ThingSpeak library
}

void loop() {
  Temperature = temperature();
  dateTime();
  displayTT();
  ThingSpeak.setField(1,Temperature);
  // Set the value of field 2 in the ThingSpeak channel to the humidity 
  //ThingSpeak.setField(2,data.humidity); 

  // Write the data to the ThingSpeak channel
  int status = ThingSpeak.writeFields(myChannelNumber,myApiKey);
  delay(1000);
  display.clearDisplay();
}

float temperature() {
  int analogValue = analogRead(tempSensor);
  float celsius = 1 / (log(1 / (4096. / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" ℃");
  return celsius;
}

void displayTT() {
  display.setCursor(0, 0);
  display.drawRect(0, 0, 128, 64, SSD1306_WHITE);
  display.setTextColor(SSD1306_WHITE);
  display.setTextSize(1);
  display.setCursor(5, 15);
  display.print("Date: ");
  display.println(Date);
  display.setCursor(5, 25);
  display.print("Time: ");
  display.println(Time);
  display.setCursor(5, 35);
  display.print("Temperature: ");
  display.print(Temperature);
  display.println(" C");
  display.display();
}

void dateTime() {
  DateTime now = rtc.now();

  String y = String(now.year());
  String m = String(now.month());
  String d = String(now.day());
  String h = String(now.hour());
  String mi = String(now.minute());
  String s = String(now.second());
  Date = y + "/" + m + "/" + d;
  Time = h + ":" + mi + ":" + s;
}