/**********************************
*Project        : CEIS490 IoT data collection
*Institution    : DeVry University
*Module         : 3
*Program Purpose: Sends data to ThingSpeak
*Date created   : 2024.06.11
**********************************/


#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>
#include <ThingSpeak.h>
#include <WiFi.h>

#define DHTTYPE DHT22 //Using DHT22 sensor

const char* ssid = "Wokwi-GUEST";   // your network SSID (name) 
const char* password = "";   // your network password

WiFiClient  client;

String studentName = "XXXXX"; // Replace xxxxx with your name
String programEnrolled = "XXXXX"; //Replace xxxxx with your program Use your major for example: Engineering Technology
unsigned long myChannelNumber = 2568494;  //Put the correct channel number
const char * myWriteAPIKey = "2FAASIFFLK5MMJOK"; // Use correct Write API Key


unsigned long lastTime = 0;
unsigned long timerDelay = 10000;

const int DHT_PIN = 15;

DHT dht(DHT_PIN, DHTTYPE);

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET     4
#define SCREEN_ADDRESS 0x3C
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

int sensorPin = A0;

void setup() {
  WiFi.mode(WIFI_STA);   
  ThingSpeak.begin(client);  // Initialize ThingSpeak

  // Connect or reconnect to WiFi
    if(WiFi.status() != WL_CONNECTED){
      Serial.print("Attempting to connect");
      while(WiFi.status() != WL_CONNECTED){
        WiFi.begin(ssid, password); 
        delay(5000);     
      } 
      Serial.println("\nConnected.");
    }

  
  Serial.begin(115200);
  
    // Checked the OLED display
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setTextColor(WHITE);
  display.setTextSize(2);
  Serial.println("CEIS490 Module 3 Project ");
  Serial.println(String(__DATE__) + "\t" + String(__TIME__));
  Serial.println("Name: " + studentName);
  Serial.println("DeVry Program: " + programEnrolled); //Replace xxxxx with your program Use your major for example: Engineering Technolog
  Serial.println("Setup done");

}

unsigned long t=0;
unsigned long interval = 20000; //the update interval should be at least 30s
bool tempScale = false ; // selects temperature scale. false = Celcius true = Fahrenheit 

void loop() {
  
  float temp = dht.readTemperature(tempScale); //the tempScale selects the reading temperature scale
  float hum = dht.readHumidity();
  
 
  //Serial.println(analogRead(sensorPin));
  Serial.println("Temp: " + String(temp, 2) + "°C");
  Serial.println("Humidity: " + String(hum, 1) + "%");
  
  Serial.println("---");
  delay(3000); // Wait for a new reading from the sensor (DHT22 has ~0.5Hz sample rate)

  display.clearDisplay();
  display.setTextSize(1.8);
  display.setTextColor(SSD1306_WHITE);
  
  display.setCursor(0, 0);
  display.println(studentName);
  display.setCursor(0, 15);
  display.println("Temp: " +String(temp, 2) + " C");
 
  display.setCursor(0, 30);
  display.println("Humidity: " +String(hum, 1) + " %");
  
  display.display();
  if ( (millis()-t) > interval){ //Writing to ThingSpeak if the log time has elapsed.
    ThingSpeak.setField(1, temp);
    ThingSpeak.setField(2, hum);

    int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
    
    
    if(x == 200){
      Serial.println("Channel update successful.");
    }
    else{
      Serial.println("Problem updating channel. HTTP error code " + String(x));
    }
    t = millis();

  }

}