/*
  Arduino | coding-help
  Raid - Tuesday, February 3, 2026 10:36 PM

  It's not sending the Bluetooth to my phone
  But if u test it out normally it worked
  But then when I integrated codes together
  It just refuse to send the temperature only shows the OLED temp

  TO DO: fix button

*/

#include <Wire.h>
#include <HardwareSerial.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <DHT.h>

#define SCREEN_WIDTH 128  // OLED display width, in pixels
#define SCREEN_HEIGHT 64  // OLED display height, in pixels
#define OLED_RESET -1     // reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C
#define DHTTYPE DHT22

const int DHT_PIN = 13;
const int TXD_PIN = 25;
const int RXD_PIN = 26;
const int BTN_PIN = 25;
const int LED_PIN = 33;
const unsigned long TWO_SEC = 2000; // DHT can only be read every 2 seconds

int oldBtnState = HIGH;
unsigned long prevTime = 0;
float h = 0.0;
float t = 0.0;
float f = 0.0;

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
DHT dht(DHT_PIN, DHTTYPE);
//dht DHT;
HardwareSerial BT(1);

bool checkButton()  {
  bool wasPressed = false;

  int btnState = digitalRead(BTN_PIN);  // read the pin
  if (btnState != oldBtnState)  {       // if it changed
    oldBtnState = btnState;             // remember the state
    if (btnState == LOW)  {             // was just pressed
      Serial.println("Button Pressed");
      wasPressed = true;
    } else  {                           // was just released
      Serial.println("Button Released");
    }
    delay(20);  // short delay to debounce button
  }
  return wasPressed;
}

void setup() {
  Serial.begin(9600);
  dht.begin();
  BT.begin(9600, SERIAL_8N1, RXD_PIN, TXD_PIN);
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }
  display.setTextSize(2); // Draw 2X-scale text
  display.setTextColor(SSD1306_WHITE);
  pinMode(LED_PIN, OUTPUT);
  pinMode(BTN_PIN, INPUT_PULLUP);
  // splash screen
  Serial.println("\nTemperature over BT test\n");
}

void loop() {
  // read the state of the pushbutton
  int buttonState = checkButton();
  display.clearDisplay();
  display.setCursor(10, 0);
  if (buttonState) {
    // turn LED on:
    digitalWrite(LED_PIN, HIGH);
    display.println("LED ON");
    display.print("Temp:");
    display.println(t);
    display.display();
    // send temp via BT
    BT.print("Temperature: ");
    BT.println(t);
    Serial.println("Sent temp over BT");
  } else  {
    // turn LED off:
    digitalWrite(LED_PIN, LOW);
    display.println(F("LED OFF"));
    display.display();
  }

  // read DHT every 2 seconds
  if (millis() - prevTime >= TWO_SEC) {
    prevTime = millis();
    h = dht.readHumidity();     // read humidity
    t = dht.readTemperature();  // read Celsius temp
    f = dht.readTemperature(true);  // read Fahrenheit temp
    // Check if any reads failed and exit early (to try again).
    if (isnan(h) || isnan(t) || isnan(f)) {
      Serial.println("Failed to read from DHT sensor!");
      return;
    }
    Serial.print("Temp: ");
    Serial.print(t, 1);
    Serial.print("°C\t");
    Serial.print("Humdity: ");
    Serial.print(h, 0);
    Serial.println("%");
  }
  /*
    display.clearDisplay();
    display.setCursor(10, 0);
    // button uses INPUT_PULLUP, state goes LOW when pressed
    if (buttonState == LOW) {
    // turn LED on:
    digitalWrite(LED_PIN, HIGH);
    display.println("LED ON");
    display.print("Temp:");
    display.println(t);
    display.display();
    // send temp via BT
    BT.print("Temperature: ");
    BT.println(t);
    Serial.println("Sent temp over BT");
    } else  {
    // turn LED off:
    digitalWrite(LED_PIN, LOW);
    display.println(F("LED OFF"));
    display.display();
    }
  */
}