/*tombol akan normal respon bila ditekan lama sd on / off sesuai delay void loop
  bila di klik cepat tdk akan respon, supaya respon cepat karena tdk ada state nya
  harus menggunakan lib AceButton */  

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

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

#define DHT22Pin 26

DHT dht(DHT22Pin, DHT22);
bool button1, statusbut = 0;
float temp;
float hum;
int ldr;

// create an OLED display object connected to I2C
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() { 
  pinMode(25, INPUT); //LDR
  pinMode(DHT22Pin, INPUT); //DHT22
  pinMode(27, INPUT_PULLUP); //Button
  Serial.begin(9600);

  // initialize OLED display with I2C address 0x3C
  if (!oled.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("failed to start SSD1306 OLED"));
    while (1);
  }

  delay(2000);         // wait two seconds for initializing
}

void loop() {
  
  hum = dht.readHumidity();
  temp = dht.readTemperature();
  ldr = analogRead(25);
  button1 = digitalRead(27);
  if (button1 == 0){
    if (statusbut == 0){
      statusbut = 1;
    }else {
      statusbut = 0; 
    }
  }
  Serial.print("button ");
  Serial.println(statusbut);
  Serial.print("Temp ");
  Serial.print(temp);
  Serial.print(" C, ");
  Serial.print("Humi ");
  Serial.println(hum);
  Serial.print("LDR ");
  Serial.println(ldr);

display_oled(); //void
delay(500); 

}

void display_oled(){
  oled.clearDisplay(); 
  oled.setTextSize(1);         
  oled.setTextColor(WHITE);    
  oled.setCursor(0, 0);       
  oled.println("DHT LDR BUTTON LCD");
  
  if (statusbut == 0){
      oled.setCursor(0, 16);       
      oled.println("Button : ");     
      oled.setCursor(0, 24);       
      oled.println("Temp C : ");
      oled.setCursor(0, 32); 
      oled.println("Humi % : "); 
      oled.setCursor(48, 16);       
      oled.println("DHT");
      oled.setCursor(48, 24);       
      oled.print(temp,1);
      oled.setCursor(48, 32);       
      oled.println(hum,1);
      
    }else {
      
      oled.setCursor(0, 16);       
      oled.println("Button : ");      
      oled.setCursor(0, 24);       
      oled.println("LDR    : "); 
      oled.setCursor(48, 16);       
      oled.println("LDR");
      oled.setCursor(48,24);       
      oled.print(ldr);
      
    }
  oled.display();              
}