#include <DHT.h>
#include <LiquidCrystal_I2C.h>;
#include <Wire.h>
#include <Keypad.h>

#define DHTPIN 13
#define DHTTYPE DHT22

int totalColumns = 20;
int totalRows = 4;
LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, totalColumns, totalRows);

// define DHT infomation
DHT dht(DHTPIN, DHTTYPE);

// Define Keypad 4x4 information
const uint8_t ROWS = 4; /* four rows */
const uint8_t COLS = 4; /* four columns */
/* define the symbols on the buttons of the keypads */
char keys[ROWS][COLS] = {
  { '1', '2', '3', 'A' },
  { '4', '5', '6', 'B' },
  { '7', '8', '9', 'C' },
  { '*', '0', '#', 'D' }
};
uint8_t colPins[COLS] = {19, 18, 17, 16}; // Pins connected to C1, C2, C3, C4
uint8_t rowPins[ROWS] = {35, 34, 33, 32}; // Pins connected to R1, R2, R3, R4

/* initialize an instance of class NewKeypad */
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

float _temp, _humi;

void setup() {
  Serial.begin(115200);
  // initialize LCD
  LCD.init();
  // turn on LCD backlight                      
  LCD.backlight();

  dht.begin();
}


void loop() {
  // Read Humidity
  float _humi = dht.readHumidity();
  // Read temperature
  float _temp = dht.readTemperature();

//  // Check if any reads failed and exit early (to try again).
//  if (isnan(_humi) || isnan(_temp)) 
//  {
//    LCD.println("Failed to read from DHT sensor!");
//  }
//  else
//  {
//    // set cursor to first column, first row
//    LCD.setCursor(0, 0);
//    LCD.print("Temperature: ");
////    LCD.print(_temp);
//    LCD.print("35");
//    LCD.print("C");
//    
//    LCD.setCursor(0, 1);
//    LCD.print("Humidity: ");
////    LCD.print(_humi);
//    LCD.print("70");
//    LCD.print("%");
//    delay(1000); 
//  }
  char key = keypad.getKey();

  if (key) {
    Serial.println(key);
  }
}