#include <Stepper.h>
#include <LiquidCrystal_I2C.h>

const int stepsPerRevolution = 200;
Stepper myStepper(stepsPerRevolution, 3, 8, 12, 13);

LiquidCrystal_I2C lcd_1(0x27, 16, 2);
LiquidCrystal_I2C lcd_2(0x28, 16, 2);
LiquidCrystal_I2C lcd_3(0x29, 16, 2);

#include <Keypad.h>
const byte ROWS = 4;
const byte COLS = 4;
char haxaKeys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[ROWS] = {11, 10, 9};
byte colPins[COLS] = {7, 6, 5, 4};

Keypad customKeypad = Keypad( makeKeymap(haxaKeys), rowPins, colPins, ROWS, COLS);


#include <DHT.h>
#define DHTPIN 2
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);


void setup() {
  lcd_1.init();
  lcd_2.init();
  lcd_3.init();
  
  lcd_1.backlight();
  lcd_2.backlight(); 
  lcd_3.backlight();
  
  lcd_1.print("Temperature");
  lcd_2.print("Humidity");
  lcd_3.print("Step Engine");

  dht.begin();
}

void loop() {
  int sensor = analogRead(A0);
  int motorSpeed = map(sensor, 0, 1023, 5, 200);
  myStepper.setSpeed(motorSpeed);
  myStepper.step(stepsPerRevolution/100);

  char customKey = customKeypad.getKey();
  
  if (customKey) {
    switch(customKey) {
  	case 'A':
      	lcd_1.clear();
    	lcd_1.setCursor(0, 0);
      
    	lcd_1.print("Temperature:");
      	lcd_1.setCursor(0, 1);
      	lcd_1.print(String(getTemperature()) + " C");
    	break;
    case 'B':
      	lcd_2.clear();
    	lcd_2.setCursor(0, 0);
      
    	lcd_2.print("Humidity:");
      	lcd_2.setCursor(0, 1);
      	lcd_2.print(String(getHumidity()) + " %");
    	break;
    case 'C':
    	lcd_3.clear();
      	lcd_3.setCursor(0, 0);
      	lcd_3.print("Step Engine:");
      	lcd_3.setCursor(0, 1);
      	lcd_3.print(String(motorSpeed) + " rpm");
    	break;
  	}
  } 
}

float getTemperature() {
  return dht.readTemperature();
}

float getHumidity() {
  return dht.readHumidity();
}