#include <LiquidCrystal.h>
#include <Stepper.h>
#include <Servo.h>

// LCD screen pins
const int LCD_RS = 0, LCD_E = 1, LCD_D4 = 4, LCD_D5 = 5, LCD_D6 = 6, LCD_D7 = 7;
LiquidCrystal lcd(LCD_RS, LCD_E, LCD_D4, LCD_D5, LCD_D6, LCD_D7);

// Photo resistor
#define LDR_PIN A1

// LDR Characteristics
const float GAMMA = 0.7;
const float RL10 = 50;

// Temp sensor
const float BETA = 3950; // should match the Beta Coefficient of the thermistor
#define PR_PIN A0

// LED pin
#define LED_PIN 9

// stepper motor
const int stepsPerRevolution = 200;  // change this to fit the number of steps per revolution
// for your motor
Stepper bigStepper(stepsPerRevolution, 35, 33, 31, 29);

// Button
#define BUTTON_PIN 19
int lastState = HIGH;

// Servo
const int SERVO_PIN = 8; // Servo control pin
Servo myservo;

// distance transducer
const int TRIG_PIN = 21; // Trigger pin for the ultrasonic sensor
const int ECHO_PIN = 20; // Echo pin for the ultrasonic sensor

void setup() {
  Serial.begin(115200);
  // put your setup code here, to run once:
  pinMode(LDR_PIN, INPUT);
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_PIN, OUTPUT);
  // set the speed at 60 rpm:
  bigStepper.setSpeed(60);
  // Button
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  //Servo
  myservo.attach(SERVO_PIN); // Attach servo to designated pin 
}

void loop() {
  // put your main code here, to run repeatedly:

  //Button
  int value = digitalRead((BUTTON_PIN));
  if (lastState != value) {
    lastState = value;
    if (value == HIGH) {
      Serial.println(" released");
    }
    if (value == LOW) {
      Serial.println(" pressed");
    }
  }

  // photo resistor
  int analogValue1 = analogRead(A1);
  float voltage = analogValue1 / 1024. * 5;
  float resistance = 2000 * voltage / (1 - voltage / 5);
  float lux = pow(RL10 * 1e3 * pow(10, GAMMA) / resistance, (1 / GAMMA));
  Serial.print(lux);
  Serial.print(" lux. ");

  // Temp sensor
  int analogValue2 = analogRead(A0);
  float celsius = 1 / (log(1 / (1023. / analogValue2 - 1)) / BETA + 1.0 / 298.15) - 273.15;
  Serial.print("Temperature: ");
  Serial.print(celsius);
  Serial.println(" C");

  // LED
  digitalWrite(LED_PIN, HIGH);   // turn the LED on (HIGH is the voltage level)  

  // big stepper
  // step one revolution  in one direction:
  Serial.println("  Direction :: clockwise  ");
  bigStepper.step(stepsPerRevolution);
  
  // Servo
  myservo.write(180); // Open door

  delay(1000); 
  digitalWrite(LED_PIN, LOW);    // turn the LED off by making the voltage LOW
  // step one revolution in the other direction:
  Serial.println("  Direction :: counterclockwise  ");
  bigStepper.step(-stepsPerRevolution);
  myservo.write(0); // Open door
  delay(1000); 




}