#include <Servo.h>

#include <Wire.h> 
 #include <Adafruit_Sensor.h> 
 #include <Adafruit_BME280.h> 
 #include <Adafruit_GFX.h>       
 #include <Adafruit_SSD1306.h>   
 #define SCREEN_WIDTH 128  
 #define SCREEN_HEIGHT 32  
 #define OLED_RESET  4     
 Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET); 
 Adafruit_BME280 bme; // I2C 
 unsigned long delayTime; 

#define potpin A0 // analog pin used to connect the potentiometer
#define buzzer 6
#define button 9
#define led 3               // the pin that the LED is attached to
#define sensor 5             // the pin that the sensor is attached to

int state = LOW;             // by default, no motion detected
int val1 = 0;                 // variable to store the sensor status
int buttonState = 0;


Servo myservo;


int val;    // variable to read the value from the analog pin

void setup() {
  pinMode(led, OUTPUT);      // initialize LED as an output
  pinMode(sensor, INPUT);    // initialize sensor as an input

  Serial.begin(9600);        // initialize serial
  Serial.println("Motion Sensor Activated!"); 
    unsigned status = bme.begin(0x76); 
    if (!status) { 
        Serial.println("Could not find a valid BME280 sensor, check wiring!"); 
        while (1); 
    } 
    display.begin(SSD1306_SWITCHCAPVCC, 0x3C); 
    delay(5000); 
  pinMode(buzzer, OUTPUT);
  pinMode(button, INPUT);
  myservo.attach(A1);  // attaches the servo on pin 9 to the servo object
}
void pot_loop(){
  val = analogRead(potpin);            // reads the value of the potentiometer (value between 0 and 1023)
  val = map(val, 0, 1023, 0, 180);     // scale it to use it with the servo (value between 0 and 180)
  myservo.write(val);                  // sets the servo position according to the scaled value
  delay(15);                           // waits for the servo to get there
  if(val<= 2){
    display.clearDisplay(); 
    display.setTextSize(2); 
    display.setTextColor(WHITE, BLACK); 
    display.setTextWrap(false); 
    display.setCursor(0, 0); 
    display.println("OPEN"); 
    display.display();
    delay(1000);
  }
  else if(val>=3 && val<=178){
    OLED_loop();
  }
  else{
        display.clearDisplay(); 
    display.setTextSize(2); 
    display.setTextColor(WHITE, BLACK); 
    display.setTextWrap(false); 
    display.setCursor(0, 0); 
    display.println("CLOSE"); 
    display.display();
    delay(1000);
  }
}
void buzzer_loop(){
    tone(buzzer, 330); // tone(PIN, FREQUENCY)
    delay(400);
    tone(buzzer, 390);
    delay(400);
    tone(buzzer, 260);
    delay(400);
    noTone(buzzer);
    delay(400);
    tone(buzzer, 330);
    delay(400);
    tone(buzzer, 390);
    delay(400);
    tone(buzzer, 260);
    delay(400);
    noTone(buzzer);
    delay(1000);
}
void butt_loop(){
  buttonState = digitalRead(button); // checks the status of the button
  if(buttonState == HIGH) { // plays the doorbell melody if the button is pressed
  buzzer_loop();
  } 
}
void motion_loop(){
  val1 = digitalRead(sensor);   // read sensor value
  if (val1 == HIGH) {           // check if the sensor is HIGH
    digitalWrite(led, HIGH);   // turn LED ON
    delay(100);                // delay 100 milliseconds 
    
    if (state == LOW) {
      Serial.println("Motion detected!"); 
      state = HIGH;       // update variable state to HIGH
    }
  } 
  else {
      digitalWrite(led, LOW); // turn LED OFF
      delay(200);             // delay 200 milliseconds 
      
      if (state == HIGH){
        Serial.println("Motion stopped!");
        Serial.println("");
        state = LOW;       // update variable state to LOW
    }
  }
}

void OLED_loop() { 
    display.clearDisplay(); 
    display.setTextSize(2); 
    display.setTextColor(WHITE, BLACK); 
    display.setTextWrap(false); 
    display.setCursor(0, 0); 
    display.print(bme.readTemperature()); 
    display.println("*C"); 
    display.display(); 
    delay(1000); 
 } 
void loop() {
  
  pot_loop();
  butt_loop();
  motion_loop();
}