#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#include "DHT.h"

#include <Servo.h>

Servo myservo;  // create servo object to control a servo
// twelve servo objects can be created on most boards

int pos = 0;    // variable to store the servo position

int buz = 0;    // variable to store the servo position
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 32 // OLED display height, in pixels
#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);



#define DHTPIN 7
#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  myservo.attach(8);  // attaches the servo on pin 8 to the servo object

  // initialize Buzzer pins
  pinMode(11, OUTPUT);
  Serial.begin(9600);
  dht.begin();
  Serial.println(F("DHT Ready to go!"));
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }

  display.display();
  delay(1000); // Pause for 2 seconds

  // Clear the buffer
  display.clearDisplay();
}

void loop() {
  display.clearDisplay();
  display.setTextSize(2); // Draw 2X-scale text
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);

  float h = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float t = dht.readTemperature();
  if (isnan(h) || isnan(t)) {
    Serial.println(F("Failed to read from DHT sensor!"));
    return;
  }
  buz = map(h, 0, 100, 100, 1000);
  pos = map(t, 25, 75, 0, 130);
  myservo.write(pos);              // tell servo to go to mapped position in variable 'pos'
  delay(15);

  display.print(F("Hr: "));
  display.print(h);
  display.println(F("%"));
  display.print(F("T: "));
  display.print(t);
  display.println(F("C"));
  display.display();
  delay (1000);
  display.clearDisplay();

  Serial.print(F("buz: "));
  Serial.print(buz);
  Serial.print(F("Angle: "));
  Serial.println(pos);

  Serial.print(F("Humidity: "));
  Serial.print(h);
  Serial.print(F("%  Temperature: "));
  Serial.print(t);
  Serial.println(F("°C "));

  alarm();

}

void alarm() {
  tone(11, buz); // turn on arduino active buzzer
  delay(1000);
  noTone(11);  // disable arduino active buzzer
  delay(500);
}