#define red_led 9
#define green_led 11
#define blue_led 10
#define dht22_sensor 7
#define buzzer 6

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

DHT my_dht(dht22_sensor, DHT22);
Adafruit_SSD1306 display(128, 64, &Wire, -1);

float temp = 0.0;
float hum = 0.0;


void setup() {
  my_dht.begin();
  display.begin(SSD1306_SWITCHCAPVCC, 0x3c);
  Serial.begin(9600);
  pinMode(red_led, OUTPUT);
  pinMode(green_led, OUTPUT);
  pinMode(blue_led, OUTPUT);
  pinMode(buzzer, OUTPUT);
}

void loop() {
  display.clearDisplay();
  float temp = my_dht.readTemperature();
  float hum = my_dht.readHumidity();
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0,0);
  display.setTextSize(1);
  display.print(temp);

  display.setCursor(0,20);
  display.setTextSize(1);
  display.print(hum);
  display.display();

  Serial.print("Temperature in Celsius:");
  Serial.print(temp);
  Serial.print("Humidity in %:");
  Serial.print(hum);

  if(temp<=20.0) {
    digitalWrite(blue_led, HIGH);
    digitalWrite(green_led, LOW);
    digitalWrite(red_led, LOW);
    noTone(buzzer);
  }
  else  if (temp<=30.0){
    digitalWrite(blue_led, LOW);
    digitalWrite(green_led, HIGH);
    digitalWrite(red_led, HIGH);
  }
  else {
    digitalWrite(blue_led, LOW);
    digitalWrite(green_led, LOW);
    digitalWrite(red_led, HIGH);
    tone(buzzer, 7000);
  }
  delay(2000);
}