#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 4


#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);


OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

int temperature = 0;


#define DHTPIN 2     // Digital pin connected to the DHT sensor

// Uncomment the type of sensor in use:
//#define DHTTYPE    DHT11     // DHT 11
#define DHTTYPE    DHT22     // DHT 22 (AM2302)
//#define DHTTYPE    DHT21     // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  Serial.print("starting");
  dht.begin();
  sensors.begin();


  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

}

void loop() {
  delay(200);
  sensors.requestTemperatures();
  temperature = sensors.getTempCByIndex(0);

  //read temperature and humidity and put in variables t and h
  float t = dht.readTemperature();
  float h = dht.readHumidity();
  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
  }

  //clear display
  display.clearDisplay();

  // display temperature
  display.setTextSize(1);
  display.setCursor(0,6);
  display.print("Temperature: ");
  display.setTextSize(2);
  display.setCursor(18,16);
  display.print(t);
  display.print(" ");
  display.setTextSize(1);
  display.cp437(true);
  display.write(167);
  display.setTextSize(2);
  display.print("C");
  Serial.print(t);
  // display humidity
  display.setTextSize(1);
  display.setCursor(0, 40);
  display.print("Humidity: ");
  display.setTextSize(2);
  display.setCursor(18, 50);
  display.print(h);
  display.print(" %"); 

  //display soil temp
  display.setCursor(0, 50);
  display.print("Soil temp: ");
  display.setTextSize(2);
  display.setCursor(18, 50);
  display.print(temperature);
  
  display.display(); 
  delay(2000);
}