/* 
    Why the heart icon? Because I thought it was cool
    and I want to use it in the future with some heartbeat sensor.
    I needed to keep it somewhere and it was here. ;)
 */

#include <dht.h>
#include <TinyWireM.h>
#include <Tiny4kOLED.h>

#define DHT22_PIN PB1

const unsigned char  img_thermometer[] PROGMEM = {
  0x00, 0xfe, 0x03, 0xfe, 0x50,
  0x00, 0xff, 0x00, 0xff, 0x55,
  0x60, 0x9f, 0x80, 0x9f, 0x65,
};

dht DHT;

void splash() {
  oled.clear();
  oled.setCursor(50, 0);
  oled.print(F("Mini"));

  oled.setCursor(5, 2);
  oled.print(F("Weather Station"));

  oled.setCursor(20, 4);
  oled.print(F("IoT Projects"));

  oled.setCursor(50, 6);
  oled.print(F("Ideas"));
}

void prepareDisplay() {
  unsigned int i, k;
  unsigned char ch[5];

  oled.clear();
  oled.begin();

  oled.setCursor(15, 0);
  oled.print(F("ATtiny85 Mini"));
  oled.setCursor(1, 2);
  oled.print(F("Weather Station"));

  oled.bitmap(2, 5, 7, 8, img_thermometer);
  oled.setCursor(15, 4);
  oled.print(F("Temp: 32.0 °C"));
  oled.setCursor(15, 6);
  oled.print(F("Humi: 67.0 %"));
}

float getTemperature() {
  return DHT.temperature;
}

float getHumidity() {
  return DHT.humidity;
}

void setup() {
  pinMode(DHT22_PIN, INPUT);

  oled.begin(128, 64, sizeof(tiny4koled_init_128x64br), tiny4koled_init_128x64br);

  // Two fonts are supplied with this library, FONT8X16 and FONT6X8
  oled.setFont(FONT8X16);

  // To clear all the memory
  oled.clear();
  oled.on();

  splash();

  delay(3000);
  prepareDisplay();
}

void loop() {
  static long startTime = 0;
  long currentTime;

  DHT.read22(DHT22_PIN);

  // Get current time
  currentTime = millis();

  // Checks 1 second passed
  if ((currentTime - startTime) > 1000) {
    startTime = currentTime;

    // Update temperature
    float temperature = getTemperature();

    // Set cursor
    oled.setCursor(15, 4);
    oled.print("Temp: ");
    // Print to display
    oled.print(temperature, 1);
    oled.print(" °C  ");

    // Update humidity
    float humidity = getHumidity();

    // Set cursor
    oled.setCursor(15, 6);
    oled.print("Humi: ");
    // Print to display
    oled.print(humidity, 1);
    oled.print(" %  ");

    oled.bitmap(2, 5, 7, 8, img_thermometer);
  }
}