#include "DHT.h"
#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);
float temperature;
float humidity;
bool temp_mode = false;
int led_time;
int read_wait = 0;
char symbol;

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  Serial.begin(9600);
  dht.begin();
  for (int i = 3; i > 0; i--) {
    Serial.print(i);
    Serial.println("..");
    delay(1000);
  }
  Serial.println("Ready");
}

void loop() {
  if (Serial.available() > 0) {
    symbol = Serial.read();

    if (read_wait < millis()) {
      read_wait = millis() + 1000;
      if (symbol != 10)
      {
        Serial.print(millis());
        Serial.print("|");
        Serial.println(symbol);

        switch (symbol) 
        {
        case 'T':
          Serial.print(millis());
          Serial.print("|");
          temperature = dht.readTemperature(temp_mode);
          Serial.print(temperature);
          if (temp_mode)
          {
            Serial.println('F');
          } else {
            Serial.println('C');
          }
          break;
        case 'H':
          Serial.print(millis());
          Serial.print('|');
          humidity = dht.readHumidity();
          Serial.print(humidity);
          Serial.println("%");
          break;
        case 'F':
          temp_mode = true;
          Serial.println("Pārslēgts uz Farenheita grādiem");
          break;
        case 'C':
          temp_mode = false;
          Serial.println("Pārslēgts uz Celsija grādiem");
          break;
        default:
          Serial.println("Neatbilst nevienai komandai");
          digitalWrite(LED_BUILTIN, HIGH);
          led_time = millis();
          while (millis() < led_time + 1000) {}
          digitalWrite(LED_BUILTIN, LOW);
          break;
        }
      }
    }
  }
}