#include <SoftwareSerial.h>
#include "DHT.h"
#define DHTPIN 3
#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

#include <Wire.h>

int LED = 2;
SoftwareSerial BT(10, 11);

void setup() {
  BT.begin(9600);
  pinMode(LED, OUTPUT);
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  byte cmd[20];
  int strsize;
  while (true) {
    if ((strsize = (BT.available())) > 0) {
      for (int i = 0; i < strsize; i++) {
        cmd[i] = char(BT.read());
      }
      Serial.println(cmd[0]);
    }
    if (cmd[0] == 'a') {
      digitalWrite(LED, HIGH);
    } else if (cmd[0] == 'b') {
      digitalWrite(LED, LOW);
    } else if (cmd[0] == 'c') {
      float h = dht.readHumidity();
      float t = dht.readTemperature();
      char hum_buf[10], tem_buf[10];
      if (!isnan(h) && !isnan(t)) {
        dtostrf(h, 3, 2, hum_buf);
        dtostrf(t, 3, 2, tem_buf);
        for (int i = 0; i < 5; i++) {
          BT.write(hum_buf[i]);
        }
        for (int i = 0; i < 5; i++) {
          BT.write(tem_buf[i]);
        }
      }
      cmd[0] = 'd';
    }
  }
}