Bluetooth temperature monitor

btmon.ino

/*
 * Author: David Castellà <d.castella.85 at gmail dot com>
 * Sketch title: Bluetooth temperature monitor
 * Sketch filename: btmon.ino
 * Date: 2014/05/21
 * Version: 0.1
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#include <OneWire.h>
#include <SoftwareSerial.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS 2

#define RxD 10
#define TxD 11
#define KEY 4

#define LED 2

/**/
#define userid 1
/**/

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

SoftwareSerial BTSerial(RxD, TxD);
byte pinEstado = 0;

void setup() {
    pinMode(LED, OUTPUT);
    pinMode(KEY, OUTPUT);
  
    pinMode(13, OUTPUT);
    digitalWrite(13, LOW);

    digitalWrite(LED, LOW);
    digitalWrite(KEY, LOW); 
  
    BTSerial.begin(9600);
    BTSerial.flush();
    delay(500);
  
    Serial.begin(9600);
    Serial.flush();
    Serial.println("Ready");
  
    sensors.begin();
}

void loop() {
    char command;
    float temp;
    String response = "";
    if (BTSerial.available()) {
        command = BTSerial.read();
        BTSerial.flush();
        Serial.println("Received request for temperature");

        if (command == 'T') {
            Serial.println("Sending response with temp value: ");
            temp = getTemp();
            Serial.print(userid);
            Serial.print("/");
            Serial.println(temp);
            BTSerial.print(userid);
            BTSerial.print("/");
            BTSerial.println(temp);
        }
    }
}


float getTemp() {
    sensors.requestTemperatures();
    return sensors.getTempCByIndex(0);
}