Arduino BLE Shield ( http://redbearlab.com/bleshield/ ) + Grove Temperature Sensor ( http://www.seeedstudio.com/wiki/Grove_-_Temperature_Sensor )

Arduino + BLE Shield + BlinkM + Grove Temperature Sensor

#include <Arduino.h>
#include <SPI.h>
#include "ble.h"

#include <Wire.h>
#include "BlinkM_funcs.h"
 
// blinkM
#define blinkm_addr 0x00

// temp
#include <math.h>
int a;
float temperature;
int B=3975;                  //B value of the thermistor
float resistance;

char buf[5] = {0};

void setup()
{
  SPI.setDataMode(SPI_MODE0);
  SPI.setBitOrder(LSBFIRST);
  SPI.setClockDivider(SPI_CLOCK_DIV16);
  SPI.begin();
  
  ble_begin();
  
  Serial.begin(57600);
  
  // blinkM Setup 
  pinMode(13,OUTPUT);
  BlinkM_beginWithPower();
  BlinkM_stopScript( blinkm_addr );  // turn off startup script
}

int val;

void loop()
{
  while ( ble_available() ){
    if( ble_available()>0){
      val=ble_read();
    }
    
    if(val=='w'){
      BlinkM_fadeToRGB(blinkm_addr,0xff,0xff,0xff);
      digitalWrite(13,HIGH);
       ble_write('w');
    }
    
    if(val=='r'){
      BlinkM_fadeToRGB(blinkm_addr,0xff,0x00,0x00);
      digitalWrite(13,HIGH);
      ble_write('r');
    }
    
    if(val=='b'){
      BlinkM_fadeToRGB(blinkm_addr,0x00,0x00,0x00);
      digitalWrite(13,LOW);
      ble_write('b');
    }
    
    if(val=='t'){
      BlinkM_fadeToRGB(blinkm_addr,0x00,0xff,0x00);
      digitalWrite(13,LOW);
      
      a=analogRead(0);
      resistance=(float)(1023-a)*10000/a; //get the resistance of the sensor;
      temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;//convert to temperature via datasheet ;
      
      dtostrf(temperature, 4, 2, buf);
      for (int i = 0; i < 5; i++)
        ble_write(buf[i]);
    }
  }
  ble_do_events();
}