ADIOS

Buy

http://www.seeedstudio.com/depot/Grove-Digital-Light-Sensor-p-1281.html

Wiki

http://www.seeedstudio.com/wiki/Grove_-_Digital_Light_Sensor

C++ library

https://github.com/Seeed-Studio/Grove_Digital_Light_Sensor

Hardware

Left part cutted and socket removed

Arduino code

#include <Wire.h>
#include <Digital_Light_TSL2561.h>

void setup(void) {
  Wire.begin();
  TSL2561.init();
}

void loop(void) {
  display.println(TSL2561.readVisibleLux());
}

Buy

Wiki

C++ library

Hardware

Arduino code

#include "Barometer.h"
#include 

static float baroTempVal;
static float pressureVal;
static float altitudeVal;
Barometer baro;

void setup(void) {
  baro.init();
}

void loop(void)
{
   baroTempVal = baro.bmp085GetTemperature(baro.bmp085ReadUT());
   pressureVal = baro.bmp085GetPressure(baro.bmp085ReadUP());
   altitudeVal = baro.calcAltitude(pressureVal);

  delay(1000);
}