Malcolm Maclean is developing an eBook for the Raspberry Pi and it’s available for you to read online. One of the sections of the book is all about the brilliant little BMP180 sensor (pictured above). This sensor, which replaces the larger BMP085, can read temperature, pressure and altitude and then exposes these readings over the I2C bus to the Pi. Malcolm takes you through wiring the sensor up, taking readings and then storing them to a MySQL database. Read more here.
The BMP180 is a great sensor – you can buy one from The Pi Hut for only £2 here – it’s tiny and so easy to use!