I made a weather station connected to the internet. It measures temperature, humidity, UV index, rainfall and it calculates few more important meteorological values. It then sends this data to, which has nice graphics and UX. It also has a weather web camera. It cost me around 150€. I made this station as my school project.

Room Automation Control Using Arduino and Android

This is room automation system, depending on the environment change in our room we can automate our electric devices. If the temperature is high then we can switch ON the fan, if the darkness in the room and motion sensed by the sensors we can turn ON the Bulbs by sending commands from our mobile to the controller.