You will never have to find your light switch again in the night, just walk into your bathroom and lights are on.
Control your heating with this simple device that is easy to modify. You can control your sunblinds or boiler for optimal temperature.
Make an affordable but smart Alarm system for your home, or any of your buildings. It can run up to 2 years just from batteries.
With this project you can play any sound from your SD card on your audio system. Only wire you will need is 3.5mm jack.