Street light controller
Following are some DIY project document links that anyone can build and install for local /self applications.
Wireless Remote control :
Generally we use wireless remote controllers in toys;Lets think  how we can use this remote controller for home automation ? This project explains you in better way how we did this. Please go through this link:Wireless Remote Controller
Automatic Plant watering system:
Water is main source of life !! To save water and to give appropriate water content to plants this circuit works better. If anyone want to replicate it please visit link given here:Plant watering system
Street Light controller :
This circuit saves  electricity consumed by street lights that are ON during day time.Its light dependent switch which works as per light intensity.Go through link fro more details:Street light controller