Me and my friend Nikos have created this little robot that has a hypersonic sensor that detects when you get close to it, and it triggers an alarm to go off. This actually is commonly used on cars.
Here is a video of the robot in action:
Here are some photos of the robot:
Also feel free to check out the source code here
Cup-O-Meter is a device that will count for you how many bottle caps you have collected. It is a very simple device that uses various sensors to count the caps and display the number on a LCD display.
We made this device for our school. In Greece, schools collect bottle caps and sell them to recycling companies. The money from the caps is used to buy whealchairs for disabled people.
The source code can be found here.
This webpage is protected by the GNU Public Licence 3.0. Refer to source as "Odysseus-Abraham Kirikopoulos" when distributing the software.