A 50 min max kitchen timer with time displayed as LED's on a bar graph - each LED representing five mins. Pressing the button adds five mins to timer.
This project is very easy to build. Simply wire up your Arduino like the Fritzing diagram suggests, and load on the already tested code. I am not yet aware if the piezo buzzer system works as I have not got one to test with, but in theory, it should. Because of the code used to program the Arduino, one needs to press reset before pressing and holding the main pushbutton as LED's are counted up. E.G. 1 LED lit = 5 mins, 2 = 10 mins etc.
If you find anything wrong with the code, have any trouble with making it, or anything else - feel free to contact me.