Fridge open door detector

Our fridge door sometimes doesn't close completely. To become aware of a not correctly closed door immediately (instead of after a night) I created this open-door-detector.
As a side effect you also get a beep-notification when making your choice while the door is open takes too long ;-)

The door open detection is done by a micro switch. It closes on opening the door and thereby provides power to the circuit which contains an Arduino based microcontroller (ATmega328) and a spare piezo speaker.

Note that instead of a complete Arduino board only the Atmega328P is used on a breadboard. See the [clip by Julian Ilett](https://www.youtube.com/watch?v=sNIMCdVOHOM) on how to do this. (But I needed an extra 10 kOhm pullup on the reset pin 1 during data transfer.)

The file "ArduinoToneMelody.ino" contains the program:
* On opening the door the LED starts to blink.
* After 10, 20 and 30 seconds the program will do 1, 2 and 3 beeps respectively.
* After 40, 50 and 60 seconds a siren s