Doce uvas (Twelve Grapes) bell and led bolls

What is it?

In Spain the typical celebration at new years midnight is to eat twelve grapes, one at every strike of the bell.
Wiki even has some pages of it https://es.wikipedia.org/wiki/Doce_uvas and https://en.wikipedia.org/wiki/Twelve_Grapes

In order to achieve this celebration in places without a big bell in the square or TV, I have created this small project for it.

Eagle layout

For this project I’m trying out circuits.io

Arduino code

All the code can be found on my github: https://github.com/timdows/AMD/tree/master/GrapeLedsBell

It uses the Adafruit WS2801 library to control the string of led bolls.
Upon startup and in ‘waiting mode’ it runs the rainbowCycle in a quick finite state machine.
A push button starts of the program after 5 seconds.

The program expects that upon startup the clapper is against the bell.
It runs the first 11 times normal and the last time it hits the bell 5 times in a quick sequence.
Upon every ring a new led boll changes from red to green.

End result

Project costs in € or $

Object	Price
Arduino Pro Mini 5V	$ 1.92
EasyDriver Shield stepping Stepper Motor Driver V44 A3967 For Arduino	$ 4.44
16mm LED Momentary Push Button Switch	$ 2.81
12 pcs 50mm full color 6LEDS 5050 RGB WS2801 Pixel Module Ball 12V	$ 35.39
Other materials	$ 5
Total	$ 49.56

What could be better

1. Have a countdown timer on it;
2. Find cheaper parts.