Doce uvas (Twelve Grapes) bell and led bolls

What is it? questionmark

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 and

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.

Yup that is a screw as clapper
Dong dong dong

Eagle layout questionmark

For this project I’m trying out

Arduino code questionmark

All the code can be found on my github:

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 questionmark

Work in progress
Bottom of the protoboard
Slamming it all together in a nice box
Led bolls in the dark
Led bolls in the dark
Half in the program

Project costs in € or $ questionmark

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 questionmark

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

31 thoughts on “Doce uvas (Twelve Grapes) bell and led bolls”

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