In previous article I made a simple Arduino Chriostmas tree on breadboard with 9 leds, now I use a big piece of cardboard and cutter... I use 21 recovered leds (old leds) on 17 channels (I put 2 red leds in series) as in this schematic
I use Arduino Nono board with ATmega168 because sketch is small (see christmas_tree_17channels.ino), but hase interesting effects (random leds lite, random delay between commands, random leds off), as in Carton Christmas tree with leds movie:
After the Christmas tree was adorned I made new movies:
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