[Randomskk] has been attempting to make electronic fireflies for quite a long time and finally settled on a design he liked. His jar of fireflies utilizes an ATtiny13 to manage a set of 12 matrixed LEDs. The green SMD LEDs are each soldered to a pair of thin wires that hang down into the jar. The software application picks an LED at random to flash and then flashes it 1-3 times. The random seed is incremented each time the jar is turned on, so you’ll get 255 different patterns. The power is just a common coin cell. The project is fairly easy electrically, but the LED soldering could verify difficult. It was influenced by this firefly jar project. inspect out [Alex]’s synchronizing fireflies too. A video of the jar is available below.
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