All posts in the 'LED projects' Category
KaptinScarleton writes:
You saw Batman Begins, you’ve now seen The Dark Knight, and now go on admit it, you want one of those mega spotlights with which Commissioner Gordon summons the help of the Caped Crusader. But you don’t have a gigawatt three phase power supply, all you have is a measly little 5V USB… don’t despair, that’s plenty to work with, and if you follow this instructable you’ll be casting the most wicked bat shaped shadows all over your bedroom, living room and office walls.
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They consist of a blue LED and an ATTiny13 microcontroller and they pulse with a slow, compelling sine wave. Selecting the timing of the sine wave was an important consideration, but it was necessary to make a choice about the frequency of the wave oscillation before programming the ATTiny microprocessors and inserting them into the balloons. [more]
Here is an experiment with an 8ร8 LED matrix, driven by a MAX7219 IC, controlled through an Arduino micro-controller board. A custom PCB has been made by Tan from DinoTech to tidy up all the wires connecting the LED matrix and the IC. It comes with a separate 12V power supply, in order not to drain everything from the Arduino board.[more]
This is a low power voltmeter circuit that can be used with alternative energy systems that run on 12 and 24 volt batteries. The voltmeter is an expanded scale type that indicates small voltage steps over the 10 to 16 volt range for 12 volt batteries and over the 22 to 32 volt range for 24 volt batteries. Power consumption can be as low as 14mw when operated from 12V and 160mw when operated from 24V.[more]
This circuit simulates fireflies with small microcontrollers. Note that every firefly acts completely autonomously, it is not a preprogrammed pattern. It is a self organizing system.
This is a remake of the fireflies which I did a year ago. I was always fascinated by the emergence of patterns. One I like most is the synchronization of hundreds or thousands of fireflies. First they flash randomly but after some time and influencing each other, they flash in sync.
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