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Inspired by the Crystal Eye LED tail lights found on the Subaru/Toyota/Scion BRZ/FRS/GT86. I think I might do this. LED DIY ftw!
Trinity Church, Copenhagen. While we were there, the organist played Widor's Toccata from the Fifth Organ Symphony in F, the same music that led my wife and me down the aidsle after our wedding. Marvellous!
Structure supporting a large (approx. 7.5m x 5m) LED matrix display for road-side advertising. The display is seen by motorists on the Hammersmith Flyover. London Borough of Hammersmith & Fulham.
The first scratch-built component for my current project is just about ready. It is all soldiered (and yes, I've tested all the connections).
Next up is wiring up its partner and then linking the two together.
An ATtiny13 uses PWM to fade 12 0603 surface mount green LEDs in and out, suspended from the PCB inside a jam jar. The ATtiny13 picks a random LED to flash each time, flashes it once, twice or three times randomly, then waits a random amount of time before flashing the next one. An incrementing counter is stored in EEPROM and used to seed the random number generator, leading to a different sequence each time the device is powered up via the switch mounted on the top. The LEDs are arranged in a standard 3x2 matrix which gives 6 LEDs, and for each position there is a second LED in reverse. The two column controllers are PB0 and PB1 as they can do PWM - another two LEDs could be added between PB0 and PB1 (and were on the prototype) but made the PCB design needlessly more complex: 12 is more than enough!
Watch the video of them in action here: uk.youtube.com/watch?v=0Yk0CZp2Ywc
Inspired by: www.instructables.com/id/Jar-of-Fireflies/http://negative...
More info and source files:
negativeacknowledge.com/2008/10/18/led-fireflies-in-a-jar...
This image is on Flickr because I put it in my personal journal today. dennissylvesterhurd.blogspot.com/2025/08/something-to-do-...