Jar Of Fireflies

October 18, 2008 by Eliot 14 Comments

[Randomskk] has been attempting to make electronic fireflies for quite some time and finally settled on a design he liked. His jar of fireflies uses an ATtiny13 to control 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 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 standard coin cell. The project is fairly simple electrically, but the LED soldering could prove difficult. It was inspired by this firefly jar project. Check out [Alex]’s synchronizing fireflies too. A video of the jar is available below. Continue reading “Jar Of Fireflies” →

LED POV Hard Drive Clock

October 17, 2008 by Caleb Kraft 29 Comments

[Ian Smith] sent us this POV display made from an old hard drive. It works by flashing some LEDs under the platter, which has a line cut in it. Since the platter spins at roughly 90 rotations per second, we perceive a solid image. He was inspired by [Alan Parekh]’s project, but did several things differently. Mounting the LEDs was much simpler in this project as he had a strip of RGB LEDs that came with adhesive tape on the back. He also used a small magnet and a hall effect sensor to measure full rotations instead of an IR beam sensor. Check the video after the break.

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Wireless Accelerometer Controlled RGB LED

October 9, 2008 by Caleb Kraft 10 Comments

[Andlier] sent us this cool little project. He has built a wireless accelerometer controlled RGB LED lighting system. Based on what a mouth full that is, it sounds complicated right? The end result looks fairly intuitive. Simply pick up the controller and tilt your hand to change the color of the light.

The controller consists of an Atmel AVR168 microcontroller. He doesn’t specify what transceiver he is using, but if you look in the comments, he notes that he added an antenna to it to extend the range. The part that controls the LED is based off of an Atmel AVR169 microcontroller hooked to some shiftbright LED modules.

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Animated LED Eyes For Halloween

October 3, 2008 by Caleb Kraft 5 Comments

[Matt Daughtrey] sent us this sweet little project he’s doing for Halloween. He’s building some animated LED eyes. He says that the whole thing is 3 individual LMDriver platforms, another project he’s working on. There isn’t any info available about that, but he does expand a little. He states that each display module uses an Atmega169 with some heavy multiplexing. The eyes really don’t look that impressive sitting on the bench, but watch the video to see how cool they really are.

We noticed that the back of the boards appear to have http://www.embeddedether.net on them. Unfortunately that site seems to have been grabbed by a domain squatter.

Email Notification Via An RGB LED

September 28, 2008 by Jason Rollette 15 Comments

This project provides LED feedback when an email is received. It uses a 4d-micro-USB module from Dontronics to interface serially and provide power to a Picaxe 08M. The PIC can control color and brightness of a RGB LED. The feedback is given by seven colors of the LED. The code is python script and picaxe basic, which he’s posted.

Accelerometer Controlled Pong

September 23, 2008 by Ian 8 Comments

[youtube=http://www.youtube.com/watch?v=jYVgXYtxk4E]

[Perry’s] awesome AcceLED Pong project gives new life to a classic game by adding acceleration-based control. The pong paddles are moved by tilting the circuit left or right. Motion is measured by an ADXL203 dual axis accelerometer, and an ATMEGA32 microcontroller converts acceleration into ball and paddle movement. The game display is a three-color SparkFun 8×8 LED matrix with serial interface.

[Perry] also used a similar setup to make a USB LED spectrum analyzer fed by the Linux XMMS media player.

Laser POV Projector

September 23, 2008 by Jason Rollette 10 Comments

[shakirfm] sent us this LED persistence of vision (POV) laser projector that can display dot matrix style text. The laser projector contains a rotating mirror assembly and 5 lasers. We’ve covered other POV projectors,but this one is a bit different. The mirror assembly rotates using two cooling fans. Controlling on/off times of the lasers along with the mirror speed, it is able to project 8×5 dot matrix ASCII text onto a surface.
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