12 LED KITT-scanner / Cylon-eye with trail effect
The famous visual effect from the TV-series Battlestar Galactica and Knight Rider

Download the ATtiny15L datasheet.
A 12 LED KITT scanner with trail.

Often this kind of gadgets have no trail effect, but just a single LED moving visually back and forth. In the TV-series Knight Rider or Battlestar Galactica you saw clearly a trail effect in the visual motion, the same way you see in the gif animation on this webpage. Here one with a trail effect, using an ATtiny15L AVR microcontroller, and applied a technique called charlieplexing.
Part list:

1x ATtiny15L
2x 1N4007
1x 78L05
12x low-current LED
4x 47 ohm
1x 10k
2x 100n
1x 47uF/16V
Download this *.hex datafile, and dump it into an ATtiny15L AVR microcontroller with e.g. this programmer.

Have fun!


12 LED KITT scanner
Prototype of the KITT-scanner on a small piece of veroboard
Diagram of a 12 LED KITT scanner (charlieplexed)

Diagram of the 12 LED charlieplexed KITT-scanner / Cylon-eye (without speed adjust)


A 20 LED circular effect
A tiny 20 LED circular effect
Download the ATtiny12 datasheet.
Round 20 LED effect
The circuit diagram 20 LED effect
A 20 LED circular effect.

text.
20 LED round LED effect
A round 20 LED effect (charlieplexed)


Part list:

1x ATtiny12 SOIC
20x red LED 1206
5x 47 ohm 0805
1x 10k 0805
2x 100n 0805