- on Hobby & Modelling
- Published in issue 1/2009 on page 28
Three-Dimensional Light Source
Programmable LED matrix with 125 LEDs
This magnificent cube has at its heart an Atmel AVR microcontroller. These controllers are easy to obtain and superb open-source tools are available. Not only for Windows, but also for the Linux and Mac operating systems.
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.
- 125 LEDs in a special 3D matrix
- ATMEGA32 microcontroller running @ 1 MHz internal clock
- 10-way ISP-connector for reprogramming
- 5 transistors for switching the layers
- 25 transistors for switching the columns
R1 = 100kohm
R2-R6 = 330ohm
R7-R14, R31-R38, R47-R55 = see text
R15-R30, R39-R46, R56 = 1kohm8
C2,C3 = 100nF
C4 = 1uF 100V
IC1 = 7805
IC2 = Atmega32
D1 = 1N4001
T1-T5 = BC337
T6-T30 = BC547
125 LEDs for cube
10-way boxheader (2x5), 2.54mm lead pitch
10-way SIL pinheader (IC socket)
Heatsink, TO-220, 5°K/W for IC1
4 off M3x5 bolt with 10-mm long hex spacers
Mains adapter socket for 2.5mm pin diam.
PCB, order code 080355-1 from the Elektor SHOP.