• on Miscellaneous Electronics
  • Published in issue 7/2010 on page 30
About the article

3D LED Pyramid

(Summer Circuits 2010 article)

3D LED Pyramid

The author ‘just wanted to do a bit of microcontroller programming’. However, the project rapidly grew into this impressive and visually attractive pyramid. The circuit consists essentially of a specially-sawn printed circuit board, 23 LEDs and a microcontroller. Despite the fact that the microcontroller is a rather modest Atmel ATtiny2313, the author nevertheless has found room in the 2 KB flash memory for 16 different light sequences.

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Gerber file

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.

Resistors
R1–R8,R11,R12,R13 = 4.7kOhm
R9,R10 = 1kOhm
R14–R36 = 56Ohm

Capacitors
C1 = 220µF 16V
C2,C4 = 100nF
C3 = 22µF 16V

Semiconductors
D1–D23 = SMD ED, wide angle e.g. LO L296
T1–T11 = BC817-40
IC1 = ATtiny2313-20SU (SMD), programmed

Miscellaneous
K1–K4 = solder points
K5 = 6-pin (2x3) pinheader, lead pitch 0.1 inch (2.54mm)
S1 = pushbutton
S2,S3 = 3-pin pinheader, lead pitch 0.1 inch (2.54mm)
Copper wire 1.5mm2 csa, l = 110mm
Copper wire 1.5 mm2 csa, l = 55mm
PCB # 090940-1
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