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3D LED Pyramid

(Summer Circuits 2010 article)

3D LED Pyramid
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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Materials

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.

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PCB

Component list

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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