About the article

The LEDBUS System

Programmable control for LED lighting

The LEDBUS System
The circuit described here, called ‘LEDBUS’ allows a practically unlimited number of LEDs to be controlled and up to ten lighting programs can be configured, which can be called up at the press of a button using a standard infrared remote control. Each lighting program specifies the desired brightness of each LED module individually.
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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.

Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Component list

Power module 070459-1
R1 = 0Ω33 1 W (SMD 2515)
R2,R3 = 220Ω (SMD 0805)
R4 = 10kΩ (SMD 0805)
C1,C2 = 100nF (SMD 0805)
C3 = 2µF2 (SMD1210; dielectric X7R or X5R)
D1 = 10BQ100 (Schottky)
D2,D3 = SMD LED (SMD 1206)
T1 = BC850
IC1 = µA78L05ACD
IC3 = PIC12F638-I/SN, programmed, Elektor Shop # 070459-41
L1 = 68µH SMD inductor, 10x10; e.g. Epcos B82464G4683M
K1 = 4-way PCB terminal block, lead pitch 5mm
K2 = 6-way SIL pinheader
K3,K5 = 6-way mini-DIN socket, PCB mount
Up to 6 power LEDs; e.g. Luxeon 1W types (see text)
PCB, ref. 070459-1 from www.thepcbshop.com
Project software, free download from www.elektor.de

Central unit 070459-2
R1,R2 = 15kΩ
R3,R4,R6 = 4kΩ7
R5 = 33 Ω

R7-R10 = 1kΩ
R11-R14 = 10kΩ
P1 = 10kΩ preset
C1,C2,C4,C5,C6 = 100nF
C3 = 100µF 25V radial
C7,C8 = 22pF
D1 = 1N4001
D3, D4 = LED 3mm; low-current (D2 omitted)
D5 = LD271; IR-LED
T1 = BC337
IC1 = 7805
IC2 = ATmega32-16PC (SMD), programmed, Elektor Shop # 070459-42
S1-S4 = pusbbutton, 6x6 mm
X1 = 16MHz quartz crystal
K4,K6 = 10-way boxheader
K5 = 6-way mini-DIN socket, PCB mount
RC-5 receiver, e.g. SFH5110-36 (on K3)
LCD Module witn 2x20 characters; e.g. Displaytech 202A (on K2)
PCB, ref. 070459-2 from www.thepcbshop.com
Project software and Guide to Operation, free download from www.elektor.de

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