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LED Lighting For Model Buildings

Modular, PC controlled on a serial link

LED Lighting For Model Buildings
This small module has been designed to individually control five LEDs used to illuminate model buildings. The control signal is sent over a single wire from a PC’s RS232 serial port. The design allows for up to 250 modules to be controlled by a single PC, that’s almost enough for a small town!
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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.

COMPONENT LIST
Resistors
R1 = 100kOhm
R2–R6 = 1kOhm
R7 = 10kOhm
R8,R9 = 0Ohm
Capacitors
C1,C2 = 100nF
C3 = 100pF
C4 = 100µF 25V (e.g. Rubycon 25YXF100MEFC6.3X11)
Semiconductors
D1 = BAT85
T1 = BC548
IC1 = PIC12F675-I/P (Microchip), programmed, Elektor Store # 130136-41
IC2 = 78L05
Miscellaneous
JP1 = 6-pin pinheader
K1,K2,K3 = 3-pin PCB screw terminal block
PCB # 130136-1 [3]
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