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Ambience Lighting Controller

Setting the mood with RGB LEDs

Ambience Lighting Controller
Color LED strips are now available at low cost in all sorts of types and sizes. With the controller circuit described here, you can set your own colors and even configure and run complete lighting programs. The controller is battery powered, so it can be used in places where AC power is not readily available.
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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 = 47Ohm 0.5W
R2 = 1Ohm 5W
R3,R5,R6,R8-R14,R16-R19 = 10kOhm
R4,R7 = 3.9kOhm
R15,R20,R21 = 1kOhm
R22 = 47Ohm
P1 = 10kOhm preset, horizontal
Capacitors
C1 = 470µF 16V radial
C2,C3,C10 = 100nF
C4 = 100µF 16V radial
C5,C6 = 15pF
C7 = 470nF
C8,C9 = 1µF 16V radial
Semiconductors
D1,D2 = 1N5400
D3,D4,D6 = 1N4148
T1,T2 = BC547B
T3,T4,T5 = IRL540 (International Rectifier, Newark/Farnell # 8651078)
IC1 = LM7805
IC2 = PIC16F887, programmed, Elektor # 110406-41)
D5 = LED, red, 3mm
Miscellaneous
X1 = 20 MHz quartz crystal
F1 = fuse, 2AT (slow), with PCB mount holder
F2 = fuse, 3.15AT (slow) with PCB mount holder
BZ1 = active (DC) buzzer (with internal oscillator)
RE1 = relay, 12V, 1 c/o contact @ 2A min. (e.g. Finder 40.31.7.012.0000; Newark/Farnell # 1169158)
MOD1 = Elektor USB-FT232R breakout-board (BOB) [1]
S1,S2 = slide switch, angled pins, PCB mount (e.g. C&K OS102011MA1QN1; Newark/Farnell# 1201431)
S3,S4,S5 = rotary encoder with integrated pushbutton (e.g. Alps EC12E2424407; Newark/Farnell # 1520813)
K1,K7 = 2-pin PCB screw terminal block, 5mm lead pitch
K2,K3,K4,K5 = 4-pin pinheader, 0.1'' pitch
K6 = 5-pin pinheader, 0.1'' pitch
LCD1 = LCD 2x16 characters, with backlighting (e.g. Elektor # 120061-71))
J1,J2 = 3-pin pinheader with jumper, 0.1'' pitch
40-pin DIL-socket for IC2
PCB 110406-1 [2]
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