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RGB LED Mood Lighting

Ambience courtesy of an MSP430

RGB LED Mood Lighting
High-brightness LEDs are being used more and more widely in lighting applications. Here we present a simple ‘mood light’ using just a few components. Each of three LEDs is provided with a constant current using a switching regulator, and brightness control is performed by an MSP430 microcontroller generating three PWM signals. The printed circuit board could be fitted inside a table lamp with a frosted glass envelope or could be used with an LED spotlight for indirect lighting.
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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.

(SMD 0603 unless otherwise stated)
R2 = 330Ω
R3,R4,R6 = 100kΩ
R5 = 47kΩ
R11,R13,R21,R23,R31,R33 = 10kΩ
R12,R22,R32 = 2Ω (SMD 1206)
C1,C11,C13,C21,C23,C31,C33 = 4µF7 6.3V; X5R, (SMD 0603)
C2 = 100nF (SMD 0603)
C3 = 10nF (SMD 0603)
C4,C12,C22,C32 = 22μF (SMD1210)
D1 = BZX84-C3V3 (SMD SOT23)
D13,D23,D33 = TS4148 RY (SMD 0805)
D14 = 1W LED, Golden Dragon, red (Osram)*
D23 = 1W LED, Golden Dragon, green (Osram)*
D33 = = 1W LED, Golden Dragon, blue (Osram)*
U1 = MSP430F2131RGB (TI)
U11,U21,U31 = TPS62260DRV SMD SON-6 (TI)
L11,L21,L31 = 2μH2, 1.1 A, 110 mΩ, SMD 2x2.5 mm (MIPSA2520D2R2, FDK)
R1 = rotary encoder, Bourns 3315-001
JP1 = 14-way boxheader
JP2 = 6-way connector (Samtec TMS-106-XX-X-S-RA)
TP11,TP12,TP13,TP21,TP22,TP23,TP31,TP32,TP33 = test pin, e.g. Keystone 5001
Heatsink, Fischer SK 477 100
Heat conducting self-adhesive tape, Fischer WLFT 404 R25
PCB, order code 070892-2**
*LED alternatives:
Lumiled REBEL LED using PCB 070892-1

Osram Golden Dragon LED using PCB 070892-2
CREE XLAMP LED using PCB 070892-3

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