Article

TV Surround Light

The digital approach

A while ago the author saw a demonstration of a Philips television system equipped with the Ambilight system. This lights up the background with colours that are dynamically matched to the image content. The author thought it would be an excellent idea to create a similar DIY system for mood lighting. No sooner said than done, as can be seen from the TV Light project described here – a system that is very similar to the now legendary Ambilight system.

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Materials

070487-PCB.pdf

070487-11.zip

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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The use of our Gerber files is provided under a modified Creative Commons license. Creative Commons offers authors, scientists, educators and other creatives the freedom to handle their copyright in a more free way without losing their ownership.

PCB

Download Gerber file: 070487-1.zip

Extra info / Update

In the parts list in the printed magazine, the designations IC3 and IC4 should be interchanged. This does not affect the PCB or the circuit diagram.

All passive SMD parts are rectangular shape, footprint SMD1206.

Of the ADC1175JM and ADC1175TC mentioned in the article, only the –JM version is a discontinued part. The PCB has been designed to accept both versions.

LED light bars are available from, among others, www.reichelt.de (e.g. # LED 13,5RGB 3W).

Contrary to what is stated in the article text on page 28, ready-built boards are not available through the Elektor Shop.

Update: 15 May 2008

New firmware uploaded. Added bootloader.

Component list

Resistors
R1,R5-R20,R22-R29,R40,R42-R47,R54,R59,R63,R68,R72,R77 = 100Ω
R2,R3 = 22Ω
R4,R21,R30,R39, = 4kΩ7
R31-R38,R41 = 180Ω
R48 = 680Ω
R49,R52,R61,R70 = 75Ω
R50 = 620Ω
R51 = 680kΩ
R53,R62,R71 = 3kΩ6
R55,R64,R73 = 120Ω
R56,R65,R74 = 10kΩ
R57,R66,R75 = 8kΩ2
R58,R67,R76 = 220Ω
R60,R69,R78 = 47Ω
Capacitors
C3 = 470nF
C4,C5,C7,C8,C10-C14,C21,C22,C23,C30,C31,C32 = 100nF
C9 = 560pF
C1,C20,C29 = 100pF
C2,C15-C19,C24-C28,C33-C36 = 10μF 25V
C6 = 220μF 25V
Semiconductors
D1-D4 = LL4148
D5 = LL4007 (SOD-106)
D6 = LED, 5mm, red
T3,T6,T9 = BC857
T1,T2,T4,T5,T7,T8 = BC847
IC1 = PIC18F4550-I/P, programmed, Elektor Shop # 070487-41
IC2 = PIC16F628-20I/P, programmed, Elektor Shop # 070487-42
IC4 = ICS502 (SO8)
IC3 = 7805T
IC5 = 74AC00N (DIP14)
IC6 = LM1881 (DIP8)
IC7,IC8,IC9 = ADC1175
IC10-IC18 = CNY17-1
X1 = 20 MHz
Miscellaneous
S1,S2,S3 = 2-way SIL pinheader (pushbutton)
S4 = 4-way DIP switch
S5 = single-pole on/off switch (Farnell # 9575502)
K1 = DC supply socket, PCB mount
K2 = SCART socket
K3 = VGA socket
JP1,JP2 = 2-way SIL pinheader with jumper
K4,K5 = 5-way SIL pinheader
K6 = USB-B socket
K7 = connector (optional)
K8,K9,K10 = 5-way DIN socket
PTC = Current protection (PTC660 or wire link)
Enclosure, e.g. Vero # 16-3638089
PCB # 070487-1, see Elektor Shop section or www.elektor.com
Project software; PIC source and hex files in archive # 070487-11.zip, free download from www.elektor.com