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Lux Meter

Lux Meter
Conventional incandescent lamps have been phased out in many areas in the world, including the EU and Canada. What’s left is halogen lamps, energy-efficient lamps and LED lamps, which in fact have better efficiency than incandescent lamps. However, if you want to know how much better they are, you basically have to trust the manufacturer’s data. Although trust is good, measuring it yourself is better. The lux meter described here can help.
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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.

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The BOM (Bill of Materials) is the technically exhaustive listing of parts and other hardware items used to produce the working and tested prototype of any Elektor Labs project. The BOM file contains deeper information than the Component List published for the same project in Elektor Magazine. If required the BOM gets updated directly by our lab engineers. As a reader, you can download the list here.
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Component List
Default ratings: 1%, 0.1W, SMD0603
R1 = 200kOhm
R2 = 2kOhm
R3 = 3.9kOhm
R4,R5,R6,R8,R10,R13 = 10kOhm
R7 = 82kOhm
R9 = 33kOhm
R11 = 47kOhm 5%
R12 = 33Ohm 5%, 0.2W
R14,R15 = 220Ohm 5%, 0.2 W
P1 = 10kOhm 20% trimpot, SMD, Vishay TS53YJ103MR10
Default ratings: 10%, 10V, SMD0603
C1 = 1nF 5% 50V, C0G/NP0
C2 = 3.3µF 20V, SMD case A, tantalum
C3,C5 = 470nF
C4,C13 = 4.7µF 20V, SMD case A, tantalum
C6,C12 = 10µF, SMD Case A, tantalum
C7,C14 = 10nF 50V
C8,C9 = 22pF 50V, C0G/NP0
C10,C11 = 100nF 25V
L1 = 10µH 20%, 250mA, 1.05Ohm, SMD 0603
D1 = BPW21R, TO-5
D2 = TS4148 RY, SMD 0805
D3 = PMEG2010AEH, SMD SOD-123F
T2 = BC848B, SMD SOT-23
T3 = 2N7002, SMD SOT-23
IC1 = ATmega328P-AU, programmed, SMD TQFP 32A
IC2 = MCP3421A0T-E/CH, SMD SOT-23-6
IC3 = MCP6061T-E/OT, SMD SOT-23-5
IC4 = LP2951-50D, SMD SO-8
K1 = 6-pin (2x3) pinheader, 0.1’’ pitch
BT1,JP1,JP2,K2 = 2-pin pinheader, 0.1’’ pitch (K2 optional)
JP3 = 2-pin pinheader, 0.1’’ pitch, right angled
K3 = 5-pin pinheader, 0.1’’ pitch, right angled
JP1,JP2,JP3 = jumper, 0.1’’ pitch
S1 = pushbutton, 6x6 mm, vertical, make contact
BT1 = 9-V-battery clip with wires, optionally with receptacles for pinheader pins
RE1 = relay, bistabile, 2 contacts, coil 4.5V / 202.5Ohm, 1A/110VDC contacts (Panasonic AGN2104H)
X1 = 10.24MHz quartz crystal, 18pF, HC-49/4H
LCD1 = LCD module, 2x8 characters, backlit, 58x32 mm, TC0802B-01YA0 (Elektor Store # 120061-75)
PCB # 130109-1

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