Home › Magazines › 2009 › July/August › Daylight Switch

Daylight Switch

Published in issue 391, July/August 2009

This project was originally designed for lighting up an illuminated sign for a wine-grower. The sign was originally controlled by a simple time-switch, which had to be reprogrammed every day to avoid the sign's lighting up while it was still daylight. This is time-consuming, and can lead to wastage of electricity and other resources. A better solution would be an automatic switch capable of detecting the transition between daylight and night-time.

Components

Relevant products

Resistors
R1 = 47Ohm 1W
R2 = 470kOhm
R3 = LDR
R4, R5 = 100kOhm
R6 =1kOhm
P1 = 1MOhm multiturn preset, vertical
Capacitors
C1 = 1µF5 400V MKT
C2 = 1000µF 25V axial
C3 = 100nF LCC 63V
C4 = 10µF 25V radial
Semiconductors
D1–D4, 6 = 1N4007
D5 = 15V 1.3W zener diode
T1 = BC547 or equivalent
IC1 = µA741 or equivalent
IC2 = 7812, or low-drop equivalent
Miscellaneous
RE1 = relay, 12V coil, 1x 10A, 250V c/o contact
K1,K2,K3 = 2-way PCB terminal block, 5mm (0.2") lead pitch
Type IP55 electricity junction box, internal dimensions 80 x 80 mm (3.15" x 3.15") e.g. plexo LEGRAND # 922-06
20 mm length of electricity conduit, diam. 20 mm (0.8")

Click below to download a PDF copy of this article from Elektor magazine.

	Downloads
	Article PDF
	10 Elektor Credits
	PCB PDF
	Free download
	Order this magazine
	Magazine July/August 2009
	UK391 (US $ 11.30)
	Order from ThePCBShop
	PCB, bare

Please note. In view of the complexity of international markets, Elektor cannot guarantee the availability of components for this project.

Subscribe now

Browse online

Subscribe to our free
E-weekly Newsletter!

Enter your Email address:

Front Panel Express

Design your unique front panel with our free CAD software - it is quick and easy! Front Panel Express will machine your design with modern CNC technology. You will receive the panel exactly as you need it in a couple of days.
Instant download

FAQ

Before submitting questions, review our FAQ section!

Spotlight

Elektor 1990 through 1999

This DVD-ROM contains the full range of 1990-1999 volumes (110 issues, more than 2,100 articles) of Elektor Electronics magazine.

Search

Subject Area

Articles

Products

My Elektor

Home › Magazines › 2009 › July/August › Daylight Switch

Daylight Switch

Subscribe now

Subscribe to our free
E-weekly Newsletter!

Front Panel Express

FAQ

Spotlight

Search

Subject Area

Articles

Products

My Elektor

Home › Magazines › 2009 › July/August › Daylight Switch

Daylight Switch

Subscribe now

Subscribe to our freeE-weekly Newsletter!

Front Panel Express

FAQ

Spotlight

Subscribe to our free
E-weekly Newsletter!