Staff View: Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim

Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim

For the final project we decided to continue our planned to build the 'light operated switch'. Light operated switches not new ideas, but neither are they the easiest items to purchase ready-made. Originally, this unit built to switch, on the outside Christmas lights when it became dark. I...

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Main Authors:	Abdullah, Alyzah, Abd Horim, Nur Aniza
Format:	Student Project
Language:	English
Published:	2002
Subjects:	TH Building construction Illumination. Lighting TK Electrical engineering. Electronics. Nuclear engineering Electronics Detectors. Sensors. Sensor networks Applications of electronics Photoelectronic devices (General)
Online Access:	https://ir.uitm.edu.my/id/eprint/50802/1/50802.PDF https://ir.uitm.edu.my/id/eprint/50802/
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id	my.uitm.ir.50802
record_format	eprints
spelling	my.uitm.ir.508022021-09-28T03:01:13Z https://ir.uitm.edu.my/id/eprint/50802/ Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim Abdullah, Alyzah Abd Horim, Nur Aniza TH Building construction Illumination. Lighting TK Electrical engineering. Electronics. Nuclear engineering Electronics Detectors. Sensors. Sensor networks Applications of electronics Photoelectronic devices (General) For the final project we decided to continue our planned to build the 'light operated switch'. Light operated switches not new ideas, but neither are they the easiest items to purchase ready-made. Originally, this unit built to switch, on the outside Christmas lights when it became dark. It will have other uses in mind. One such might be as a security porch light controller. The light level required for the unit to switch on or off is fixed, but since this is set by a single resistor value can easily be altered. A degree of hysteresis is included to reduce the chance of the unit being affected by the light it controlling. Reasonably careful siting though, will still be necessary to prevent the controlled light from directly illuminating the sensor. The purpose for this project is to identify that when the LDR is in the dark, it will directly connect to the main circuit so it will switch on the lamp and when it is not in the dark side the circuit will switch off the light. When the LDR is in the dark, the internal resistor in LDR decreases as low as 100Q; the light will light up. But when the LDR is not in the dark, the resistance will exceed to 10MQ; the light in the switch off condition. In this project, we used ‘4093 CMOS Quad NAND Gate’ it is the Schmitt trigger IC with two input and combined in a NAND configuration. The PCB is designed to fit behind a single electrical blanking plate, with a hole to allow light to reach the photocell. This plate can be fitted to a single 25 mm surface box, giving a cheap and tidy wall mounting case. For original purpose, the unit was placed on a window; with the photocell facing outwards. 2002-09-11 Student Project NonPeerReviewed text en https://ir.uitm.edu.my/id/eprint/50802/1/50802.PDF ID50802 Abdullah, Alyzah and Abd Horim, Nur Aniza (2002) Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim. [Student Project] (Unpublished)
institution	Universiti Teknologi Mara
building	Tun Abdul Razak Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Teknologi Mara
content_source	UiTM Institutional Repository
url_provider	http://ir.uitm.edu.my/
language	English
topic	TH Building construction Illumination. Lighting TK Electrical engineering. Electronics. Nuclear engineering Electronics Detectors. Sensors. Sensor networks Applications of electronics Photoelectronic devices (General)
spellingShingle	TH Building construction Illumination. Lighting TK Electrical engineering. Electronics. Nuclear engineering Electronics Detectors. Sensors. Sensor networks Applications of electronics Photoelectronic devices (General) Abdullah, Alyzah Abd Horim, Nur Aniza Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim
description	For the final project we decided to continue our planned to build the 'light operated switch'. Light operated switches not new ideas, but neither are they the easiest items to purchase ready-made. Originally, this unit built to switch, on the outside Christmas lights when it became dark. It will have other uses in mind. One such might be as a security porch light controller. The light level required for the unit to switch on or off is fixed, but since this is set by a single resistor value can easily be altered. A degree of hysteresis is included to reduce the chance of the unit being affected by the light it controlling. Reasonably careful siting though, will still be necessary to prevent the controlled light from directly illuminating the sensor. The purpose for this project is to identify that when the LDR is in the dark, it will directly connect to the main circuit so it will switch on the lamp and when it is not in the dark side the circuit will switch off the light. When the LDR is in the dark, the internal resistor in LDR decreases as low as 100Q; the light will light up. But when the LDR is not in the dark, the resistance will exceed to 10MQ; the light in the switch off condition. In this project, we used ‘4093 CMOS Quad NAND Gate’ it is the Schmitt trigger IC with two input and combined in a NAND configuration. The PCB is designed to fit behind a single electrical blanking plate, with a hole to allow light to reach the photocell. This plate can be fitted to a single 25 mm surface box, giving a cheap and tidy wall mounting case. For original purpose, the unit was placed on a window; with the photocell facing outwards.
format	Student Project
author	Abdullah, Alyzah Abd Horim, Nur Aniza
author_facet	Abdullah, Alyzah Abd Horim, Nur Aniza
author_sort	Abdullah, Alyzah
title	Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim
title_short	Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim
title_full	Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim
title_fullStr	Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim
title_full_unstemmed	Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim
title_sort	light operated switch / alyzah abdullah and nur aniza abd horim
publishDate	2002
url	https://ir.uitm.edu.my/id/eprint/50802/1/50802.PDF https://ir.uitm.edu.my/id/eprint/50802/
_version_	1712288419614294016
score	13.211869

Light operated switch / Alyzah Abdullah and Nur Aniza Abd Horim

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