Beginner Laser or IR beam alarm system - Page 4 - Electronic Circuits Projects Diagrams Free

tyeo000 · 21st July 2006, 04:08 AM

sorry for the double
i cant get any of these to werk on my breasboard...
i guess its time for some new transistors...

ishank thandi · 8th August 2006, 09:10 AM

use power MOSFETthat the right way.

KingEmperor24 · 20th September 2006, 06:16 AM

Sorry to bring up an old post, but I am looking to create this system and in addition have it sound an alarm inside my house. For instance, whenever a car pulls up into the driveway an alarm tells me. I think that the easiest way would be to use a simple FM transmitter instead of a buzzer, though I'm not completely sure; I would be picking up the signal a a standard radio and excessive static could be annoying. Any suggestions and Schematics/other help?

I'm a noob to electronics past incredibly simple stuff.

Thanks.

Cool_buddy_57 · 29th September 2006, 12:27 PM

i think ur circuit is great but
here you cannot given the value of transistors(NPN,NPN,PNP)
plz given the value of these transistors in this circuit
i hope u understand my question

mohamed abdullah · 7th October 2006, 04:16 PM

hello hi,
am very new ere.... so please explain about this laser working principle...... i saw that circuit diagram....... just there is buzzer only.... but wer is laser light.... please help me...

mohamed abdullah · 7th October 2006, 04:21 PM

ello hi sir,
am very new ere..... and i saw your circuit diagram.... what is the purpose of that circuit connection....... please give details ...... where do we connect the laser?

mohamed abdullah · 7th October 2006, 04:27 PM

how can i connnect the laser beam and where? i'm very confused.....

Clark · 10th October 2006, 02:28 AM

Thanks, Im not familiar with transistors used in the circuit. can i use any transistor as long as it is NPN or PNP?

Cool_buddy_57 · 12th October 2006, 10:19 AM

Quote:

Originally Posted by mohamed abdullah

how can i connnect the laser beam and where? i'm very confused.....

There is no laser use in this circuit
in this circuit using LDR(light detected resistor)
when light fall on it then it resistance high and when light not fall then it,s zero resistance and this is work like Laser beam
i hope u understand

Cool_buddy_57 · 19th October 2006, 02:07 PM

Quote:

Originally Posted by zachtheterrible

This is a cool little circuit that i made for a school project. It can be used as one of those things that is usually seen on the door of small shops so that when someone walks in it goes "ding dong". It could also be used as a burglar alarm (just need to get a loud enuf siren).

A light has to be pointed at the LDR. It can be anything, just as long as its bright enough. Im pretty sure that an infrared LED would work, a regular light, or my personal favorite: a laser pointer, just like in the movies 8) . You could encircle your house w/ a laser so wen someone crosses the beam you know.

R1 can be adjusted for sensitivity of the circuit to light. The lower R1, the more sensitive, and vica versa. The value of R1 will not allow the circuit to work in direct or indirect sunlight. R1 would have to be increased to make the circuit less sensitive to light (even then i doubt it would work in direct sunlight). An alternative to this is putting a tube on the LDR that is a couple centimeters long so that only light from the light source could get in.

R4 can be adjusted for how long the buzzer stays on. 100k makes it stay on for about 9 seconds. Or the value of C1 could be adjusted.

Someday i plan on putting a transmitter on the circuit so that it could be put out in the yard, and a receiver inside would go off. HAVE FUN :lol:

In this Circuit you didnot give the value of NPN,NPN,PNP transistor. Plz show the value of these Transistors . Have a nice day
GOOG LUCK.

KingEmperor24 · 29th October 2006, 01:34 AM

Quote:

Originally Posted by KingEmperor24

Sorry to bring up an old post, but I am looking to create this system and in addition have it sound an alarm inside my house. For instance, whenever a car pulls up into the driveway an alarm tells me. I think that the easiest way would be to use a simple FM transmitter instead of a buzzer, though I'm not completely sure; I would be picking up the signal a a standard radio and excessive static could be annoying. Any suggestions and Schematics/other help?

I'm a noob to electronics past incredibly simple stuff.

Thanks.

*bump*

januar1983 · 23rd November 2006, 06:09 AM

do you know laser power supply

captnstoed · 24th November 2006, 04:04 PM

i tried a few of the links on this thread and the are dead, anyone know why?

**Nigel Goodwin** · 24th November 2006, 08:40 PM

Quote:

Originally Posted by captnstoed

i tried a few of the links on this thread and the are dead, anyone know why?

Probably because it's an old thread?.

OBY · 5th December 2006, 04:40 PM

Newbie here! Help, I apologize in advance if this is the wrong place to request help and Info reguarding Infrared LED Sensors. I'm trying to custom build a Wireless Sensor bar to replace the wired sensor bar that comes with the Nintendo Wii System. With a projector instead of a TV, the cable is not long enough and I have seen on other sites a homemade wireless IR LED Sensor bar utilizing 4 IR LEDs with 4 AA Batteries. I would like to utilize a AC adapter instead of batteries. Can anyone make a recommendation as to a wiring scheme I should follow with utilizing four of Radio Shacks #276-143 IR LED(1.2 volts ea). Do I need a resistor in line? I have several ac adapters left over from obsolete electronics, calculator chargers etc.. I have a DC 4 volt, or a 9 volt. Any recommendations & help would be appreciated and would help me make my family happier by not reaching or entangling themselves in any more wires than I already have. Thank you!

29th September 2006, 12:27 PM	(permalink)
Cool_buddy_57 New Member	Value of Transistors i think ur circuit is great but here you cannot given the value of transistors(NPN,NPN,PNP) plz given the value of these transistors in this circuit i hope u understand my question __________________ Cool Jasim

7th October 2006, 04:16 PM	(permalink)
mohamed abdullah New Member	i don't understand about this laser circuit and it's operation hello hi, am very new ere.... so please explain about this laser working principle...... i saw that circuit diagram....... just there is buzzer only.... but wer is laser light.... please help me...

7th October 2006, 04:21 PM	(permalink)
mohamed abdullah New Member	please clear my doubt ello hi sir, am very new ere..... and i saw your circuit diagram.... what is the purpose of that circuit connection....... please give details ...... where do we connect the laser?

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Thread	Thread Starter	Forum	Replies	Latest
Building IR BEAM Break alarm system	damenace	Electronic Projects Design/Ideas/Reviews	3	31st May 2008 08:44 PM
laser alarm system	ira thakur	Electronic Projects Design/Ideas/Reviews	8	9th January 2008 02:11 AM
laser beam-break detector	Darth Bagel	Electronic Projects Design/Ideas/Reviews	7	21st October 2007 04:18 AM
Laser Beam Tachometer With Pic	iftikhar ahmed	Micro Controllers	7	10th February 2007 01:38 PM
Beam alarm system	zachtheterrible	Electronic Projects Design/Ideas/Reviews	26	18th December 2004 09:26 PM

21st July 2006, 04:08 AM	(permalink)
tyeo000 New Member	sorry for the double i cant get any of these to werk on my breasboard... i guess its time for some new transistors...

8th August 2006, 09:10 AM	(permalink)
ishank thandi New Member	use power MOSFETthat the right way.

20th September 2006, 06:16 AM	(permalink)
KingEmperor24 New Member	Sorry to bring up an old post, but I am looking to create this system and in addition have it sound an alarm inside my house. For instance, whenever a car pulls up into the driveway an alarm tells me. I think that the easiest way would be to use a simple FM transmitter instead of a buzzer, though I'm not completely sure; I would be picking up the signal a a standard radio and excessive static could be annoying. Any suggestions and Schematics/other help? I'm a noob to electronics past incredibly simple stuff. Thanks.

7th October 2006, 04:27 PM	(permalink)
mohamed abdullah New Member	how can i connnect the laser beam and where? i'm very confused.....

10th October 2006, 02:28 AM	(permalink)
Clark New Member	Thanks, Im not familiar with transistors used in the circuit. can i use any transistor as long as it is NPN or PNP?

23rd November 2006, 06:09 AM	(permalink)
januar1983 New Member	do you know laser power supply

24th November 2006, 04:04 PM	(permalink)
captnstoed New Member	i tried a few of the links on this thread and the are dead, anyone know why?

5th December 2006, 04:40 PM	(permalink)
OBY New Member	Newbie here! Help, I apologize in advance if this is the wrong place to request help and Info reguarding Infrared LED Sensors. I'm trying to custom build a Wireless Sensor bar to replace the wired sensor bar that comes with the Nintendo Wii System. With a projector instead of a TV, the cable is not long enough and I have seen on other sites a homemade wireless IR LED Sensor bar utilizing 4 IR LEDs with 4 AA Batteries. I would like to utilize a AC adapter instead of batteries. Can anyone make a recommendation as to a wiring scheme I should follow with utilizing four of Radio Shacks #276-143 IR LED(1.2 volts ea). Do I need a resistor in line? I have several ac adapters left over from obsolete electronics, calculator chargers etc.. I have a DC 4 volt, or a 9 volt. Any recommendations & help would be appreciated and would help me make my family happier by not reaching or entangling themselves in any more wires than I already have. Thank you!