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Electronics => Electronics => Topic started by: yyy on October 17, 2009, 09:11:00 AM

Title: alarm - electronic project
Post by: yyy on October 17, 2009, 09:11:00 AM

I search after electronics project that explain exactly how to build an alarm

Title: Re: alarm - electronic project
Post by: Soeren on October 17, 2009, 11:03:03 AM

Hi,

You'll have to be a bit more precise!
An alarm is something that draw peoples attention to something, whether it's something that's too: Hot, cold, wet, dry, light, dark etc.

What condition do you need the alarm for?

Title: Re: alarm - electronic project
Post by: Pierre on October 17, 2009, 01:22:52 PM

Without knowing how experience you are, It might be easier if you start with the most simple alarm.

I use two simple one in my workshop.

     1.  Control Relay, Buzzer(electronic schime), switch magnet for house alarm; and

     2.  Similar but with resistors, diode and SCR.

Don't have a schematic but can easily draw it with explanations

Title: Re: alarm - electronic project
Post by: yyy on October 18, 2009, 03:16:41 PM

Alarm for burglar
The simple alarm is what I search
I search an electronic circuit of this and If it have a code I also want it

Title: Re: alarm - electronic project
Post by: SmAsH on October 19, 2009, 12:15:19 AM

More info plox.
What should set off this alarm? Just saying "burglar alarm" is a very vague term and could mean thousands of things.

Title: Re: alarm - electronic project
Post by: Soeren on October 19, 2009, 02:43:16 AM

Quote from: yyy on October 18, 2009, 03:16:41 PM

Alarm for burglar
The simple alarm is what I search
I search an electronic circuit of this and If it have a code I also want it

Here you go: http://tinyurl.com/yj4kynk (http://tinyurl.com/yj4kynk)

Title: Re: alarm - electronic project
Post by: Pierre on October 19, 2009, 05:41:37 PM

yyy:  As I promised, this one is easy.

     You only require:
          - Electric chime ( Radioshack);
          - 1KOhms resistors X2;
          - Control Relay;
          - Green and Red LED; and
          - Magnetic switch.

The schematic and picture should be worth a thousand words.  This is a start and get your imagination to make modification i.e. sensors, wireless.

I should say thank you.  I now got my two kids with a new toy to play with.   ;)

I get B minus with the schematic done by hand but did not find a good software yet.  


Soeren:   :D  Love that link.