In this project I will show you how to build a very simple security system for all kinds of rooms. It might be simple but still effective. It is based around an Attiny85 and uses a reed switch and a key switch as inputs to see whether an intruder has accessed the room. A buzzer will then notify you or other persons. Let's build it

Step 1: Watch the video!

The video gives you all information to build this simple security system. But I will cover the most important steps again.

<p>Hi</p><p>This project is what i need, in our building we get a lot of breakings in the past year at basement.</p><p>I'm a newbie at electronics, the problem i have is that the power in the basement is 24V, i have a lot of transformer of 9v &amp; 4.5v from 220v ...</p><p>Can someone advise me on a good and cheap method of using 24v and not 220v ?</p>
<p>You can use a simple and cheap step down converter.</p><p>If you set the voltage to exactly 5 volts, you can go without the 7805 voltage regulator and capasitors</p>
<p>Now no one will ever sneak up on me again!! XD</p>
<p>I used to install burglar alarms, and my first reaction to this was &quot;This doesn't need a microcontroller, just a couple of relays.&quot; Then I realized that the Attiny costs less than one of the relays.</p>
you wrote simple but i say wonderful project..creative idea..nicely done..

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Bio: Awesome Electronics Tutorials, Projects and How To´s
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