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.
Step 2: Order your parts!
As always, you can't build stuff without the correct parts. Here is my material list with example sellers for your convenience:
1x Arduino Uno (as programmer for Attiny85): http://amzn.to/1tZNXjZ
1x Attiny85: http://amzn.to/1qKReWK
1x Reed Switch: http://amzn.to/1oO2b5Q
1x Key Switch: http://amzn.to/1oO2jCh
1x IC Socket: http://amzn.to/1tZPcQ0
1x 12V Buzzer: http://amzn.to/1qKSkSx
1x BC547 NPN Transistor: http://amzn.to/1tZPWVq
4x 10kΩ, 1x 1kΩ, 1x 640Ω Resistor (1/4W): http://amzn.to/1A2KZzi
2x 10µF Capacitor: http://amzn.to/1tZRcrz
2x 0,1µF(100nF) Capacitor: http://amzn.to/PD2jZj
1x Push Button: http://amzn.to/1qKUxgG
1x LM7805 (5V linear regulator): http://amzn.to/1qKUGAC
1x PCB (striped) : http://amzn.to/1qKV2Hy
1x Male Headers: http://amzn.to/1qKVg1p
1x Female Headers: http://amzn.to/1tZTmHV
1x Red LED 5mm: http://amzn.to/1qKVuWm
Step 3: Build the circuit and connect the external parts!
Here you can find the schematic for the circuit. I also uploaded my layout for the stripped PCB. If you build it exactly according to my layout then the chances are higher that everything will work in the end.
And don't forget to make interruptions in the copper traces! Those are the yellow dots in the second layout.
If you managed to finish the circuit then go ahead and connect the external parts like the reed switch or the key switch to the main PCB. Use my picture of the PCB as a reference.
Step 4: Upload the code to the Attiny85
Here you can download my code. Feel free to change it if you are not pleased with the functions. I used an Arduino Uno as a programmer. Check out my other videos to see how this works.
Step 5: Success!
You did it. Now you can protect your belongings a little better and feel safer.Feel free to check out my Youtube channel for more awesome projects:
You can also follow me on Facebook, Twitter and Google+ for news about upcoming projects and behind the scenes information.