Update: Easy Timer 1.2

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Posted by Stigern | Posted on 16-02-2011

Category : Windows

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A simple yet powerfull timer application for windows.

It’s a simple timer application, with alarm sound when the time runs out. Can be minimized to tray, and pops up when times over. Can even start programs, soundfiles and shutdown the computer when it runs out.

Customize it to your use!

Features, new ones are in bold:

* Shutdown, powers off the computer when the timer runs out.
 * Popup Message, show a message when the timer runs out.
 * Added hours to the timer, now you can add up to 23 hours.
* No pop up from tray, stays hidden even after time runs out.
* Mute, alarm makes no sound. Nice for starting apps.
* Close after alarm is over, also nice when starting apps or such.
* No installation at all, just unzip and use. Portable and small.

Download Easy Timer 1.2!

How to make a security alarm using LDR and Laser!

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Posted by Stigern | Posted on 05-09-2010

Category : Arduino, Electronics

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How about a easy and simple tutorial on how to make a sort of security sensor using laser and a light dependent resistor?

It’s just as simple as this, the LDR reacts when it gets less light than the laser-dot in the center of it. Which is when something comes in the lasers way. So then you know when something passes the invisible line between the laser and the LDR.

Lets begin with what components you need:

1x Laser Emitter/Pen
1x LDR
1x Resistor 10k (doesn’t have to be 10k ohms)
1x Piezo Buzzer (you can use a LED or anything else you want)

And of course a Arduino board of your choice, and some wires.

Lets wire it all up like this:

Things to notice, buzzer is grounded and the + wire is on the digital 10. Laser is just ground and +5v to make it light constantly. The LDR is in a voltage divider with a resistor, we take out the readings in the middle where the yellow wire is, and it’s attached to the analog 0.

A picture of the LDR.¨

When all this is wired up, just put this code and run it.

[youtube=http://www.youtube.com/watch?v=IzEDspdWjxU;ap=%2526fmt%3D18&w=425&h=344]