"Most alkaline batteries available are disposable, designed to be used until exhausted, then discarded." (source Wikipedia). That's probably true. The most of us just throw these batteries to the disposal bin because we believe they are not rechargeable. We believe…
Math can be sweet
I come to you with a simple problem which hopefully any of you can solve it. Although the final solution is what certifies that the problem has been solved correctly I am more interested to see the approach that each…
5W solar battery charger for 5 bucks
A while ago I bought 40pcs poly-crystaline solar cells (5 x 2 cm2) with the hope that I will find some spare time to build a small 5W solar battery charger. Each cell provides an average of 0.28A @ 0.5V…
Fake alarm system to trick burglars
I have an apartment in a building where all the tenants have their storage room in the basement. I use it to store various old things there, just like anyone else. These days someone has cut one of those two…
Dropbox OAuth authentication
In the last three days I worked to create a WordPress plugin that simply creates a multi-volume compressed backup for a specified directory (eg. entire website) and then uploads it on my Dropbox repository. Maybe I will write an article…
Undelete files on Linux
To continue my series of "Oops i did it again" I would like to explain few methods that allows you to undelete files on Linux. One of the fastest and easiest method I found so far is with the help…