Ever wanted to open a lock with a secret knock, [steve] shows us a video of one actully working. The idea is pretty simple, knock in a certain pattern and the door unlocks. We have seen many variations but this one is more easy in practice. The design is not bad, and it is easyly programable. To change the combination of the knock you just hold the red button, Simple!

We’re a bit surprised that the suction cups actually hold it on the door. Maybe it’s just us, but we can never seem to get those things to hold very well. There are lots of great pictures as well as the source code available on his site.

[via HacknMod]

A Picture showing Batery with a USB Port

You could buy a USB charger off the shelf, but what fun would that be? Try making one yourself with a little help from a 9V battery and a few extra components. This could be cheaper too.

This simple hack on a standard 9V battery is an easy one to undertake. It’s pretty straight forward, and all it requires is a quick solder to finish things up. It will give you power on the go and a sense of accomplishment for the day upon completing it. Hit up tech weblog anythingbutipod for the simple diagram to make your own.

This charger came usefull to me when my Ipod died out on a long road trip. I assured my self to carry a USB Charger so i charged my Ipod. It was like a externel disposable batery.

[anythingbutipod]