Here is a way to revive your old battery pack. Usually the laptop battery is the first part to break. On older laptops a new battery pack can cost more than the PC itself, so buying a new one is no option.
Did you know you could build a speaker out of your old hard drive?
Well as a matter of fact, a harddrive uses the same technology for its arm as a traditional loudspeaker. Just apply the right waveform and it will produce sound.
This simple project uses a Dallas DS1820 one wire temperature sensor and a pic 16f628 microprocessor. A simple temperature regulator where a LED symbolizes the Fan.
This article will give you a few pointers about writing content on the web.Â
