Until recent, the humanity relied heavily on fossil fuels to produce the needed energy. At the beginning of the industrial revolution, coal was used to produce steam used to produce mechanical power. A hundred years ago the oil came into action. Up to this day, humanity relies on oil for many reasons. Another fossil fuel used is the natural gas. Up until this day, this one is used even to heat up many houses but also for water heating. Latest developments reveal the so-called climate-change.

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... eral years ago, polar caps melting have been noticed due to temperature rise. Scientists have also determined a rise of the CO 2 concentration. To limit the effects of the CO 2 increase, several countries have been agreed to reduce CO 2 emissions. One possible way to reduce them is to limit the use of the fossil fuels. Using the natural energy (produced by the sun) is a way to achieve this reduction. This paper presents a control system which can be used to rotate a solar panel (for hot water or electricity production) to increase the absorbed energy. A low-cost sensor is the central piece in this system. A microcontroller-based system is used to control the two motors to rotate the panel. System parts are described and conclusions are drawn.