Bachelor thesis subject, a waste water treatment system using solar power, the air conditioner degrees Sunday to reduce power consumption, Eli is intended to study the efficiency of solar cells for electricity to be able to adjust the angle in degrees Eli Sunday. The test system can control solar cells, adjust degrees Eli Sunday by using a microcontroller to control the LDR LDR 1 to 2 is a light when one of the drivers does not receive light, DC motor will rotate to a position that has the same light. From the trial. The maximum voltage is located at 20.21 volts maximum krasaeng measured was 3.14 ampere, and bring electricity to the wastewater treatment plant. By using the air compressor, oxygen-filled water to provide more quality products to measure the pH value of water is the best water 6-NN6D5 pH as possible.