An accurate and efficient solar tracking system using image processing and LDR sensor
The use of renewable energy resources is increasing for the purpose of producing electricity in modern world due to lack of non-renewable sources. As solar panels are becoming more popular day by day, it is a crying need to maximize the solar panel efficiency. The efficiency of solar panels can be increased to a great extent if the solar panels continuously rotate in the direction of sun. Microcontroller and an arrangement of LDR sensors can be used for the purpose of tracking the sun. But the system is less efficient because of the low sensitivity and disturbance of light dependent resistors. In this paper, a methodology of an automatic solar tracker is proposed by means of both sensors and image processing simultaneously. The mechanism of solar tracking was implemented by the use of an image processing software which combines the effect of sensors and processed image of sun and controls the solar panel accordingly. The methodology is a combination of hardware and software which can be used to control hundreds of solar panels in a solar power plant with more accuracy. It can be concluded that the proposed system is more accurate and efficient than the conventional solar tracking systems which can optimize the power requirement.
Adaptive Algorithm Based Sensor-less Dual-Axis Solar Tracking System
The angle of incidence of light significantly influences the energy harvested by a solar panel. A dual-axis altazimuth mount enables the solar panel to track the Sun when it is in the panel’s field of view to make light fall normal to the panel’s face. An adaptive algorithm based sensor-less dual-axis solar tracking system is proposed which enables the panel to track the brightest object in its range using the power output as a guide which helps to track the true source as it eliminates the mismatches between an additional sensor and the actual panel output. A frugal prototype of the proposed system is implemented and used to collect data that indicates the advantages of the solar tracking system. The average energy harvested per day by the system is found to be 75Wh in tracking mode and 56Wh in static mode of operation that shows a 34% improvement in the yield of the solar panel.
English Code-Mixing and Code-Switching in Thai Songs
This study aims to investigate the attitudes of Thai people toward English code-mixing and code-switching in Thai songs and to find out if English code-mixing and code-switching in Thai songs could be an effective pedagogical instrument for learning the English language. The researcher selected a target population of 50 Thai participants (25 adolescent and 25 middle aged participants) and, by using a questionnaire, surveyed their attitudes towards the mixing and switching of English vocabulary in Thai songs. In addition to the questionnaire, two from the 50 participants were interviewed. One was an adolescent who has a very good knowledge of English and the other was a middle aged participant with almost no knowledge of English. The findings show that a majority of the middle aged participants disagree on the positive attitudes and reasons of people who listen to Thai songs which mix and switch the English language while a majority of the adolescent participants believe that some people who listen to Thai songs which mix and switch the English language are knowledgeable as well as show good taste and have a high social status. On the other hand, both the adolescent and middle aged group agree that some Thai songs which mix and switch the English language sound annoying and are inconsistent in conveying the meaning of the lyrics. Both groups also agree that Thai songs which mix and switch the English language may help listeners to enhance their knowledge of the English language. When interviewed individually, the participant who is very good in the English language tended to emphasize only the English competency of the listeners; while the participant who does not have any knowledge of the English language tended to emphasize the listeners‟ liking of the lyrics, the meaning and the melody of the songs. However, the use, as a pedagogical instrument, of Thai songs which mix and switch the English language could open up an additional choice for language learners in English vocabulary learning. Such songs would be acceptable as an effective pedagogical instrument for learning the English language if the English words in the songs also show correct English syntax.