Browsing by Author "Perera, M.D.R."

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Smart electricity monitoring and analysing an IoT system with a mobile application
(Department of Industrial Management, Faculty of Science, University of Kelaniya, Sri Lanka, 2020) Fernando, A.I.R .; Perera, M.D.R.
Now, the demand for electricity has increased in the World. This demand was increased concern to the raises of many developed and developing nations in the world. In Sri Lanka, the energy was provided by only less electricity power stations. So, the scarcity of electricity has occurred eventually. Thus, reducing and controlling power consumption will be responsible for all consumers. Furthermore, consuming data should be tracked by the consumer is essential now. But recently, consumers are using traditional meters in each home. It has failed to provide these facilities to the user. Moreover, Digital meter is trying to reduce these limitations. This research study focuses on a Smart Electricity Monitoring System using a mobile application. This is an IoT based project. The electricity consumption can be observed by the user through a userfriendly mobile app. And also, the monthly electricity bill has automated. This smart electricity meter system can be separated into three divisions, and the first system is the hardware setup using Arduino to measure electricity consumption at home. The real-time Alternate current and Alternate voltage through the hardware setup were measured through this system. By considering these values, the Alternate power will be generated. Then the real-time values were converted to units(kW/h) and sent to the database through Wi-Fi. The real-time database in Firebase was the other system. Storing real-time data and permitting them to retrieve them through the mobile application was the main function here. The final system is the user-friendly android application. This system aims to get more involvement of the consumer to their electricity consumption and reduce global electricity consumption. As the results can be observed through the mobile application, the user can get some idea of saving and reducing electricity than earlier.
Virtual Airplay Drum Kit based on Hand Gesture Recognition
(3rd International Conference on Advances in Computing and Technology (ICACT ‒ 2018), Faculty of Computing and Technology, University of Kelaniya, Sri Lanka., 2018) Dias, D.S.; Perera, M.D.R.
In the music industry, a drum kit plays a vital role in the production of masterpiece musical melodies. It is also one of the instruments that is in greatest demand by youngsters who are passionate in learning and practicing music. But acquiring a typical drum kit is become a difficult task because of its high cost as well as it requires a large storage space to hold. This research is targeted in examining the possibility of engineering a cost-effective solution to build a portable drum kit. In this approach, ultrasonic sensors are used in order to identify hand gestures. Ultrasonic sensor is used to measure the distance to an obstacle using the theories of sound reflectance. The obstacle in this scenario is the human palm. When the palm of the human is moved up and down above the ultrasonic sensor, mimicking the typical actions of playing a drum kit, the changes in distances to the palm are mapped to corresponding drum sounds using a sound generation algorithm. This algorithm is further optimized in such a way that it yields an optimal consistency in readings, regardless of the typical issues of the low cost ultrasonic sensor such as noise, low accuracy of distance readings and random loss of signal. The solution was tested with the feedback of the general audience and it yielded satisfactory results, in achieving our goal. In conclusion, this approach could be well used in reaching our goal based on over 75% of positive feedback (rated very good and good) received. But in order to improve its accuracy and efficiency, more expensive and more accurate distance sensors such as high precision ultrasonic sensors or infrared sensors could be used. The portability, the low cost of engineering, and yet the deliverance of acceptable level of quality of music, could be identified as the unique key point of this research.