Browsing by Author "Thevathayarajh, T."

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    Development of a monitoring device for fermentation stage of black tea manufacturing
    (Uva Wellassa University of Sri Lanka, 2018) Thevathayarajh, T.; Wanniarachchi, D.D.C
    Tea is one of the popular industries around the world for its social influence. Taste, tea colour and odor are the ways to measure the quality on the final product, but Theaflavins/Thearubigins ratio is accepted as 1/10 for a high quality. In general factory officers estimate the optimum fermentation time visually. However, optimum fermentation time might depend on humidity, temperature, moisture content of leaves, which are processing on a particular day. Thus, there is a need for a system independent from human decision. An electronic device was developed, in order to determine the optimum fermentation time for the black tea. A set of sensors such as humidity, moisture and temperature were attached to the device to store the physical environment data of the fermentation bed. Colour changes during the fermentation were monitored using an iPhone 6s camera, which have 12 mega pixels. First set of tea particles from a batch of fermentation was selected for the research. This device was allowed to collect data until the factory officer asked to stop the fermentation according to his own decision. A sample of each monitored batch was collected after firing to measure percentage of Theaflavins. Tea infusion was monitored using Ultraviolet spectrophotometer. Finally, data were analyzed statistically. Theaflavins content decreases with the fermentation time which is the trend expected. The average temperature, temperature difference and average room temperature are statistically significant with fermentation time at 0.05 level of significance and percentage of variance is 96.6. Moisture content is constant because this is expected as we focused on dry season leaves. Finally, study confirms the importance of measuring physical parameters when monitoring fermentation stage to obtain quality tea. Some advanced test has to be done on the fermentation tea colour in future. Keywords: Black Tea, Optimum fermentation time, Theaflavins, Tea quality, Electronic eye
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    Development of Tracking over Speed System Using IoT Technology for Vehicles
    (Uva Wellassa University of Sri Lanka, 2021) Danijal, T.J.; Thevathayarajh, T.
    Now, IoT technology is used for many applications. But they are certainly used for agriculture purpose in Sri Lanka. In the modern era, many accidents occur due to over speed. But accidents are controlled with the help of the police force and speed bumps in the past. IoT technology was used in this project to monitor the high speed. First, the velocity of the motorcycle was measured with the help of a Tachometer. When approaching the predefined maximum speed, the warning message was sent to the driver. When crossing the predefined maximum speed, all details including the reading of the Tachometer and location were sent to the mobile number of the motorcyclist and to the web application that was created for the police force at the same time using GPS/GPRS/GSM module. Finally, the output of the complete project shows 90% accuracy and the system showed the expected output with the available components. Keywords: IoT technology; over speed; Tachometer; Gps module; GPRS module; GSM module
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    A Digital Device to Measure Distance on Multiple Surfaces
    (Uva Wellassa University of Sri Lanka, 2019) Thevathayarajh, T.; Amarasinghe, A.R.P.C.C.J.; Ekanayake, R.M.T.C.B.
    Measurements are one of the daily procedures to separate the needed length in apparel industries. Measuring tape is the only available method for this process now a days. Even shoulder measurements in tailor shop is taken by measuring tape too. This might consumes time and causes error while taking measurements quickly. So there is a need for the independent measuring system to solve this deficiency. A pen like structure of diameter 3.5cm cylindrical wooden bar was cut and further diameter of 2cm was drilled in that where the components were set. A Keyes KY-040, rotary encoder was used to count the rotation was attached to the end of the cylinder. Smooth surface and rough surface shaped disc were made using 3D printers and those models were designed using SolidWorks software. These discs can be attached to the encoder shaft according to the surface where the device is used. Arduino Nano was used as microcontroller for performing algorithmic work. Liquid crystal display was used to display the output measurement. This measurement can be displayed in Centimeter, Foot and Inch scales at the press of a button. Error corrections were done according to the measurements obtained from the Measuring device. 96% percentage accuracy was obtained on the random measurements