Fabrication of Low Cost Automated Lime Colour Sorter

Abstract Among fruit crops lime has high demand in the world. There are varieties of products being made from limes at various stage of maturity. Colour is the vital parameter of maturity indication of most agricultural produces. Colour of lime produce varies from green to yellow. Although yellowish limes are preferred by some category of people and processers, for exporting purposes greenish limes are being used because of their longest shelf time. Thus, sorting based on its colour is crucial for consumer acceptability and also for further processing. Both greenish and yellowish limes are harvested together and sorted through post-harvest operation of colour sorting. This is often performed by manual labourers. The main limitation associated with hand sorting is less accuracy, as human evaluation may vary person to person. Therefore, automated grading system is becoming popular due to its superior speed, consistency, and accuracy. This paper discusses about a new approach to develop a lime colour sorter at a minimum price using TCS230 colour sensor. The identification of the colour is based on the frequency analysis of the output of TCS230 sensor. Arduino Uno was used to control overall process. Stepper motor was used to sort limes into two different classes. All the mechanical parts were designed through Auto CAD software. Fabricated sorter was tested at various environmental light intensities, the results shown there is no influences by the sexternal light.

Keywords Arduino Uno, Auto CAD, Colour sorting, Stepper motor, TCS230 colour sensor.

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Agriculture Journal: Fabrication of Low Cost Automated Lime Colour Sorter

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