Soft shell crab farming has been practiced in south-east IntroductionSoft-shell crab is a popular food in the United States, China, Japan, Hong Kong, South Korea, Taiwan, Malaysia and some countries in Europe. Crab commodity is a very promising business sector for the community in Asia, hence, farming of soft shell crab has been practiced in south-east Asian countries such as Indonesia, Thailand, Myanmar, Vietnam, and Philippines. Soft shell crabs are harvested when they have just molted to prevent their shells from being hardened. To growth the crabs, farmers need to feed the crabs with accurate portion of food. When feeding a dry food, farmers need to feed the crabs 5% food of their body weight [1]. However, farmers sometimes provide incorrect amounts of food to the crabs. Such exceeding feed results in food wastage and dirty water in the crabs' cage, hence, the crabs may be sick from drinking the dirty water. On the other hand, if farmers feed the crabs less than the required amounts of food, there will be slow growth and molting of the crabs. Therefore, we need an automation system to feed the crabs properly and accurately based on the required amount of food.The automation system is a technology that combines the use of mechanics, electronics, sensors and computer application to run a process with less human interference. Automation is basically used to help human beings do the routine, because human being has limitations in terms of precision, unlike machine/computer [2]. There are several studies on automated system for aquaculture and agriculture. References [3] and [4] developed an autonomous robot for agriculture. Reference [5] proposed a PI-based and fuzzy logic-based control system for measuring and controlling the light levels for the indoor hatcheries and nurseries in aquaculture. Reference [6] designed fish feeder system using PIC Microcontroller and it is operated by inputting the desired time the fish will be fed. Reference [7] developed a fish feeder using PIC microcontroller allowing the fish to be fed at the right cycle time as predefined by the user. Reference [8] developed an automatic feeding control for dense aquaculture fish tanks.In this study, we developed an automated feeding system for soft shell crab using microcontroller. This paper describes the hardware and software design of our proposed automated feeding system. Furthermore, we also evaluated the performance of our automated feeding system.

Pengembangan sistem otomatisasi bertujuan untuk pemberian pakan pada budidaya kepiting cangkang lunak yang saat ini umumnya masih bergantung melalui sumber daya manusia. Pada saat ini dalam budidaya kepiting cangkang lunak masih banyak terjadi kesalahan pada penjadwalan pemberian pakan dan juga tidak adanya pengontrolan pada setiap takaran pakan yang diberikan, padahal pakan kepiting merupakan faktor penting untuk proses pelepasan cangkang keras ke cangkang lunak kepiting. Metode yang dilakukan pada penelitian ini yaitu metode kuantitaf deduktif yang bersifat eksperimen. Dalam penelitian ini, waktu pemberian pakan hanya dilakukan 2 hari sekali menggunakan Real Time Clock (RTC) dan melakukan pemberian jumlah bobot pakan sebesar 5% dari berat badan tiap kepiting menggunakan Force Sensitive Resistor (FSR) Square yang berfungsi sebagai sensor berat. Penelitian ini menggunakan teknologi Internet of Things dengan output perangkat lunak berbasis website yang telah terintegrasi dengan Ethernet Shield pada Mikrokontroller. Hasil pengembangan pada penelitian ini, agar dapat memudahkan pengguna dalam budidaya kepiting cangkang lunak untuk meningkatkan keuntungan.

Computer Programming is one of the basic compulsory subjects for the electrical engineering field. This subject needs continuous practice so that it can be mastered well. This study aims to develop an interactive learning media based on Android so that students can practice anywhere. The interactive learning media for computer programming course takes in explanation of operator c++, input-output statement, program structure, data type, condition, repetition, string, and array, complemented with evaluation facility using the cosine similarity method so that the automated essay scoring feature is available. Interactive features provided in this learning media are the auto complete syntax and function in the code editor. For the evaluation used the black box testing method to test the functionally of the android application and the distribution of questionnaire to determine the response of students. The responses of student have proven that the level of practically of this interactive learning media is 87.5%.