The quality and the temperature of pond water is an important parameter that need to get attention in fish cultivation. Every type of fish has their own characteristic towards water condition and pond temperature. The monitoring of water quality in cultivation pond is done manually and it takes a lot of time. The purpose of this research is to design web-based control system device and monitoring the quality of the water of fish cultivation pond including salinity, temperature and the hardness in real time using special application. This device design consists of salinity sensor, hardness sensor, and temperature sensor. Temperature can be controlled and monitored automatically on the application via computer/laptop. The result of this research is temperature drop by 0,1 oC on a 10 liters pond that takes 18 seconds, and to decrease the temperature of 1 oC takes 180 seconds (3 minutes). To raise the temperature of 0,1 oC takes 264 seconds or 4,4 minutes, and to raise the temperature of 1 oC takes 2640 seconds or 44 minutes. The percentage of error for sensor reading is ranged 2,4% - 3,9%.
Water content is the water content contained in the material and expressed in units of percent. Water content can affect the texture of fish and cause the development of bacteria in fish. In general, people only know the process of drying fish by looking at the texture of the fish while the water content found in fish is in accordance with the Indonesian National Standard (SNI), which is 40%. The purpose of drying fish is by controlling the water content so that the fish can be dried in accordance with the Indonesian National Standard (SNI). The control system contained in this device uses a DS18B20 temperature sensor, loadcell sensor, relay, heating element, and cooling fan. The working principle of this device uses a heating element to reduce the water content or load on the fish and the cooling fan to remove the hot temperature from the cabinet which is controlled by a relay to regulate the temperature. The heater will be active when the temperature is less than 60°C and the cooling fan is not active, when the temperature is more than 60°C. The device will automatically stop the heater when the load value is smaller or equal to the value of the set point. Reduction of water content up to 40% according to the Indonesian National Standard (SNI) with a 250g fish load takes 1 hour 43 minutes, a 500g fish load for 3 hours 17 minutes, and a 1000kg fish load for 6 hours 25 minutes. Keywords— Arduino Mega 2560, DS18B20, loadcell, keypad.
Palka ikan muatan hidup saat ini tidak mampu mengontrol parameter pH air sesuai dengan lingkungan hidup ikan. pH perlu diperhatikan agar ikan dapat bertahan hidup. Tujuan dari penelitian ini adalah merancang bangun sistem yang dapat mengontrol ph air pada palka ikan menggunakan mikrokontroler dan LabVIEW. Pengujian dilakukan pada palka dengan dimensi 90 cm x 65 cm x 50 cm. Monitoring perubahan nilai pH secara real time dilakukan melalui LCD dan LabVIEW. Perangkat ini dilengkapi dengan indikator LED yang dapat mengindikasikan kondisi dari relay diluar dari perangkat lunak LaBVIEW. Selisih pembacaan sensor yang dirancang dengan alat ukur standar hanya berkisar 0,05. Proses penampilan nilai pembacaan sensor pada LCD dan LabVIEW berjalan baik dengan waktu respon pembacaan sekitar 0,5 detik dan dengan respon waktu dalam mengendalikan relay sekitar 0,3 detik. Ikan dapat bertahan hidup dengan menggunakan sistem kontrol yang dirancang selama proses pengujian dalam waktu 2x24 jam. Nilai pembacaan dari sensor akan tersimpan secara real time selama perangkat lunak LabVIEW berjalan.
One of the factors that caused the ship accident because the amount of passengers on the ship exceeded capacity. The absence of a device directly used on the ship's door to counter the amount of passengers is the cause of the excess capacity of passengers on the ship. The purpose of this study is to counter the amount of passengers on commercial vessels either entering or exiting the same door and controlling the excess amount of passengers. This passenger counter device uses two IR Obstacle sensors which function to detect and count the amount of passengers entering and exiting on the ship. The sensor reading distance is 0.1 cm to 56 cm. The result of IR Obstacle sensor reading as a passenger detector will be processed using a mini computer Arduino uno displayed on the LCD as the amount of passengers. This device is equipped with LED indicators to indicate the amount of passengers on the ship. For the condition the amount of passengers exceeds the capacity then the alarm will be active and the ship starter can not be activated and for normal amount of passengers the alarm is off and the ship engine stater can be activated.
Activities carried out in coastal areas such as recreation, fishing activities, and transportation makes coastal regions have an essential role in life. However, activities carried out in the region often leave negative impacts, such as dumping trash directly into the sea. Coastal communities still carry out their activities to dispose of their waste now to the sea. The process of cleaning up marine litter in the coastal areas using heavy equipment is quite tricky. This is because the condition of buildings in the coastal area has the building with the concept of houses on stilts. The research has succeeded in making a marine garbage dredging using a conveyor system that is contained using a wireless joystick and can be well controlled within a radius of about 7 meters. The dredging is also equipped with a weight sensor (load cell) used to determine the load of garbage displayed on the 16 x 2 LCD. Garbage weight is stored in the SD card. The data stored on the SD card will show the time and load of garbage that has been transported by conveyor in an area.
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