Grain drying is a process to reduce grain moisture content to certain conditions, so the grain can last longer in storage. The grain dryer model used in this research was Indirect Type Solar Dryer (ITSD). In order to make this dryer can work at night, heating element that used electrical energy from solar panels was added. This energy is a renewable and environmentally friendly energy. This dryer was equipped with a temperature monitoring system and control of the photovoltaic heater. The results of temperature monitoring and voltage sensors to controlling photovoltaic heaters based on validation are categorized as work measurement tools, because they have an error of 0.5% – 2%. Whereas the relay works when the battery voltage is 11 - 10.9 V. This dryer can dry grain to reach a moisture content of 14.90% from initial moisture content of 48.46%. The drying process lasts for 11 hours, which is 7 hours using solar energy and 4 hours using photovoltaic heaters. The average temperature produced by dryer system during the drying process is 35.28 °C with a drying efficiency of 60.14%.
Mengetahui alat monitoring daya listrik berbasis smartphone yang telah dirancang memudahkan pengguna dalam memonitoring daya listrik. Metode yang dilakukan dalam proses pengambilan data yaitu metode eksperimen. Alat monitoring daya listrik bebasis smartphone inii dapat mengukur berapa daya yang terpakai dan dapat di pantau melalui aplikasi android. Alat monitoring daya listrik berbasis smartphone inii dapat memudahkan pengguna dalam memonitoring daya listrik dengan menggunakan aplikasi pada smartphone. Dilihat dari hasil tabel pengukuran cosphi beban, dengan mengambil sample data pengukuran mesin bor, rice cooker, solder, setrika dan mesin pompa Beban yang terukur pada mesin tersebut akan terhubung langsung dengan aplikasi dari smartphone. Aplikasi smarthphone ini bertujuan untuk memudahkan pengguna agar bisa memantau penggunaan daya listrik pada beban yang digunakan.
Dependence on power consumption (watts) of electricity at this time is very high, including the production processes in industry. The purpose of this study was to monitor power usage based arduino 3 phase and control power usage through the computer. This study used an experimental method to observe the results of current and voltage sensor readings. The design of the module uses a voltage sensor, a current sensor with type SCT 013 000 100A/1V, then fitted with the control microcontroller arduino uno R3, 4 channel relay module and display monitoring power usage of the Java programming language. The results of the monitoring module testing 3-phase electric power consumption is obtained percentage measurement error phase voltage R value of 0.48 %, S phase voltage values of 2.
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