In the cultivation of swallow nests, swallow breeders experience problems, especially in maintaining the temperature and humidity of the room in the wallet bird house. Swallow breeders must be able to maintain a stable temperature and humidity and maintain the safety of the swallow from owl pests. When the temperature is hot, the swallow room will become dry so that the nest becomes damaged and the swallow feels uncomfortable living in the nest. Based on this, a control and monitoring system for swallow nest cultivation based on Android was created. This system can help reduce the temperature and humidity in the swallow nest room using a dew machine that works automatically and the swallow room door can open/close automatically using an application on a smartphone. This system can work well if given a supply voltage of AC220V and DC12V. The dew machine will work (ON) if the temperature is above 29°C or the humidity is less than 70%. The sensor read data will be sent by the NodeMCU to the blynk server and displayed on the smartphone. The swallow room door can be opened or closed based on the light intensity value measured on the LDR sensor which is then sent to the NodeMCU to drive the motor driver and stepper motor. With this system, farmers are expected to be able to monitor and control the condition of swallow’s nests using the blynk application on smartphones in real time.
The fence is the main part of a house in terms of security. The conventional fence is opened and closed manually by the home owner. In rainy conditions this will be very ineffective and inefficient because the home owner has to get out of the vehicle to open the fence. This problem underlies the idea of making an automatic fence opening and closing system using a smartphone by utilizing Internet of Things (IoT) technology. Smartphone is useful as a NodeMCU controller contained in the ESP8266 WiFi module via an internet connection to connect to the blynk application. Relay is used as a switch that will command the motor to rotate when it gets a command from NodeMCU. Changes in relay conditions will cause the 12volt 200rpm DC motor to rotate, so the fence will move opened and closed. The movement of the servo motor also causes the turnstile to lock after the fence is closed. In order for the system to work properly, the revolutions per minute (RPM) of the motor requires a supply voltage of 12V. When the fence is opened, the motor speed is 53RPM. When closed, the motor speed is 49RPM. In the process of locking and opening the fence, the servo motor takes about 2 seconds.
Air merupakan salah satu sumber kehidupan yang sangat penting. Salah satu cara untuk melakukan penghematan air yaitu dengan memonitoring debit air yang dikonsumsi perbulannya. Pengukuran debit aliran diterapkan pada setiap rumah tangga yang menggunakan PDAM, sehingga setiap rumah dipasang meteran air, yang mana alat tersebut digunakan untuk mengukur atau mencatat seberapa besar volume air yang telah digunakan untuk keperluan setiap rumah tangga. Pengukuran besarnya volume air yang terdapat pada meteran air digunakan untuk penentuan jumlah tarif yang harus dibayar setiap rumah tangga kepada pihak PDAM setiap bulan pemakaian. Pada penelitian ini dibuat sistem yang dapat memonitoring kualitas dan penggunaan air PDAM. Pada sistem ini digunakan sensor turbidity yang akan mengukur tingkat kekeruhan air dalam satuan NTU. Nilai NTU ini akan menunjukkan kualitas air PDAM apakah layak untuk digunakan dalam kebutuhan sehari-hari atau tidak. Sensor water flow akan dipasang ditengah-tengah pipa PDAM, data debit aliran air yang terukur pada sensor akan diproses pada modul Arduino Uno untuk dikonversi menjadi data perkiraan biaya pengunaan air PDAM. Selanjutnya semua data akan ditampilkan pada LCD, yaitu data tingkat kekeruhan air, data besarnya debit air dan perkiraan biaya yang harus dibayar oleh pelanggan. Semua data akan dikirimkan ke server blynk melalui Camera ESP32. Data yang tersimpan pada server dapat diakses menggunakan aplikasi blynk pada smartphone. Selain itu data juga akan tersimpan pada SD Card sebagai back up data. Hasil pembacaan sensor turbidity menunjukkan nilai kekeruhan air sebesar 5 NTU. Nilai eror dari hasil pembacaan sensor water flow sebesar 1,6% yang artinya tingkat akurasinya sebesar 98,4%. Sedangkan data hasil pembacaan sistem penghitung biaya penggunaan air PDAM tidak terdapat eror sehingga akurasi datanya mencapai 100%.
Branching transformers are transformers located at the branching of the Medium Voltage (TM) network. The output from this transformer will be forwarded to the homes of the public/PLN customers. The loss of voltage in the branching transformer due to a disturbance in the electricity network cannot be known by PLN officers before receiving a report from the public, so the duration of the blackout is very long. This is certainly very detrimental to the community and PLN. Voltage Loss Detector is designed to detect loss/ready voltage on branching transformers. This tool uses a ZMPT101B voltage sensor to detect voltage, an Arduino uno microcontroller and a GSM SIM800L module to send messages. After testing, this tool successfully sends a message when the voltage is ready/loss. The voltage values read by the ZMPT101B sensor on the R, S and T phases are 223.36 volts, 222.02 volts and 220.18 volts, while the voltage using a multimeter measuring instrument is 223 volts, 222 volts and 220 volts. The highest time Delay in receiving messages in the room is 20 seconds. The highest time Delay in receiving messages outdoors is 15 seconds. The signal quality of the GSM SIM800L module will affect the Delay in receiving messages. With this tool, power outages in branching transformers will be immediately noticed by PLN officers for follow-up.
Hydroponic system requires continuous circulation of water to grow plants. To prevent the risk of stopping the circulation of this water, another source of electrical energy is used to backup power sources if there is a blackout at PLN. So, in this research Automatic Transfer Switch (ATS) system was designed in Hydroponics to maintain water circulation. In which this ATS has a contractor that two power sources that can flow and cut off electric current, which is also connected to the MK2P Relay as an inverter switch, and the MCB as a component protector. The backup power source is used by PLTS connected to the inverter, where the inverter is supplied by a battery that is charged by solar panels as a backup power source. The results of this design show that the transfer delay from PLN to PLTS for about 1,52 seconds and PLTS to PLN is 5.40 seconds. The delay is caused by TDR delay set for about 5 seconds to connected to PLN. As well as the reliability that results form this system is also balanced and can provide electric voltage u to 100% performance with experiments using different delays such as 1, 2, 3, 4, and 5 seconds for 10 trials which can turn on a maintain water circulation on hydroponics.
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