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This research aims to design and develop a motion detection-based automatic light control system with a light intensity setting feature using IoT technology. The system utilizes a combination of PIR sensor, MOSFET module, and Arduino Uno microcontroller to control lighting based on the presence and position of the user. With an adaptive control algorithm, the lamp can dynamically adjust the lighting intensity to several levels as needed. Test results show that the system successfully reduces energy consumption optimally without reducing user comfort. The implementation of this technology has great potential in supporting energy efficiency in public areas, such as parks, office hallways, and sidewalks.

Freon is one of the refrigerants used in refrigeration systems. The refrigeration system has a very important role, namely to preserve food ingredients so that food can last longer. The use of freon is not only used in ships but is widely found in home appliances in refrigeration systems used in freezers, air conditioners, refrigerators, and dispensers. If more freon is used, the negative impact that arises is greater, namely the depletion of the ozone layer and global warming which can have a bad influence on health, the life of living things and the environment. The purpose of this researcher is to create a tool to reduce the negative impact of freon use, namely by using peltier as a cooling medium with environmentally friendly thermoelectric modules. This study uses trial and error methods. Where the trial process is carried out by turning on one of the working push buttons and observing the temperature value. Then it is processed by the control system, namely Arduino Mega which will later provide a PWM output signal to the IRF540 mosfet when the output temperature value is in line with the reference value and vice versa. The test of this tool was carried out by comparing measurements between the author's prototype tool and the standard measuring tool, namely the digital thermometer. Based on the test results, this device can produce a minimum temperature of 140C at 30-minute intervals without any media. The trial using 330ml bottled water can reach a temperature of 170C within 30 minutes in the cooler box. This tool is also equipped with an automatic monitoring system using a PWM signal in the form of a change in fan speed, which is 255 RPS maximum speed and when getting a PWM signal it changes to 50 RPS. The percentage of errors resulting from the comparison of standard measuring instruments and sensor values had the highest and lowest percentages of 2.37% and 0.84% in cold dispersion conditions without charge. Then the highest and lowest error percentages were 1.69% and 0.72% in the state of containing a load of 1 330ml mineral bottle. This ptototype uses data recording using Micro-SD as a data logger.

Salah satu cara paling umum untuk mengontrol kecepatan adalah dengan menggunakan sensor enkoder Data yang dihasilkan akan ditampilkan di komputer atau laptop Anda. Saya tahu pengamatan mereka. Semakin banyak motor memiliki biaya perawatan yang lebih rendah selain efisiensi, torsi, kecepatan dan variabilitas. motor DC ini memiliki proses pergantian yang lebih cepat dan biaya perawatan yang lebih rendah, yang menyebabkan sikat menjadi percikan api dan cepat menjadi rusak. Rotor terbuat dari kumparan dan diinduksi oleh medan magnet berputar stator, yang menyebabkan arus listrik di rotor. Kecepatan putaran rotor jauh lebih lambat daripada kecepatan putaran medan magnet stator. Akibatnya motor induksi cenderung kurang efisien dibandingkan motor DC kecepatan tinggi, bisa fluktuatif, dan biaya perawatannya lebih rendah, sehingga digunakan motor DC brushless atau biasa dikenal dengan motor BLDC.