An understanding of the characteristics and parameters of ocean wavescan help to explan and develop the potential of ocean waves. One of the efforts thatcan be done in understanding the characteristics of ocean waves is to use a simulator of ocean waves. In this study, a laboratory scale ocean wave simulator was designed. This simulator is equipped with a wave generator system in the form of a DC motor and was developed with a size of 120 cm x 25 cm x 20 cm. The simulator performance test was carried out by varying the speed of theDC motor and the depth of the water to determine the effect on the parameters of the waves formed. The wave parameters measured are the height and the wavelength. The results show that the designed ocean wave simulator can produce waves that resemble a sinosuidal curve. The measured wave height on the simulator is directly proportional to the water depth. While the wavelengthis inversely proportional to the speed of the DC motor.Abstrak: Pemahaman mengenai karakteristik dan parameter gelombang laut dapat membantu dalam memahami dan mengembangkan potensi gelombang laut. Salah satu upaya yang dapat dilakukan dalam memahami karakteristik gelombang laut adalah dengan memanfaatkan simulator gelombang laut. Pada penelitian ini dilakukan rancang bangun simulator gelombang laut skala laboratorium.  Simulator ini dilengkapi dengan sistem pembangkit gelombang berupa motor DC dan dikembangkan dengan ukuran 120 cm x 25 cm x 20 cm. Pengujian performa simulator dilakukan dengan memvariasikan kecepatan motor DC dan kedalaman air untuk mengetahui pengaruhnya terhadap parameter gelombang yang terbentuk. Parameter gelombang yang diukur adalah tinggi dan panjang gelombang. Hasil penelitian menunjukkan simulator gelombang laut yang dirancang dapat menghasilkan gelombang yang menyerupai kurva sinosuidal. Tinggi gelombang yang terukur pada simulator berbanding lurus dengan kedalaman air. Sedangkan panjang gelombangnya berbanding terbalik dengan kecepatan motor DC.

Keeping an interaction distance between 1 to 2 m is one of the health protocols during the COVID-19 pandemic. This attempt was made to reduce the spread of the Coronavirus. On the other hand, this health protocol activity is often overlooked, whether intentionally or not. According to the mechanism of the Coronavirus spreading in the form of droplets that comes out during communication, sneezing, or coughing, maintaining distance can be the best effort to minimize the transmission of this virus. Therefore, the availability of a simple, accurate and user-friendly physical distancing alarm system could be a solution in the implementation of this health protocol. In this study, a prototype of a physical distancing alarm based on a distance sensor and a microcontroller in the form of an identity card was developed. Several steps are conducted in developing of this system, namely designing the instrumentation system and testing the performance of the system. System performance is tested through variations in the distance and angle of the objects. The measurement results show that the system can detect objects in front of the sensor up to a distance of 2.8m and an angle of  for a distance of 1m. The measurement using different angles of objects was performed for objects on the left and right sides of the sensor. In addition, a warning alarm will be on when the distance of the object exceeds the allowed distance.