Abstract
Water, in any way it comes, is important for the life of all living things. Indonesia is an area of tropical equatorial with a variation of rain, which is quite high. The regularity of the distribution of rainfall is one of the aspects most important to the activity of the community. As the development of technology, the intensity of rainfall can be measured manually using Ombrometer Observatory tool. The manual tool for measuring the rain precipitation, Ombrometer Observatorium, is used to take data manually. Samples should be taken at 7.00 a.m. everyday using a measuring cup to know the height of the water contained. However, the type is prone to error at the high rainfall intensity, since the drainage of the samples is conducted every 24 hours. Therefore, much water is wasted. To solve the problem, a modification of a rainfall gauge was made, that is Ombrometer Observatory with ultrasonic sensor HC-SR04. The height of the water in the container is sent through a server of which the data is stored in the database every ten minutes to reduce the risk of evaporation. It also minimizes the error in measuring the rainfall intensity. The results have been compared to the ones by BMKG (Meteorology, Climatology, and Geophysics Agency). The correlation value of the measurement ratio reached 0.9739 or 97.39%.
Highlights
Water plays significant role for the life of all living things on earth
In the event of rain with high intensity, this type of manual tool cannot collect rainwater, because of the overflowing water in the cup. This condition will hamper the process of measuring rainfall if there is more than one rain event in a day, keeping in mind that the data collection and drainage of the container in the Observatory Ombrometer type rainfall gauge is only conducted every 24 hours at 07.00 am. The solution to this problem is the manufacture of a manual rainfall gauge Ombrometer Observatory using the HCSR04 ultrasonic sensor that will change the data collection automatically without using a measuring cup
The HC-SR04 ultrasonic sensor is connected to Arduino to find out the range of water level held in the rain gauge
Summary
Water plays significant role for the life of all living things on earth. Water is the essence of life and essential nutrients for humans, animals, plants, and the environment [1]. In the event of rain with high intensity, this type of manual tool cannot collect rainwater, because of the overflowing water in the cup This condition will hamper the process of measuring rainfall if there is more than one rain event in a day, keeping in mind that the data collection and drainage of the container in the Observatory Ombrometer type rainfall gauge is only conducted every 24 hours at 07.00 am. The solution to this problem is the manufacture of a manual rainfall gauge Ombrometer Observatory using the HCSR04 ultrasonic sensor that will change the data collection automatically without using a measuring cup. Drain on the container is carried out at a height of 10 cm or 100 mm because it is adjusted to the maximum range in the value of low rainfall intensity, between 0 mm - 100 mm
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