The handling of hazardous chemicals, such as sulfuric acid (H₂SO₄), in industrial processes requires a control system that ensures both operational reliability and safety. Manual pump operation in such contexts carries a significant risk of over-pumping, leaks, and exposure, which can lead to environmental contamination and safety hazards. To address this issue, this study focuses on the design and implementation of an automatic pump control system prototype using the Arduino Mega 2560 microcontroller. The system integrates three key sensors: a float switch for basic level detection, an ultrasonic sensor (HC-SR04) for precise liquid level measurement, and a water flow sensor (YF-S201) for monitoring flow rate. The prototype is programmed to automatically regulate pump operation based on real-time input from the sensors. When the liquid level reaches a predetermined threshold, the pump activates or deactivates accordingly. Sensor data, including fluid height and flow rate, are displayed in real-time on a 3.5-inch TFT LCD, allowing for direct operator monitoring. Both the hardware configuration and software algorithms were tested for functionality, response time, and accuracy under simulated industrial conditions. The results indicate that the system can reliably control pump activation with minimal error rates. The ultrasonic sensor demonstrated an average measurement error of 0.94%, while the water flow sensor achieved an error rate of 1.19%. The software successfully processed sensor data and executed output actions consistent with the programmed logic. Overall, this automated control system proved effective in mitigating the risk of over-pumping and improving safety in handling hazardous chemical fluids. Given its accuracy, reliability, and cost-effectiveness, the developed prototype is considered suitable for small- to medium-scale industrial applications, with potential for further refinement to meet larger operational demands.

The HKBP Palmarum Church faces significant challenges in its administration and financial management, which have been conducted manually. This approach exposes the system to risks of data loss, delays in information updates, and a lack of transparency in financial reporting. This community service project aims to develop a web-based management information system to address these issues. The methodology employed is the Software Development Life Cycle (SDLC) with a prototyping approach. The outcome of the project includes a system capable of managing congregation data, finances, and service information digitally. With the implementation of this system, church services are expected to become more efficient, transparent, and serve as a model for other churches.

Non-communicable diseases (NCDs) such as hypertension, diabetes, and dyslipidemia are major global health challenges that contribute to high morbidity and mortality rates. Unhealthy lifestyles, including poor diet, lack of physical activity, and high-stress levels, are key risk factors for NCDs. Early detection through regular screening is essential to prevent complications and improve public health. This community service program aimed to conduct health screenings by measuring blood pressure, blood glucose levels, and cholesterol levels among adults of productive age in West Jakarta. The program also included health education sessions to raise awareness about NCD risk factors and the importance of a healthy lifestyle. Participants underwent blood pressure measurements, random blood glucose tests, and total cholesterol assessments, followed by health counseling and lifestyle modification recommendations. The results emphasized the need for routine health monitoring and preventive interventions to reduce the burden of NCDs in the community.

Nutritional problems in preschool children in Indonesia, including in Botumoito Village, Botumoito Sub-district, Boalemo District, are a major concern in an effort to improve the quality of public health. One of the solutions offered is the utilisation of Moringa (Moringa oleifera), which is rich in nutrients such as vitamins, minerals and protein. This training activity aims to improve the knowledge and skills of the community, especially mothers, in processing moringa into healthy snacks for preschool children. The training method includes an understanding of the nutritional content of moringa, moringa-based food processing techniques, as well as how to present it attractively to children. The results of this training are expected to improve the nutritional status of preschool children through better quality food intake and open economic opportunities for the community through the production and sale of moringa-based snacks. The programme is also expected to have a sustainable positive impact on improving family welfare and children's health in the area.

Rosella is known to have many health benefits, such as boosting the immune system and regulating blood pressure. Based on a situation analysis, the lack of knowledge among students regarding the rosella plant is due to the absence of rosella plants in the school area. Additionally, there has never been a workshop at SDN Tlogosari Wetan 02 Semarang related to educating students about the use of rosella flower petals as a health tea by any party. The community service activity began with an introduction to the rosella plant to the students, followed by education on the use of herbal plants that contain antioxidants, in this case, the rosella flower. After that, the activity continued with training that involved the students in the process of making rosella tea. The results of this activity showed an increase in the students' knowledge about the importance of a healthy lifestyle and the students' skills in utilizing natural materials (rosella flower petals) to make health tea.

In an effort to create a safe and productive work environment, the Behavior Based Safety (BBS) approach has become one of the main strategies in occupational safety management, especially in high-risk industries such as logistics. This study aims to evaluate the effectiveness of the implementation of the Behavior Based Safety (BBS) method in shaping the safe behavior of workers at PT XYZ, a logistics company in Balikpapan. The BBS method is an occupational safety approach that focuses on individual behavior in preventing work accidents. This study uses a qualitative method with a descriptive approach through direct observation and interviews with management and workers. The results of the study indicate that the implementation of BBS at PT XYZ has not been running optimally. Some of the main obstacles found include the lack of standard operating procedures (SOPs), lack of occupational safety training, weak communication between management and workers, and minimal involvement of workers in a safety culture. Although there is a commitment from management, improvements are still needed in the aspects of socializing safety policies, providing written documents, and ongoing training to build a safe and sustainable work culture.

Drug abuse is a serious threat that impacts social stability and public health. This study aims to analyze the forms of community participation in the Prevention and Eradication of Drug Abuse and Illegal Drug Trafficking (P4GN) program, particularly in the RT.05 Pondok Bambu area of East Jakarta. The approach used is a qualitative approach with methods of interviews, observation, and documentation. Informants consist of representatives from the National Narcotics Agency (BNN RI), community leaders, and local residents selected through purposive sampling. The results of the study indicate that community participation in the decision-making dimension remains low, participation in implementation is incidental, while the benefits of P4GN efforts are beginning to be felt in the form of increased awareness and environmental safety. Community evaluation is conducted informally but has the potential to be developed further. This study emphasizes that the success of the P4GN program heavily depends on strong partnerships between the community and relevant institutions, as well as the need for strengthened education, training, and more systematic participation opportunities.

Work accidents are incidents in the workplace that can cause injury, work-related illnesses, or death. Work accidents can occur in every sector, one of which is in the UMKM (Micro, Small and Medium Enterprises) industry. One of the UMKMs in RW 02 Meranti Pandak is Azka Sala Lauak, which is included in the fried food business. Work accidents that can occur in this business are burns due to hot oil splashes, slipping due to slippery floors and gas explosions. This activity aims to increase workers' knowledge regarding the prevention and handling of work accidents in UMKM Sala Lauak. The method used in this counseling is lectures. From the results of the counseling, it was found that workers' knowledge increased about the prevention and handling of work accidents in UMKM Sala Lauak from 9.80 to 13.07. It can be concluded that the counseling carried out was effective because there was an increase in participants' knowledge about the prevention and handling of work accidents in UMKM Sala Lauak.

The problem that often arises now is the increase in living costs while income remains constant. With empty land in the household that is not being utilized optimally, this should be an opportunity for housewives to help improve the household economy. One solution to utilize this empty land is through hydroponic plants. This hydroponic plant uses organic fertilizer so that the hydroponic plant is good for family consumption and distribution in supermarkets. By utilizing hydroponic plants, housewives can help improve the family's economy so that the family's needs can be fully met. In this research, the researcher conducted an interview with one of the housewives who had used her yard through hydroponic plants that she had developed herself since 2017. The aim of the research was to determine the economic improvement experienced by housewives after using the hydroponic system.

Vitamin D deficiency is a condition that often goes unnoticed but has widespread health implications, particularly among the adult population. Through this community service activity, vitamin D levels were screened in 49 adult participants in the Danau Sunter area using serum 25(OH)D testing, accompanied by education on the importance of vitamin D, its natural sources, and strategies for preventing deficiency. The results showed variation in vitamin D levels among participants, with a mean of 59.13 ng/mL and a range of 26.6–91.8 ng/mL. A total of 3 participants (6.12%) were found to have vitamin D deficiency. Several individuals were identified as being in the deficiency category, requiring further intervention. The educational component played an important role in increasing participants’ awareness and understanding of the role of vitamin D in preventing musculoskeletal and metabolic complications. This program successfully identified individuals in the community with vitamin D deficiency and improved knowledge regarding its prevention.
 
Keywords: Early Detection, Deficiency, Vitamin D