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Journal : Global Advances in Science, Engineering

AIR QUALITY TEST OF CIGARETTE SMOKE IN COFFEE SHOPS IN SOUTH ACEH Erwinsyah Sipahutar; Rudi Arif Candra; Arie Budiansyah; Oktrison
Global Advances in Science, Engineering & Technology (GASET) Vol. 1 No. 1 (2025): Global Advances in Science, Engineering & Technology (GASET), Article Research
Publisher : Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/gaset.v1i1.61

Abstract

This study aims to analyze air quality in coffee shops in South Aceh using the MQ2 sensor to detect cigarette smoke. Cigarette smoke is a significant source of indoor air pollution and can negatively impact health. The MQ2 sensor was installed in various locations within the coffee shops to measure smoke concentration at different times, including peak and off-peak hours. The measurement results showed variations in cigarette smoke concentration, with peak levels occurring during times of increased customer traffic. Coffee shops with better ventilation systems exhibited lower smoke concentrations, indicating the importance of good air circulation in reducing the effects of cigarette smoke. These findings suggest the need for stricter regulations regarding smoking in public places and improvements in ventilation systems to protect the health of customers and staff. This research provides important insights into indoor air quality management and encourages the implementation of smoke-free policies in coffee shops. From the results of tests conducted in several coffee shops, it was found that the average cigarette smoke content increased in rooms with more than four fans, and that the size of the coffee shop had an influence.
DESIGN OF AN ARDUINO-BASED WATER UTILIZATION MONITORING SYSTEM FOR PUBLIC WATER SUPPLY COMPANIES Irana Dewi; Rudi Arif Candra; Erwinsyah Sipahutar; Arie Budiansyah
Global Advances in Science, Engineering & Technology (GASET) Vol. 1 No. 1 (2025): Global Advances in Science, Engineering & Technology (GASET), Article Research
Publisher : Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/gaset.v1i1.62

Abstract

This research presents the design and implementation of an Arduino-based water utilization monitoring system tailored for public water supply companies (PDAM) in Indonesia. The system integrates various sensors, including turbidity, pH, temperature, and electrical conductivity sensors, to effectively monitor water quality and usage in real-time. Utilizing an Arduino microcontroller as the central processing unit, the system automates data collection and processing, providing valuable insights into water conditions and consumption patterns. The incorporation of IoT technology and wireless communication modules enables remote monitoring and control, enhancing operational efficiency and user engagement. The device features a water flow sensor and a digital water meter, with data displayed on an LCD screen, allowing users to track their water consumption easily. Additionally, an alarm system alerts users when water usage approaches a predefined maximum limit, promoting water conservation. The findings indicate that the system operates effectively within specified flow rates, demonstrating its potential as a cost-effective solution for improving water management practices in public water supply sectors. Future enhancements may include internet-based monitoring capabilities and backup power solution This research presents the design and implementation of an Arduino-based water utilization monitoring system tailored for public water supply companies (PDAM) in Indonesia. The system integrates various sensors, including turbidity, pH, temperature, and electrical conductivity sensors, to effectively monitor water quality and usage in real-time. Utilizing an Arduino microcontroller as the central processing unit, the system automates data collection and processing, providing valuable insights into water conditions and consumption patterns.
Design and Implementation of a WiFi Manager System on the ESP8266 Module for IoT Applications Rahmatul Nisa; Eka Dodi Suryanto; Erwinsyah Sipahutar; Arie Budiansyah; Rudi Arif Candra
Global Advances in Science, Engineering & Technology (GASET) Vol. 1 No. 2 (2025): Global Advances in Science, Engineering & Technology (GASET), Article Research
Publisher : Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/gaset.v1i2.248

Abstract

The rapid growth of Internet of Things (IoT) technology has increased the demand for flexible and user-friendly wireless connectivity in embedded systems. One of the most widely used modules in IoT applications is the ESP8266, which integrates a microcontroller and WiFi capability in a compact and low-cost platform. Despite its advantages, WiFi configuration on the ESP8266 is commonly implemented using static credentials that are hardcoded into the firmware. This approach requires recompilation and reprogramming whenever network parameters change, making it inefficient and impractical for end users and large-scale deployment. This research proposes the design and implementation of a WiFi Manager system on the ESP8266 module to enable dynamic WiFi configuration without modifying the firmware. The proposed system allows the ESP8266 to automatically switch to Access Point (AP) mode when it fails to connect to a previously stored network. Users can then configure WiFi credentials through a web-based interface using a standard web browser. The configuration data are stored in non-volatile memory and used to reconnect the device in Station (STA) mode once a valid network is detected. The research methodology includes system design, firmware development using the Arduino platform, and functional testing to evaluate connectivity performance and reliability. Experimental results show that the WiFi Manager system successfully simplifies the WiFi configuration process, achieves a high connection success rate, and provides stable reconnection after power reset. The proposed approach enhances usability, deployment flexibility, and scalability of ESP8266-based IoT devices.
Design and Performance Analysis of a Low-Cost ESP32-Based NAT WiFi Repeater for Indoor IoT Networks Oktrison; Dirja Nur Ilham; Rudi Arif Candra; Erwinsyah Sipahutar
Global Advances in Science, Engineering & Technology (GASET) Vol. 1 No. 2 (2025): Global Advances in Science, Engineering & Technology (GASET), Article Research
Publisher : Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/gaset.v1i2.249

Abstract

The rapid proliferation of indoor Internet of Things (IoT) systems has intensified the need for cost-effective and energy-efficient wireless coverage extension solutions. Conventional commercial WiFi repeaters are often over-provisioned in terms of hardware capability and power consumption, making them unsuitable for small-scale IoT laboratories and energy-constrained environments. Although microcontroller-based platforms such as the ESP32 have been widely used for IoT gateways, their systematic evaluation as Network Address Translation (NAT)-based WiFi repeaters remains limited. This paper presents the design, implementation, and experimental performance evaluation of a low-cost ESP32-based NAT WiFi repeater for indoor IoT networks. The proposed architecture operates in dual-mode (Station + Access Point) configuration using a single 2.4 GHz radio interface and software-based NAT forwarding. Hardware optimization, including Bluetooth deactivation and transmission power tuning, is applied to reduce energy overhead. Experimental measurements conducted in an indoor laboratory environment evaluate throughput, latency, received signal strength indicator (RSSI), and power consumption. Results indicate that the proposed system achieves 15–35 Mbps throughput under single-client conditions, with an average latency increase of 3–8 ms compared to direct router connections. The repeater improves signal strength by up to 18 dB in weak-coverage areas, extending effective indoor coverage by approximately 10–20 m. Measured power consumption remains below 1.2 W during active forwarding, significantly lower than typical commercial repeaters. The main contribution of this work lies in providing a quantified energy–performance characterization of a microcontroller-based NAT repeater.
Power Efficiency Evaluation of Low-Cost IoT Repeater in Indoor Wireless Networks: Politeknik Aceh Selatan Campus Case Study Erwinsyah Sipahutar; Alfi Hafizh; Rial Fauza; Rudi Arif Candra
Global Advances in Science, Engineering & Technology (GASET) Vol. 1 No. 2 (2025): Global Advances in Science, Engineering & Technology (GASET), Article Research
Publisher : Politeknik Aceh Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62671/gaset.v1i2.252

Abstract

Low-cost Wi-Fi repeaters are increasingly deployed in smart campus environments to enhance indoor wireless coverage; however, their energy performance under realistic traffic conditions remains insufficiently quantified. This paper presents a comprehensive experimental evaluation of the power efficiency of an ESP8266-based IoT repeater operating in simultaneous Access Point and Station (AP+STA) mode over IEEE 802.11n (2.4 GHz). Unlike prior studies focusing primarily on protocol-level optimization or simulation-based relay models, this work provides hardware-level, real-time power characterization under controlled multi-client traffic scenarios. Experimental measurements demonstrate that average power consumption increases from 0.26 W (78 mA) in idle mode to 0.60 W (182 mA) with a single active client and up to 0.87 W (264 mA) under five-client high-load conditions. The maximum observed throughput reaches 18.4 Mbps, while energy per transmitted bit degrades from 0.032 µJ/bit to 0.047 µJ/bit as traffic intensity increases, revealing a measurable efficiency loss due to simultaneous packet reception and retransmission. A near-linear correlation (R² > 0.94) between traffic load and power consumption is identified, enabling the derivation of an empirical energy–performance model. The findings provide quantitative insight into the trade-off between coverage extension and energy demand in low-cost IoT repeaters. The proposed evaluation framework and empirical model support energy-aware deployment strategies for smart campus