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All Journal CYCLOTRON Journal of Welding Technology Jurnal Teknologi dan Riset Terapan (JATRA) Abdi Masya Jurnal Pengabdian kepada Masyarakat Politeknik Negeri Batam Proceeding Applied Business and Engineering Conference Jurnal Pendidikan Teknik Mesin
Domi Kamsyah
Politeknik Negeri Batam
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Tensile test and hardness test on FCAW-GS welding results of AB/EH36Z35 material in 3G downhill position Lubis, Robi Hardi; Gemala, Mega; Kamsyah, Domi; Fyona, Annisa; Saputra, Roni
Journal of Welding Technology Vol 6, No 1 (2024): June
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jowt.v6i1.5037

Abstract

Welding is a crucial aspect of the modern construction industry as it allows for efficient and reliable joining of metals. The purpose of this research is to evaluate the FCAW-GS welding process on AB/EH36Z35 material in the 3G downhill position. Additionally, the study aims to analyze the tensile and hardness test results of the welding. The research utilized the FCAW-GS welding method, with tensile testing conducted by the AWS D1.1/D1.1 M:2015 standard. Hardness testing was performed using the Vickers hardness test method with a test load of 10 Kgf, following the ASTM E92:2017 standard. The results of the tensile tests demonstrate that both specimens achieved high tensile strength. Furthermore, the hardness testing indicated no significant changes in material hardness in the HAZ and Line 3 areas. Consequently, this study's findings adhere to the quality standards outlined by AWS D1.1/D1.1M:2015 and ASTM E92:2017, making them a valuable reference for industrial welding processes
DESIGN AND PROTOTYPE DEVELOPMENT OF AN IOT-BASED TEMPERATURE AND HUMIDITY MONITORING SYSTEM WITH REAL-TIME DATA AND AUTOMATED ALERTS Wivanius, Nadhrah; Isranda Sihombing, Willy; Kamsyah, Domi
Jurnal Teknologi Dan Riset Terapan (JATRA) Vol. 7 No. 2 (2025): Jurnal Teknologi dan Riset Terapan (JATRA) - December 2025
Publisher : Politeknik Negeri Batam

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30871/jatra.v7i2.11679

Abstract

This study presents the design and implementation of an Internet of Things (IoT)-based system for real-time monitoring of room temperature and humidity. The system integrates a DHT11 sensor with an ESP32-C3-WROOM-2 microcontroller to measure environmental parameters within ranges of 0–50 °C and 20–90% relative humidity, achieving accuracies of ±2°C and ±5% RH, respectively. Measurement data are displayed on a 20×4 I2C LCD and transmitted wirelessly via Wi-Fi to Google Sheets for cloud-based storage and analysis. The system features an automatic notification mechanism that sends alerts through WhatsApp when environmental conditions exceed predefined thresholds. Calibration testing against the HTC-2 reference standard device demonstrated a total average measurement error of 1.594%, confirming compliance with the DHT11 sensors specified tolerance limits. Consistency tests conducted in both air-conditioned and non-air-conditioned environments revealed that the system effectively captures genuine environmental variations, with higher variability observed in mechanically controlled spaces due to HVAC operational cycles. The developed prototype successfully addresses limitations of conventional monitoring methods by eliminating manual intervention requirements, enabling continuous real-time surveillance, and facilitating rapid preventive actions. Results indicate that the system provides sufficient measurement accuracy and stability for practical applications in residential, commercial, and industrial environmental monitoring, while offering a cost-effective and accessible solution for IoT-based climate control systems.
IoT-Based Temperature and Humidity Monitoring System with Real-Time Data Transmission and Automatic Alert Mechanism Wivanius, Nadhrah; Isranda Sihombing, Willy; Kamsyah, Domi
CYCLOTRON Vol 9 No 01 (2026): CYCLOTRON
Publisher : Universitas Muhammadiyah Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30651/ct.v9i01.28964

Abstract

This study presents the design and implementation of an Internet of Things (IoT)-based system for real-time monitoring of room temperature and humidity. The system integrates a DHT11 sensor with an ESP32-C3-WROOM-2 microcontroller to measure environmental parameters within ranges of 0–50°C and 20–90% relative humidity, achieving accuracies of ±2°C and ±5% RH, respectively. Measurement data are displayed on a 20×4 I2C LCD and transmitted wirelessly via Wi-Fi to Google Sheets for cloud-based storage and analysis. The system features an automatic notification mechanism that sends alerts through WhatsApp when environmental conditions exceed predefined thresholds. Calibration testing against the HTC-2 reference standard device demonstrated a total average measurement error of 1.594%, confirming compliance with the DHT11 sensors specified tolerance limits. Consistency tests conducted in both air-conditioned and non-air-conditioned environments revealed that the system effectively captures genuine environmental variations, with higher variability observed in mechanically controlled spaces due to HVAC operational cycles. The developed prototype successfully addresses limitations of conventional monitoring methods by eliminating manual intervention requirements, enabling continuous real-time surveillance, and facilitating rapid preventive actions. Results indicate that the system provides sufficient measurement accuracy and stability for practical applications in residential, commercial, and industrial environmental monitoring, while offering a cost-effective and accessible solution for IoT-based climate control systems.
Co-Authors Abyad, Muliawan Nur Adhe Aryswan Adhitomo Wirawan Adi S.P Annisa Fyona Ari Kurniadi Ari Wibowo Ari Wibowo Aulia Fajrin Aulia Fajrin Baharudin, Budi Bambang Sahputra Budi Baharudin Dwi Budi Santoso Fajrin, Aulia Fedia Restu Freddy Pranata Hanifah Widiastuti Hendra Saputra Ihsan Saputra Irawan, Benny Haddli Isranda Sihombing, Willy Ita Wijayanti James Siregar Lalu Giat Juangsa Putra Lubis, Robi Hardi Mega Gemala Mufti Fathonah Muvariz Muhammad Ismail Mutiarani Mutiarani Mutiarani Nadhrah Wivanius Nadhrah Wivanius, Nadhrah Naufal Abdurrahman Prasetyo Nidia Yuniarsih Ninda H.B Novebriantika Nugroho Pratomo Ariyanto Nur Fitria Pujo Leksonowati Nurhuda, Yusuf Nurman Pamungkas Nurul Laili Arifin Nurul Ulfah Nurul Ulfah Perkasa, Veryawan Nanda Putro, Yogi Satrio Rahman Hakim Rahman Hakim Ramadhani , Hasan Fajriansyah Roni Saputra, Roni Rosbandrio, Wowo Sagoro, Gawan Saiful Arif Sapto Wiratno Satoto Saputra, Randy Siregar, James Widodo Widodo Widodo Widodo Widodo Wowo Rossbandrio