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Domi Kamsyah
Politeknik Negeri Batam
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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.
STUDI KERUSAKAN MESIN WHEEL LOADER LIUGONG ZL50CN MENGGUNAKAN FMEA DAN DIAGRAM FISHBONE Domi Kamsyah; Hasan Fajriansyah Ramadhani; Nur Fitria Pujo Leksonowati; Nadhrah Wivanius
Jurnal Pendidikan Teknik Mesin Vol. 12 No. 1 (2025): Jurnal Pendidikan Teknik Mesin
Publisher : Program Studi Pendidikan Teknik Mesin Fakultas Keguruan dan Ilmu Pendidikan Universitas Sriwiajaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36706/jptm.v12i1.77

Abstract

Power system merupakan sistem yang memberikan tenaga agar wheel loader dapat beroperasi dan merupakan sumber penggerak utama bagi sistem atau komponen lainnya. Kegagalan fungsi pada power system mengganggu kerja sistem lain yang dapat berdampak kepada penurunan produktivitas, downtime, dan biaya perbaikan yang tinggi. Penelitian ini dilakukan untuk mencari tahu penyebab kegagalan power system dari wheel loader Liugong ZL50CN, dengan cara mengidentifikasi kemungkinan kegagalan dengan menggunakan metode FMEA dan dilanjutkan menggunakan diagram fishbone untuk melihat penyebab kegagalan. Hasil analis menunjukkan bahwa penyebab utama penyebab kerusakan pada mesin wheel loader ZL50CN dalam kurun waktu Januari 2021 sampai Desember 2023 adalah kerusakan sistem pendingin mesin. Hasil FMEA membuktikan bahwa modus kegagalan kerusakan sistem pendingin mesin memiliki nilai RPN tertinggi yaitu sebesar 243. Digram fishbone merinci penyebab apa saja yang membuat modus kegagalan kerusakan sistem pendingin mesin yang terdiri dari 4 faktor utama yaitu mechine, material, man, dan metode. Kata kunci: FMEA, Digram fishbone, RPN
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 Hasan Fajriansyah Ramadhani 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 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 Putro, Yogi Satrio Rahman Hakim Rahman Hakim Roni Saputra, Roni Rosbandrio, Wowo Sagoro, Gawan Saiful Arif Sapto Wiratno Satoto Saputra, Randy Siregar, James Veryawan Nanda Perkasa Widodo Widodo Widodo Widodo Widodo Wowo Rossbandrio