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All Journal Jurnal Otomasi Kontrol dan Instrumentasi
Siahan, Daniel Fernando
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Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Engineering Industrial & Manufacturing Engineering

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Pengembangan Alat Portabel Pengukur Kadar Air dan Suhu Biji Kopi Berbasis ESP32 dengan Sensor Kapasitif dan Penyimpanan Data Real-Time Rohman, Ardianto Syaifur; Nari, Mochamad Irwan; Siahan, Daniel Fernando; Jamil, Mursit; Kurniawan, Atalarick Dwi Novial; Dwianto, Sihmaulana; Genarsih, Tunjung; Asmono, Sepdian Luri
Jurnal Otomasi Kontrol dan Instrumentasi Vol 17 No 2 (2025): Jurnal Otomasi Kontrol dan Instrumentasi
Publisher : Pusat Teknologi Instrumentasi dan Otomasi (PTIO) - Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/joki.2025.17.2.12

Abstract

The primary quality indicator of coffee beans is determined by their moisture content. This study aims to develop a portable prototype device for measuring both the moisture content and temperature of coffee beans, utilizing an ESP32 microcontroller integrated with a Capacitive Soil Moisture Sensor v1.0 and an SHT21 sensor. The device is designed to provide accurate and efficient measurements, with results displayed in real time on an OLED screen. In addition, the system stores measurement data on an SD card for further analysis. Experimental testing was conducted five times for each sample, comparing the results of the prototype with reference instruments, namely the YL-69 sensor for moisture measurement and a digital thermometer for temperature measurement. The results demonstrated that the device achieved a high level of accuracy, with an average relative error of 1.05% for moisture content and 0.91% for temperature. Furthermore, the prototype was proven to be portable and energy-efficient, consuming 7.7 Wh over 1.1 hours of operation, as evaluated through battery-based performance testing until full discharge. With its integrated data storage and real-time monitoring capabilities, this device provides a practical solution for coffee farmers and processors in maintaining and ensuring the quality of coffee beans.
Co-Authors Dwianto, Sihmaulana Jamil, Mursit Kurniawan, Atalarick Dwi Novial Nari, Mochamad Irwan Rohman, Ardianto Syaifur Tunjung Genarsih, Tunjung